II PUC (MATHEMATICS) ANNUAL MODEL QUESTION PAPER FOR ALL SCIENCE STUDENTS WHO...Bagalkot
ย
My dear Students,
Wishing you all happy SHIVRATRI. & ALL THE BEST IN YOUR ANNUAL EXAMS-2014
Here I have uploaded II- P.U.C MATHEMATICS MODEL QUESTION PAPER FOR the year 2014 Which i have designed according to New syllabus of CBSE. I hope this model paper will be helpful to all the students who are writing annual exams on 18-March-2014.
wish you all the best
Regards,
A. NAGARAJ
Director-Faculty
Shree Susheela Tutorials
BAGALKOT-587101
mob: 9845222682
II PUC (MATHEMATICS) ANNUAL MODEL QUESTION PAPER FOR ALL SCIENCE STUDENTS WHO...Bagalkot
ย
My dear Students,
Wishing you all happy SHIVRATRI. & ALL THE BEST IN YOUR ANNUAL EXAMS-2014
Here I have uploaded II- P.U.C MATHEMATICS MODEL QUESTION PAPER FOR the year 2014 Which i have designed according to New syllabus of CBSE. I hope this model paper will be helpful to all the students who are writing annual exams on 18-March-2014.
wish you all the best
Regards,
A. NAGARAJ
Director-Faculty
Shree Susheela Tutorials
BAGALKOT-587101
mob: 9845222682
The pattern of question paper in the subject Mathematics has been changed in CBSE,India.I am uploading the paper with marking scheme so that students will be benefitted-Pratima Nayak,KVS
This is a 3 hour sample paper for cbse class 12 board exam. This covers all chapters of ncert 12th math book. For more such papers visit clay6.com/papers/.
The pattern of question paper in the subject Mathematics has been changed in CBSE,India.I am uploading the paper with marking scheme so that students will be benefitted-Pratima Nayak,KVS
This is a 3 hour sample paper for cbse class 12 board exam. This covers all chapters of ncert 12th math book. For more such papers visit clay6.com/papers/.
Regression analysis is a mathematical measure of the average relationship between two or more variables in terms of the original units of the data.
In regression analysis there are two types of variables. The variable whose value is influenced or is to be predicted is called dependent variable and the variable which influences the values or is used for prediction, is called independent variable.
In regression analysis independent variable is also known as regressor or predictor or explanatory variable while the dependent variable is also known as regressed or explained variable.
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Hanโs Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insiderโs LMA Course, this piece examines the courseโs effects via a variety of Tim Han LMA course reviews and Success Insider comments.
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasnโt one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
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Francesca Gottschalk from the OECDโs Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
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It is possible to hide or invisible some fields in odoo. Commonly using โinvisibleโ attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
1. Unsolved practice paper โ 1
Section A
1. Fine the value (s) of x for which the matrix A = [
๐ ๐ ๐
๐ ๐ ๐
๐ โ๐ ๐
] is singular .
2. Given โซ ๐ ๐
( tan x + 1 ) sec x dx = ๐ ๐
๏ฆ (x) + c. Fine ๏ฆ (x).
3. Let A = { 1,2,3,} . The relation R on set A is defined as R = { ( 1,2 ), (1,3 ), (1,3) } . Check whether R is
reflexive or not.
4. Evaluate : cos [๐ ๐ฌ๐ข๐งโ๐ ๐
๐
] .
5. If a vector has direction angles 90o , 60o and 30o , then fine its direction cosines.
6. Evaluate the integral : โซ
๐
๐+ ๐ ๐
โ๐
๐
dx.
Section B
7. Evaluate :- โซ
๐ ๐
+ ๐
(๐โ๐) ๐ ( ๐+๐)
dx.
8. Differentiate the following w.r.t. x: ๐๐จ๐ญโ๐
[
โ๐+ ๐ ๐
+ โ๐โ ๐ ๐
โ๐+ ๐ ๐ โ โ๐โ ๐ ๐ ] .
9. A bag contains 2 white, 3 red and 4 blue balls . Two balls are drawn from the bag. Fine the
probability distributions of the number of white balls.
OR
A random variable X has the following probability distribution:
X 0 1 2 3 4 5 6 7
P(X) 0 K 2k 2k 3k k2
2k2
7k2
+ k
Determine (i) k. (ii) P (X < 3 ) . (iii) P (X > 6 ) (iv) P (0 < X < 3 ) .
10. Fine inverse of the matrix [
๐ โ๐
โ๐ ๐
] by using Elementary Row Transformation.
11. If x = tan (
๐
๐
๐๐๐ ๐ ) . Then prove that (1+ x2)
๐ ๐
๐
๐ ๐ ๐ + ( ๐๐ โ ๐)
๐ ๐
๐ ๐
= ๐ .
OR
If y = 500e7x + 600 e-7x , then prove that
๐ ๐
๐
๐ ๐ ๐ = 49 y.
12. Proved that |
๐ + ๐ + ๐ โ๐ โ๐
โ๐ ๐ + ๐ + ๐ โ๐
โ๐ โ๐ ๐ + ๐ + ๐
| = ๐( ๐ + ๐)( ๐+ ๐)(๐ + ๐) .
13. Let A be the set of all 50 student of class XII in a central school. Let ๏ฆ : A โ N be a function , defined
by ๏ฆ (x) = Roll number of student x. Show that ๏ฆ is one โ one but not onto . All the students of this
2. class are participating in โSAVE ENVIRONMENTโ camping . Would you like to be a part of campaign ?
Why ?
14. Using differentials, find the approximate value of the following :
๐
(๐๐)
๐
๐
.
15. Evaluate : โซ
๐
๐๐๐ ( ๐โ๐) ๐๐๐ (๐โ๐)
dx.
16. If A- 1 =
๐
๐
[
๐ โ๐
๐ ๐
] ๐๐๐ ๐ฉ = [
๐ ๐
๐ ๐
] , then find (AB)-1 .
17. Solve the differential equation 2x2 ๐ ๐
๐ ๐
- 2xy + y2 = 0.
OR
Solve the differential equation tan y
๐ ๐
๐ ๐
= cos (x + y) + cos (x โ y).
18. If ๐โโ , ๐โโ , ๐โ are three vectors such that ๐โโ ๏ด ๐โโ = ๐โ , ๐โโ ๏ด ๐โ = ๐โโ , prove that ๐โโ , ๐โโ , ๐โ are mutually
perpendicular to each other with ๏ช๐โโ ๏ช= 1 and | ๐โโ | = | ๐โ | .
19. Solve: tan-1 (2x) + tan-1 (3x) = n๏ฐ +
๐๐
๐
, where n ๏ Z.
OR
Solve : sin-1 ( 6โ ๐ x ) + sin-1 (6x) =
๐
๐
.
Section - C
20. Fine the equation of the plane passing through the point ( 1, 1, 0, ) , ( 1, 2, 1 ) and (-2, 2, -1 ) .
21. Evaluate : โซ |๐ ๐
โ ๐|
๐
โ๐
dx.
22. Find the area enclosed between the parabola y2 = 4ax and the line y = mx.
OR
Find the area bounded by the curves y = x and y = x3 .
23. If product of distances of the point (1, 1, 1 ) from origin and plane ๐โ . (๐ฬ โ ๐ฬ + ๐ฬ ) = -p be 8 , then
find the value (s) of p.
24. A manufacturer of patent medicines is preparing a production plan for medicines M1 and M2 . There
is sufficient raw material available to fill 20000 bottles of M1 and 40000 bottles of M2 . But there
are only 45000 bottles in to which either of the medicines can be put . Further, It takes 3 hours to
prepare enough material to fill 1000 bottles of M1 and 1 hour to prepare enough material to fill
1000 bottles of M2 . There are 66 house available for this operation . The profit is Rs. 8 per bottle
for M1 and Rs.7 per bottle for M2 . How should the manufacturer schedule his production in order
to maximise his profit ? Formulate the above L.P.P. mathematically and then solve it graphical.
25. Suppose the reliability of an HIV test is specified as follows: Among people having HIV , 90% of the
tests dated the disease but 10% fail to do so. Among people not having HIV , 99%of the tests show
3. HIV โ ive but 1% are diagnosed as HIV + ive . From a large population of which only 0.1% have HIV ,
one person is selected at random at random for an HIV test, and the pathologist reports him/her as
HIV + ive . what is the probability that the person actually has HIV ?
OR
For three persons A, B and C, the chances of being selected as a manager of a firm are in the ration
4 : 1 : 2 respectively . the respective probability for them tointroduce a radical change in marketing
strategy are 0.3, 0.8, and 0.5. if the change takes place , find the probability that it is due to the
appointment of B.
26. Show that the volume of the greatest cylinderthat can be inscribed in a given cone of height h and
semi โ vertical angle ๏ก is
๐
๐๐
๏ฐ h3 tan2 ๏ก.
ANSWERS
1. -3 2. sec 3. no 4. ยฝ 5. 0, ยฝ,
โ๐
๐
6.
๐
๐๐
7.
๐
๐
log | ๐ โ ๐|-
๐
๐(๐โ๐)
+
๐
๐
๐๐๐ | ๐ + ๐| + ๐ช 8.
๐๐ ๐โ๐
๐ โ ๐โ ๐ ๐๐
9.
X 0 1 2
P(X) ๐๐
๐๐
๐๐
๐๐
๐
๐๐
OR
(i)
๐
๐๐
(ii)
๐
๐๐
(iii)
๐
๐๐๐
(iv)
๐
๐๐
10. [
โ
๐
๐๐
โ
๐
๐
โ
๐
๐
๐
]
13. Yes , I would like to be a part of this camping because healthy environment will improve the
quality of our lives.
14. 0.4969 15. cosec (b โ a ) log |
๐๐๐ (๐โ๐)
๐๐๐ (๐โ๐)
| + C
16. โ
๐
๐๐
[
๐ โ๐๐
โ๐ ๐
] 17 . โ
๐๐
๐
+ ๐๐๐ | ๐| + ๐ช OR sec y = 2 sin x +c
19. โ
๐
๐
OR
๐
๐๐
20. -2x โ 3y + 3z + 5 = 0 21.
๐๐
๐
22.
๐ ๐ ๐
๐๐ ๐ sq. units OR ยฝ sq. units 23. 7 and โ 9
24. Number of bottle of medicine M1 = 10500, number of bottle of medicine M2 = 34500 and
maximum profit = Rs. 325500 25.
๐๐
๐๐๐
๐ถ๐น
๐
๐๐
.
4. Unsolved Practice Paper โ 2
Section A
1. Find the position vector of a point R which divided the line joining two points P and Q, whose
position vectors are ๐ฬ + ๐๐ฬ โ ๐ฬ and โ๐ฬ + ๐ฬ + ๐ฬ respectively , in the ration 2: 1 internally.
2. Evaluate :- โซ
( ๐+๐)(๐+๐๐๐ ๐) ๐
๐
dx.
3. Evaluate : cos-1 (- ยฝ ) + sin-1 (- ยฝ ) .
4. Evaluate the integral : โซ ๐ฑ (๐ โ ๐ฑ) ๐ง
dx.
5. Let A = { 1, 2, 3} . the relation R on set A is defined as R = { ( 1, 1 ), (1,2 ), (2,1 ),(2,2) } . Check whether
R is transitive or not .
6. If A is square matrix such that AT A = I , write the value of | ๐ด|.
Section B
7. Find the absolute maximum and absolute minimum values of ๏ฆ (x) = x + sin 2x , x ๏ [0,2๏ฐ].
8. Show that the relation R on R , defined as R = { ( a,b ) : a < b2 } , is neither reflexive nor symmetric
nor transitive .
OR
Find go๏ฆ and ๏ฆ og , when ๏ฆ : R ๏ฎ R are g: R ๏ฎR are defined by ๏ฆ (x) = | ๐| and g (x) = | ๐๐ โ ๐|.
9. In the first five months , the performance of a student in x months is governed by the relation
( x) = 2x3 - 9x2 + 12x + 1 . Find the months in which the performance of the student is increasing or
decreasing . What life skills should the student develop to improve his performance ?
10. If y = A cos (log x) + B sin (log x) , then prove that x2 y2 + xy1 + y = 0.
11. How many time must a man toss a fair coin so that the probability of having at least one head is
more than 80% ? OR
Suppose X has binomial distribution B ( 6, ยฝ ) . show that X = 3 is the most likely Outcome.
12. Evaluate : โซ( ๐ฌ๐ข๐งโ๐
๐) ๐
dx .
13. Show that the area of a parallelogram with diagonals 3๐ฬ + ๐ฬ โ ๐๐ฬ ๐๐๐ ๐ฬ โ ๐๐ฬ + ๐๐ฬ is 5โ ๐ sq
units.
14. Write in the simplest from : tan-1 (
๐๐ ๐
๐โ ๐ ๐
๐ ๐โ ๐๐๐ ๐) ; ๐ > 0 ; โ
๐
โ๐
โค ๐ โค
๐
โ๐
.
OR
Prove that tan-1 (
๐๐โ ๐ ๐
๐โ ๐๐ ๐ ) = tan-1 x + tan-1 (
๐๐
๐โ ๐ ๐ ) ; | ๐| <
๐
โ๐
.
15. Discuss the continuity of the function ๏ฆ (x) = sin x โ cos x.
16. Differentiate the following w.r.t. x: cot-1 โ
๐+๐
๐โ๐
.
5. 17. Evaluate : โซ
๐
๐
๐
๐+ ๐
๐
๐
dx .
18. Evaluate : โซ
๐๐๐ ๐
๐
๐๐๐ ๐ ๐+ ๐๐๐ ๐ ๐
๐
๐
๐
dx.
OR
Evaluate:- โซ | ๐ + ๐|
๐
โ๐
dx.
19. Find the general solution of the differential equation ( 1 + x2 )
๐ ๐
๐ ๐
+ y = tan-1 x.
Section C
20. There are three coins. One is a two โ headed coin (having head on both faces ), another is a biased
coin that come tails up 25% of the times and the third is an unbiased coin. One of the three coins is
chosen at random and tossed, it shows head , what is the probability that it was the two โ headed
coin ?
OR
A bag contains 4 balls. Two balls are drawn at random and are found to be white. What is the
probability that all balls are white?
21. Find the equation of the plane through the line of intersection of ๐โ .( ๐ฬ + ๐ฬ + ๐ฬ) = ๐ and
๐โ .( ๐๐ฬ + ๐๐ฬ + ๐๐ฬ)โ ๐ = ๐ and parallel to the line
๐โ๐
๐
=
๐โ๐
โ๐
=
๐+๐
๐
.
22. Show that A = [
๐ ๐
โ๐ โ๐
] satisfies A2 - 3A โ 7I = O and hence find A-1 .
23. A factory owner purchases two types of machines, M1 and M2 for his factory. The requirements and
limitations for the machines are as follows:
Area Occupiedby Each
Machine
Labour Force for
Each Machine
Daily Output
Machine M1 1000 sq m 12 men 60 units
Machine M2 1200 sq m 8 men 40 units
He has an area of 9000 sq.m. and 72 skilled men who can operate the machines. How many
machines of each type should he buy to maximize the daily output? Formulate the above L.P.P.
mathematically and then solve it graphically.
24. Find the area of the circle 4x2 + 4y2 = 9 which is interior to the parabola x2 = 4y.
OR
Find the area bounded by the curves (x โ 1)2 + y2 = 1 and x2 + y2 = 1.
6. 25. Find the distance of the point (2, 3, 4) from the plane 3x + 2y + 2z + 5 = 0 measured parallel to the
line
๐+๐
๐
=
๐โ๐
๐
=
๐
๐
.
26. Prove that |
โ๐๐ ๐ ๐
+ ๐๐ ๐ ๐
+ ๐๐
๐ ๐
+ ๐๐ โ๐๐ ๐ ๐
+ ๐๐
๐ ๐
+ ๐๐ ๐ ๐
+ ๐๐ โ๐๐
| = (ab + bc + ca) 3 .
ANSWERS
1.
โ๐ฬ+ ๐๐ฬ+ ๐ฬ
๐
2.
(๐+๐๐๐ ๐) ๐
๐
+ C 3.
๐
๐
4.
๐
๐+๐
โ
๐
๐+๐
5. Yes 6. ๏ฑ 1
7. Absolute maximum value of f(x) is 2๏ฐ which occurs at x = 2๏ฐ and absolute minimum value of f(x) is 0
which occurs at x = 0.
8. g o f : R โ R such that (g o f) (x) = | ๐| ๐ |โ๐| and f o g : R โ R such that (f o g) (x) = | ๐๐ โ ๐| .
10. The performance of the student is increasing during the first, third, fourth and fifth months,
whereas it is decreasing during the second month. The life skills the student must develop to
improve his performance are hard work, grif, determination, commitment, regularity and sincerity.
11. 3 12. (sin-1 x)2 + 2(sin-1 x) โ๐ โ ๐ ๐ - 2x + C 14. 3 tan-1 (
๐
๐
)
15. f is continuous at all points of its domain. 16.
โ๐
๐ โ ๐ ๐โ ๐ ๐
17. ๐๐
๐
๐ โ ๐๐
๐
๐ + ๐๐
๐
๐ โ ๐ ๐๐๐ |๐
๐
๐ + ๐ | + ๐ช 18.
๐
๐
OR 29
19. ๐๐๐ญ๐๐งโ๐
๐
= ๐๐ญ๐๐งโ๐
๐ ( ๐ญ๐๐งโ๐
๐ โ ๐)+ ๐ช 20.
๐
๐
๐ถ๐น
๐
๐
21. x โ z + 2 = 0
22.
๐
๐
[
๐ ๐
โ๐ โ๐
]
23. Number of machines M1 = 6, number of Machines M2 = 0 and maximum daily output = 320 units.
24. [
โ๐
๐
+
๐
๐
๐ฌ๐ข๐งโ๐
(
๐โ๐
๐
)] ๐๐. ๐๐๐๐๐ ๐ถ๐น (
๐๐
๐
โ
โ๐
๐
) sq. units 25. 7 units.
7. Unsolved Practice Paper โ 3
Section โ A
1. Find the angle between vectors ๐โโ ๐๐๐ ๐โโ with magnitudes โ ๐ and 2 respectively having ๐โโ . ๐โโ = โ ๐.
2. Evaluate :- โซ ๐๐๐ ( ๐๐๐ ๐) ๐๐๐ ๐ ๐ ๐ .
3. Find the direction cosines of a line which makes equal angles with the coordinate axes.
4. Write the value of x โ y + z from the following equations : [
๐ + ๐ + ๐
๐ + ๐
๐ + ๐
] = [
๐
๐
๐
] .
5. If ๐โโ ๐๐๐ ๐โโ are two vectors such that |๐โโ ร ๐โโ | = ๐โโ . ๐โโ , then what is the angle between ๐โโ ๐๐๐ ๐โโ ?
6. Evaluate :- โซ
๐
๐
๐
๐
dx.
Section - B
7. Evaluate :- โซ
๐๐๐ ๐
(๐+๐๐๐ ๐) ๐ dx.
8. Find the angle between the line
๐+๐
๐
=
๐๐+๐
๐
=
๐โ๐
โ๐
and the plane 10x + 2y โ 11z = 3.
9. If ๐โโ ๐๐๐ ๐โโ are two vectors such that | ๐โโ | = 3, |๐โโ | = 4 and |๐โโ + ๐โโ |= โ ๐ , then find ๐โโ . ๐โโ .
10. Prove that :- ๐ฌ๐ข๐งโ๐ ๐
๐
โ ๐ฌ๐ข๐งโ๐ ๐
๐๐
= ๐๐จ๐ฌโ๐ ๐๐
๐๐
.
OR
Prove that :- 2 ๐ญ๐๐งโ๐ ๐
๐
+ ๐ญ๐๐งโ๐ ๐
๐
= ๐๐๐โ๐ ๐๐
๐๐
11. Verify (if applicable) Lagrangeโs mean value theorem for the function f(x) = sin4 x + cos4 x on [๐,
๐
๐
] .
OR
Prove that y =
๐ ๐๐๐ ๏ฑ
(๐+๐๐๐ ๏ฑ )
- ๏ฑ is an increasing function of ๏ฑ on [๐,
๐
๐
] .
12. If F(x) = [
๐๐๐ ๐ โ ๐๐๐ ๐ ๐
๐๐๐ ๐ ๐๐๐ ๐ ๐
๐ ๐ ๐
] , then show that F(x) F(y) = F(x + y).
13. In a hostel, 60% of the students read Hindi newspaper , 40% read English newspaper and 20% read
both Hindi and English newspapers. A student is selected at random.
a. If she reads Hindi newspaper , find the probability that she reads English newspaper.
b. If she reads English newspaper, find the probability that the reads Hindi newspaper.
OR
An instructor has a question bank consisting of 300 easy True/ False questions, 200 difficult True/
False questions, 500 easy multiple choice questions and 400 difficult multiple choice questions. If a
question is selected at random from the question bank, what is the probability that it will be an easy
question given that it is multiple choice question?
8. 14. Find the equation of tangent to the curve y =
๐โ๐
( ๐โ๐)(๐โ๐)
at the point where it cuts the x โ axis.
15. If y = 3e2x + 2e3x , then prove that y2 โ 5y1 + 6y = 0.
OR
If ey (1 + x) = 1, then prove that y2 = (y1 )2 .
16. Find the adjoint of the given matrix [
๐ โ๐
๐ ๐
] .
17. Using properties of determinants, prove that |
๐๐๐ ๐ถ ๐๐๐ ๐ท ๐๐๐ (๐ถ + ๐ท)
๐๐๐ ๐ท ๐๐๐ ๐ท ๐๐๐ (๐ท + ๐ถ)
๐๐๐ ๐ธ ๐๐๐ ๐ธ ๐๐๐ (๐ธ+ ๐น)
| = 0.
18. Evaluate :-- โซ
๐๐๐ ๐
๐๐๐ ๐๐
dx.
19. A population grows at the rate of 8% per year. How long does it take for the population todouble?
The government runs various programmes to educate people about the disadvantages of large
families. Would you like to volunteer for these programmes?
Section - C
20. An open box with a square base is to be made out of a given quantity of cardboard of area c2 square
units. Show that the maximum volume of the box is
๐ ๐
๐โ๐
cubic units.
21. Bag I contains 3 red and 4 black balls and Bag II contains 5 red and 6 black balls. One ball is drawn at
random from one of the bags and is found to be red. Find the probability that it was drawn from Bag
II.
OR
Three bags A, B , C contain 6 red, 4 black; 4 red, 6 black and 5 red, 5 black balls respectively. One of
The bags is selected at random and a ball is drawn from it. If the ball drawn is red, find the
probability that it is drawn from the bag A.
22. If f(x) =
๐๐+๐
๐๐โ๐
, ๐ โ
๐
๐
, then show that (f o f) (x) = x, for all x โ
๐
๐
. what is the inverse of f?
23. A factory makes tennis rackets and cricket bats. A tennis racket takes 1.5 hours of machine time and
3 hours of craftsmanโs time in making, while a cricket bat takes 3 hours of machine time and 1 hour
of craftsmanโs time. In a day, the factory has the availability of not more than 42 hours of machine
time and 24 hours of craftsmanโs time. What number of rackets and bats must be made if the factory
is to work at full capacity? If the profit on a racket and on a bat is Rs. 20 and Rs. 10 respectively, find
the maximum profit of the factory when it works at full capacity. Express it as an L.P.P. and then
solve it.
9. 24. Find the vector and Cartesian equations of the line passing through the point (1, 2, -4) and
perpendicular to the two lines
๐โ๐
๐
=
๐+๐๐
โ๐๐
=
๐โ๐๐
๐
๐๐๐
๐โ๐๐
๐
=
๐โ๐๐
๐
=
๐โ๐
โ๐
.
25. Find the area of the region lying in the second quadrant and bounded by y = 4x2 , x = 0, y = 1 and y=4.
OR
Find the area bounded by the curve y = cos x between x = 0 and x - 2๏ฐ .
26. Evaluate :- โซ ๐๐จ๐ญโ๐
(๐ โ ๐ + ๐ ๐
)
๐
๐
dx
ANSWERS
1. 45o 2. Cos (cos x) + C 3.
๐
โ๐
,
๐
โ๐
,
๐
โ๐
๐ถ๐น โ
๐
โ๐
, โ
๐
โ๐
, โ
๐
โ๐
4. 1 5. 45o 6. log
๐
๐
7.
๐
๐+๐๐๐ ๐
+ C
8. sin-1 (
๐
๐๐
) 9. -10 13. (i)
๐
๐
, (ii) ยฝ OR
๐
๐
14. x โ 20 y = 7 16. [
๐ ๐
โ๐ ๐
] 18.
๐
๐
๐๐๐ |
๐๐๐ ๐โ๐
๐๐๐ ๐+๐
| โ
๐
๐โ๐
๐๐๐ |
โ๐ ๐๐๐ ๐โ๐
โ๐ ๐๐๐ ๐+๐
| + ๐ช
19.
๐๐
๐
log 2 years. Yes, I would to like to volunteer for these programmes because we can stop
population explosion only by educating people about the disadvantages of large families.
21.
๐๐
๐๐
๐ถ๐น
๐
๐
22. f-1 (x) =
๐๐+๐
๐๐โ๐
, ๐๐๐ ๐๐๐ ๐ โ
๐
๐
23. Number of tennis rackets = 4, number of cricket bats = 12 and maximum profit = Rs. 200.
24. Vector form : ๐โ = (๐ฬ + ๐๐ฬ โ ๐๐ฬ ) + ๏ฌ(๐๐ฬ + ๐๐ฬ + ๐๐ฬ ) ๐๐๐ ๐ช๐๐๐๐๐๐๐๐ ๐๐๐๐ โถ
๐โ๐
๐
=
๐โ๐
๐
=
๐+๐
๐
.
25.
๐
๐
sq. units OR 4 sq. units 26.
๐
๐
- log 2
10. Unsolved Practice Paper โ 4
Section A
1. The side of a square sheet is increasing at the rate of 4 cm/min. at what rate is the area increasing,
when the side is 5cm long?
2. Find the scalar and vector components of the vector with initial point (2, 1) and terminal point (-5, 7).
3. If A = [
โ๐ ๐
๐ ๐
] and BT = [
๐ ๐
๐ ๐
] , then find (7A + 5B)T .
4. Evaluate :- โซ
๐๐๐ ๐ ๐
๐
dx.
5. From the differential equation corresponding to y2 = (x โ a)3 , by eliminating a.
6. Evaluate :- โซ ๐๐๐ ๐
๐ ๐๐๐ ๐
๐ ๐ ๐
๐
โ๐
.
Section - B
7. If x = a(cos ๏ฑ + ๏ฑ sin ๏ฑ ) , y โ a (sin ๏ฑ - ๏ฑ cos ๏ฑ ) , then prove that
๐ ๐
๐
๐ ๐ ๐ =
๐๐๐ ๐
๏ฑ
๐๏ฑ
.
OR
If y = tan x + sec x, then prove that
๐ ๐
๐
๐ ๐ ๐ =
๐๐๐ ๐
( ๐โ๐๐๐ ๐) ๐ .
8. A wire of length 20 m is to be cut into two pieces. One of the pieces will be bent into a shape of a
square and the other into a shape of an equilateral triangle. What should be the lengths of the two
pieces so that the sum of the areas of the square and the triangle is minimum?
9. Evaluate :- โซ
๐๐๐ ๐๐ ๐๐๐ ๐๐
โ ๐โ ๐๐๐ ๐ ๐๐
dx
10. If the function f(x) = {
๐๐๐ + ๐ ๐๐ ๐ > 1
๐๐ ๐๐ ๐ = ๐
๐๐๐ โ ๐๐ ๐๐ ๐ < 1
is continuous at x = 1, find the values of a and b.
11. A driver starts a car from a point P at time t = 0 seconds and stops at point Q. the distance x (in
meters) covered by it in t seconds is given by x = t2 ( 2 -
๐
๐
) . find the time taken by it to reach Q and
also find the distance between P and Q. the driver has stopped the car at the time Q on the roadside
to take the call on his mobile phone. Has he done right in doing so?
12. Differentiate cos xx w.r.t. x.
13. Evaluate :- โซ
๐
๐+๐ ๐๐๐ ๐
dx
14. If the vertices A, B and C of a ๏ABC are (1, 2, 3), (-1, 0, 0) , (0, 1, 2) respectively, then find ๏ABC using
vectors.
15. Solve :- 4 sin-1 x = ๏ฐ - cos-1 x. OR Solve :- sin-1 x =
๐
๐
+ cos-1 x
16. Evaluate :- โซ ( ๐๐๐๐ ๐๐๐๐ โ ๐๐๐ ๐๐๐ ๐๐) ๐ ๐
๐
๐
๐
. OR Evaluate :- โซ ๐๐๐ (๐ + ๐๐๐ ๐) ๐ ๐
๐
๐
๐
11. 17. Find the area of the region in the first quadrant enclosed by the x โ axis, line x = โ ๐ y and the circle
x2 + y2 = 4.
18. Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls.
Find the probability that
a. Both are red
b. First is black and second is red
c. One of them is black and other is red.
OR
A bag contains 3 white, 5 black and 2 red balls. Three balls are drawn from it. Find the probability
that
a. One is white, one is black and one is red.
b. Balls drawn are white, black and red respectively.
c. One is red and two are white
19. Find the particular solution of the differential equation (x3 + x2 + x + 1)
๐ ๐
๐ ๐
= 2x2 + x given that y = 1
when x = 0.
Section - C
20. A brick manufacturer has two depots, P and Q with stocks of 30000 and 20000 bricks respectively. He
receives orders from three builders A, B and C for 15000, 20000 and 15000 bricks respectively. The
cost in Rs. For transporting 1000 bricks to the builders from the depots is given in the following
tables.
To
From
A B C
Q
40 20 30
P
20 60 40
How should the manufacturer fulfil the orders so as to keep the cost of transportation minimum?
Formulate the above L.P.P. mathematically and then solve it graphically.
21. Find the equation of the plane that contains the lines ๐โ = ( ๐ฬ + ๐ฬ) + ๏ฌ (๐ฬ โ ๐ฬ + ๐๐ฬ) and ๐โ =
( ๐ฬ + ๐ฬ) + ๏ญ (๐ฬ + ๐๐ฬ โ ๐ฬ) .
22. If A = [
๐ โ๐ ๐
๐ ๐ โ๐
๐ ๐ โ๐
] , then find A-1 . using A-1 , solve the system of equations:
12. 2x - 3y + 5z = 11, 3x + 2y - 4z = -5, x + y โ 2z = -3.
23. Let L be the set of all lines in the XY plane and R be the relation on L defined as R = {(L1 , L2 ) : L1 is
parallel to L2 }. Show that R is an equivalence relation. Find the set of all the lines related to the line y
= 2x + 4 (i.e., find the equivalence class of the line y = 2x + 4).
OR
Show that the given relation R is defined on the set A = {x ๏ Z : 0 ๏ฃ x ๏ฃ 12}, given by
R = {(a, b) : | ๐ โ ๐| is multiple of 4}, is an equivalence relation. Write the set of all elements related
to 1.
24. Find the equation of the plane passing through the point (3, 0, -1) and parallel to the lines
๐โ๐
๐
=
๐โ๐
๐
=
๐
๐
and ๐โ = (โ๐ฬ + ๐๐ฬ โ ๐๐ฬ) + ๏ฌ (๐๐ฬ โ ๐๐ฬ + ๐๐ฬ).
25. Suppose 5 men out of 100 and 25 women out of 1000 are orators. An orators is chosen at random.
Find the probability of a male person being selected, assuming that there are equal number of men
and women.
OR
Suppose 5% of men and 0.25% of women have grey hair. A grey haired person is selected at random.
What is the probability of this person being male? Assume that there are equal number of males and
females.
26. Without expanding, prove that |
๐ + ๐๐ ๐ + ๐ ๐ ๐ + ๐๐
๐๐ + ๐ ๐๐ + ๐ ๐๐ + ๐
๐ ๐ ๐
| = ( ๐ โ ๐ ๐)|
๐ ๐ ๐
๐ ๐ ๐
๐ ๐ ๐
| .
ANSWER :
1. 40 cm2 / min
2. Scalar components of ๐จ๐ฉโโโโโโ are -7 ,6 and vector components of ๐จ๐ฉโโโโโโ are -7๐ฬ ,6๐ฬ .
3. [
โ๐ ๐๐
๐๐ ๐๐
] 4.
๐
๐
(logx2 )2 + C
5. 2
๐ ๐
๐ ๐
= 3๐
๐
๐ 6. 0
8.
๐๐โ๐
๐+๐โ๐
m and
๐๐๐
๐+๐โ๐
m 9.
๐
๐
sin-1 (
๐๐๐ ๐
๐๐
๐
) + C
10. a = 3, b= 2
11. 4s,
๐๐
๐
m . Yes , he has done right . One should not the mobile phone while driving
13. 12. โ sin xx xx ( 1 + log x ) 13.
๐
โ๐
๐ญ๐๐งโ๐
[
๐๐๐
๐
๐
โ๐
] + C
15.
โ๐
๐
OR ยฝ 16.
๐
๐
log ยผ OR
๐
๐
log 2
17.
๐
๐
sq. units
18. (i)
๐๐
๐๐
, (ii)
๐๐
๐๐
(iii)
๐๐
๐๐
OR (i) ยผ (ii)
๐
๐๐
(iii)
๐
๐๐
19. y =
๐
๐
log | ๐ + ๐|+ ยพ log |๐ ๐
+ ๐|- ยฝ tan-1 x + 1
20. 15000, 0 and 15000 bricks should be transported from P to A,B and C respectively ; 0, 20000 and 0
bricks should be transported from Q to A, B and C respectively and minimum cost of transportation
= Rs. 1300.
21. โx + y + z = 0 22. A-1 = [
๐ ๐ โ๐
โ๐ ๐ โ๐๐
โ๐ ๐ โ๐๐
] ; x = 1 , y = 2, z = 3
23. { y = 2x + c : c ๏ R } OR { 1,5,9} 24. 17x +2y โ 7z โ 58 = 0
25.
๐
๐
๐ถ๐น
๐๐
๐๐
14. Unsolved Practice Paper โ 5
Section A
1. If A = B are square matrices of the same order such that | ๐จ| = 6 and AB = I, then write the value of | ๐ฉ|.
2. Evaluate the integral: โซ ๐ ๐๐๐ ๐
๐
๐
๐
dx.
3. Let A = {1,2,3,) . The reaction R on set A is defined as R = { ( 1,1) , (1,2)} , check whether R is transitive or
not.
4. Evaluate : sin [
๐
๐
โ ๐ฌ๐ข๐งโ๐
(โ
๐
๐
)] .
5. Find the position vector of a point R which divides the line joining two point P and Q , whose position
vector are ๐ฬ + 2๐ฬ โ ๐ฬ and - ๐ฬ + ๐ฬ + ๐ฬ respectively ,in the ratio 2: 1 externally.
6. Evaluate :
๐
๐โ โ ๐
dx
Section B
7. Test whether the relation R on z define by R = { ( a ,b), : | ๐ โ ๐| < 5 } is reflexive , symmetric and
transitive .
OR
Let ๏ฆ : R ๏ฎ R be the signum function defined as ๏ฆ (x) = โซ
๐ ๐๐ ๐ > 0
๐ ๐๐ ๐ = ๐
โ๐ ๐๐ ๐ < 0
and g : R ๏ฎ R be the
greatest integer function given by, g (x) = ๏ชx ๏ช. Do ๏ฆ o g and g o ๏ฆ coincide in ( 0, 1 ] ?
8. Find the area of parallelogram whose adjacent sides are determined by the vector ๐โโ = ๐ฬ - ๐ฬ + 3๐ฬ and
๐โโ = 2๐ฬ -7๐ฬ + ๐ฬ
9. Find the absolute maximum and absolute minimum values of ๏ฆ (x) = 12๐
๐
๐ โ 6๐
๐
๐, x ๏ [ -1 ,1].
OR
Find the point of local maxima and local minima, if any , of ๏ฆ (x) = x โ ๐ โ ๐ , 0,< x < 1 using first
derivative test .Also , find the local maximum and local minimum values, as the case may be.
10. Three groups of children contain 3 girls and 1 boy ; 2 girls and boys ; 1 girl and 3 boys respectively . One
child is selected at random from each group . Find the chance that the three selected comprise one girl
and two boys. These three selected will participate in a debate competition on โCLEANLINESSโ. what
are your views on cleanliness?
11. If y = sin (sin x) , then proved that
๐ ๐
๐
๐ ๐ ๐ + tan x
๐ ๐
๐ ๐
+ cos2 xy = 0.
12. Find the intervals on which ๏ฆ (x) = tan-1 ( sin x + cos x ) x ๏ ( 0,
๐
๐
) is
(i) strictly increasing or strictly decreasing (ii) increasing or decreasing
15. OR
Find the point on the curve y = x3 โ 11x + 5 at which the equation of tangent is y = x - 11.
13. Prove that cos [๐ ๐ญ๐๐งโ๐ ๐
๐
] = sin [๐ ๐ญ๐๐งโ๐ ๐
๐
] .
14. Differentiate the following w.r.t. x: cos-1 (
๐+ โ ๐โ ๐ ๐
โ๐
) .
15. Evaluate the integral : ๏ฒ x sin-1 x dx
16. Show that the function ๏ฆ (x) = | ๐ โ ๐|is not differentiable at x = 1.
17. Find the particular solution of the differential equation ( x โ y ) ( dx โ dy ) , given that y = 1 when x = 0 .
18. Evaluate : โซ (๐๐๐ | ๐| + ๐๐๐ | ๐|
๐
๐
โ
๐
๐
dx
OR
Evaluate: โซ
๐๐๐๐+๐๐๐ ๐
โ๐๐๐ ๐๐
๐
๐
๐
๐
dx
19. Evaluate : โซ
๐
โ ๐๐๐ ๐ ๐ ๐๐๐(๐+ ๐ถ)
dx
Section C
20. Find the equation of the plane which passes through the line of intersection of the planes x + y + z =
and 2x + 3y + 4z = 5 and parallel to x โ axis .
21. Prove that |
๐ ๐ + ๐ ๐ โ ๐
๐ โ ๐ ๐ ๐ + ๐
๐ + ๐ ๐ โ ๐ ๐
| = ( a+ b + c ) ( a2 + b2 +c2 ).
22. A fruit grower can use two types of fertilisers in his garden, brand P and Q. The amounts (in kg) of
nitrogen , phosphoricacid , potash and chlorine in a bag of each brand are given in the table . Tests
indicate that the garden need at least 240 kg of phosphoricacid , at least 270 kg of potash and at most
310 kg of chlorine . If the grower wants to minimize wants to minimise the amount of nitrogen added
to the garden , how many bags of each brand should be used ? What is the minimum amount of
nitrogen added in the garden ? Formulate the above L.P.P. mathematically and solve it graphically
Brans P Brand Q
Nitrogen 3 3.5
Phosphoricacid 1 2
Potash 3 1.5
Chlorine 1.5 2
23. Sketch the graph of the curve y = | ๐ฅ + 3| and evaluate | ๐ฅ โ 3|dx .
16. OR
Find the area bounded by the curve y = x ๏ช x ๏ช , x โaxis and the ordinates x = 1 and x = -1.
24. Find the distance of the point ( -2, 3, -4 ) from the line
๐+๐
๐
=
๐๐+๐
๐
=
๐๐+๐
๐
measured parallel to the
plan 4x + 12 y โ 3z + 1 = 0.
25. Suppose a girl throws a die . If she gets a 5 or 6, she tosses a coin three times and notes the number of
heads . If she gets a 1, 2, 3, or 4,: she tosses a coin once and notes whether a head or tail is obtained . If
she obtains exactly one head , what is the probability that she threw 1,2,3 or 4 with the die ?
OR
An insurance company insures 3000 scooters ,4000 cars and 5000 trucks. The probability of an accident
involving a scooters , a car and a truck is 0.02 .0.03, and 0.04 respectively . one of the insured meet
vehicles with an accident . Find the probability that it is a truck .
26. Find the inverse of [
๐ ๐ โ๐
๐ ๐ ๐
๐ ๐ ๐
] , using Elementary Row Transformation method .
ANSWER :-
1.
๐
๐
2. 1 3. Yes 4. 1
5. -3๐ฬ + 0๐ฬ + 3๐ฬ 6. 2 log |โ ๐ โ ๐|+ C
7. R is reflexive, symmetric but not transitive. OR NO
8. 15โ ๐ sq. units
9. Absolute maximum value of ๏ฆ (x) is 18 which occurs at x = -1 and absolute minimum value of ๏ฆ (x) is
โ
๐
๐๐
which occurs at x =
๐
๐
. OR
f(x) has local maximum at x =
๐
๐
and local maximum values is f(
๐
๐
) =
๐โ๐
๐
.
10.
๐๐
๐๐
. Everyone must acquire a habit of cleanliness so keep the surrounding clean.
12. (i) ๏ฆ(x) is strictly increasing on ( 0,
๐
๐
) , (ii) f(x) is increasing on ( 0,
๐
๐
) .
OR ( 2,- 9 ) and ( -4 ,-15 )
14.
๐
โ ๐โ ๐ ๐
15. -
๐ฌ๐ข๐งโ๐
๐ (๐โ๐๐ ๐
)
๐
+
๐ โ ๐โ ๐ ๐
๐
+ C
17. log ๏ชx- y ๏ช x +y + 1 18. 4. OR sin-1 (
โ๐
๐
โ
๐
๐
) - sin-1 (
๐
๐
โ
โ๐
๐
)
19. -
๐
๐๐๐ ๐ถ
โ ๐๐๐ ๐ถ+ ๐๐๐ ๐ถ ๐๐๐ ๐ถ + C 20. โy -2z + 3 = 0
22. Number of bags of brand P fertilizer = 40 , number of page of brand Q fertilizes = 100
and minimum amount of nitrogen added in the garden = 470 kg.
17. 23. 9 OR
๐
๐
sq. units 24.
๐๐
๐
units 25.
๐
๐๐
OR
๐๐
๐๐
26.
[
๐
๐
โ
๐
๐
๐
๐
๐
๐
๐
๐
๐
โ
๐
๐
๐
๐
๐]
.
18. Unsolved practice Paper - 6
Section A
1. Let ๐โโ = ๐ฬ + ๐๐ฬ ๐๐๐ ๐โโ = ๐๐ฬ + ๐ฬ . ๐๐ | ๐โโ | = |๐โโ | ? Are the vectors ๐โโ and ๐โโ equal ?
2. Evaluate : โซ
๐
๐+๐๐๐ ๐๐
dx .
3. It is given that at x = 1 , the function ๏ฆ (x) = x4 โ 62 x2 + ax + 9 attains its maximum value on the
interval [ 0,2 ] . find the value of a.
4. Evaluate : โซ( ๐ โ ๐)โ ๐ dx .
5. Determine the order and degree ( if defined ) of the following differential equation :
y = xp + โ๐ ๐ ๐ ๐ + ๐ ; p =
๐ ๐
๐ ๐
.
6. If A is an invertible matrix of order 3 ๏ด 3 and | ๐จ| = 7 , then find adj ( adj A ) .
Section B
7. A man 2 m tall is curious to see his shadow increasing . He walks at a uniform speed of 5km/h
away from a lamppost 6 metres high . Find the rate at which the length of his shadow increases
when he is 1 metre away from the pole . what value is highlighted in this question ?
8. If x = a ( ๏ฑ - sin ๏ฑ ) and y = a ( 1 + cos ๏ฑ ) , then prove that
๐ ๐
๐
๐ ๐ ๐ =
๐
๐ (๐โ๐๐๐ ๏ฑ ) ๐
OR
If x = a cos ๏ฑ and y = b sin ๏ฑ , then prove that
๐ ๐
๐
๐ ๐ ๐ = -
๐ ๐
๐ ๐ ๐ ๐ .
9. Show that of all the rectangles inscribed in a given circle , the square has maximum perimeter .
10. Evaluate : โซ
๐
โโ๐๐ ๐ + ๐๐+๐
dx.
11. For what value of is the function defined by f(x) = {
๏ฌ (๐ ๐
โ ๐๐) ๐๐ ๐ โค ๐
๐๐ + ๐ ๐๐ ๐ > 0
Continuous at x = 0?
What about continuity at x = 1 ?
12. Evaluate : โซ
๐
๐โ๐ ๐๐๐ ๐๐ ๐
dx.
13. Differentiate ๐ ๐ ๐
w.r.t. x.
14. Find the area between the curves y = x and y = x2 .
15. Find x and if ( 2๐ฬ + 6๐ฬ + 27๐ฬ ) ๏ด (๐ฬ + ๏ฌ ๐ฬ + ๏ญ๐ฬ ) = 0 .
16. Solve : 2 tan-1 x = sin-1 (
๐๐
๐+ ๐ ๐)+ sin-1 (
๐๐
๐+ ๐ ๐) .
OR
Solve : tan-1 (2 + x) + tan-1 (2 โ x) = tan2-1 ๐
๐
19. 17. Find the particular solution of the deferential equation cos (
๐ ๐
๐ ๐
) = a , given that y = 1 when x = 0.
18. Evaluate the integral : โซ ๐๐๐ [
๐
๐
โ ๐]
๐
๐
dx
OR
Evaluate : โซ ๐๐๐ [
๐+๐ ๐๐๐ ๐
๐+๐ ๐๐๐ ๐
]
๐
๐
๐
dx
19. Two cards are drawn from a pack of 52 cards . What is the probability of getting
(i) first card red and second card king ? (ii) a red card and a king card ?
OR
Two cards are drawn from a pack of 52 cards . Find the probability that
(i) First is heart card and second is red card .
(ii) One is hear card and other is red card.
Section C
20. Prove that the lines
๐+๐
โ๐
=
๐โ๐
๐
=
๐โ๐
๐
๐๐๐
๐+๐
โ๐
=
๐โ๐
๐
=
๐โ๐
๐
are coplanar . Also find the plane
containing these two lines.
21. An oil company has two deport , P and Q with capacities of 7000 liters and 4000 liters respectively .
The company is to supply oil to three petrol pumps D, E and F whose requirements are 4500 litres,
3000 litres and 3500 litres respectively . The distance ( in km ) between the depots and petrol pumps
is given in the following table:
Distance( in km)
To From P Q
D 7 3
E 6 4
F 3 2
Accounting that the transportation cost per km is Rs. 2 per litre, how should the delivery be
scheduled in order that the transportation cost is minimum? Formulate the above L.P.P.,
mathematically and then solve it graphically.
22. Let S be the set of all points in a plane and R be a relation on S, defined by
R = {(P, Q): Distance between P and Q is less than 4.5 units}.
OR
Show that the relation R defined on the set A = {1, 2, 3, 4, 5}, given by R = {(a, b): | ๐ โ ๐| is even}, is
an equivalence relation. Show that all the elements of {1, 3, 5} are related so each other all the
elements of {2, 4} are related to each other, but no element of {1, 3, 5} is related to element of {2, 4}.
23. Solve given system of equation by using matrix method:
20. ๐
๐
+
๐
๐
+
๐๐
๐
= ๐ ,
๐
๐
โ
๐
๐
+
๐
๐
= ๐,
๐
๐
+
๐
๐
โ
๐๐
๐
= ๐ ; x, y, z ๏น 0.
24. In a class 5% of the boys and 10% of the girls have an IQ of more than 150. In this class, 60% of the
students are boys. If a student is selected at random and found to have an IQ of more than 150. Find
the probability that the student is a boy.
OR
In a certain college, 4% of boys and 1% of girls are taller than 1.75 meters. Furthermore, 60% of the
students in the college are girls. A student is selected at random and is found to be taller than 1.75
meters. Find the probability that the selected student is girl.
25. Prove , using properties if determinants: |
๐ ๐ + ๐ ๐ + ๐ + ๐
๐๐ ๐๐ + ๐๐ ๐๐ + ๐๐ + ๐๐
๐๐ ๐๐ + ๐๐ ๐๐๐ + ๐๐+ ๐๐
| = a3 .
26. Show that the plane whose vectorequation is ๐โ .(๐ฬ + ๐๐ฬโ ๐ฬ ) = 6 contains the line whose vectors
equation is ๐โ .( ๐๐ฬ + ๐๐ฬ) + ๏ฌ(๐๐ + ๐ฬ + ๐๐ฬ ).
ANSWER :-
1. | ๐โโ | = |๐โโ | ๐๐๐ ๐โโ โ ๐โโ . 2. tan x + C 3. 120
4.
๐๐
๐
๐
๐
-
๐๐
๐
๐
๐
+ C 5. Order is 1 and degree is 1. 6. 7A
7. 2.5 km/h. Curiosity of the man is highlighted in this question. 10.
๐
โ๐
๐ฌ๐ข๐งโ๐
[
๐๐โ๐
โ๐๐
] + ๐ช
11. f is not continuous at x = 0, for any real value of ๏ฌ and f is continuous at x = 1, for every real value of
๏ฌ .
12.
๐
๐โ๐
๐๐๐ |
โ๐ ๐๐๐ ๐โ โ๐
โ๐ ๐๐๐ ๐+ โ๐
| + C 13. xx ๐ ๐ ๐
[
๐
๐
+ ๐๐๐ ๐ (๐ + ๐๐๐ ๐)] 14.
๐
๐
sq. units
15. ๏ฌ = 3 and ๏ญ =
๐๐
๐
16.
๐โ๐
๐โ๐๐
๐ถ๐น ยฑ ๐ 17. Y = (cos-1 a) x + 1
18. 0 OR 0 19. (i)
๐
๐๐
, ( ๐๐)
๐
๐๐
OR (i)
๐๐
๐๐๐
, (ii)
๐๐
๐๐๐
20. x โ 2y + z = 0
21. 500, 3000 and 3500 litres of oil should be transported from P to D, E and F respectively; 4000, 0 and 0
Litres of oil should be transported from Q to D, E and F respectively and minimum cost of
transportation = Rs. 88000.
23. x = 2, y = 3, z = 5 24.
๐
๐๐
OR
๐
๐
.
21. Unsolved practice paper โ 7
Section A
1. Evaluate: โซ ๐ ๐๐๐ ๐
๐
sin 2x dx.
2. If the operation * is defined on Q as a * b = 2a + b โ ab ; for all a, b ๏ Q , find the value of 3 * 4 .
3. Show that the point (1,0) , (6,0) , (0,0) are collinear .
4. Fine the direction cosines of the vector joining the point A (1,2 โ 3 ) and B (-1,-2 , 1 ) , directed from A
to B.
5. Let A = {1,2.3} . the relation R on set A is defined as R = { (1,1)} . Check whether R is reflexive or not.
6. Evaluate : โซ
๐๐๐ ๐
๐
๐๐๐๐๐ ๐ ๐
dx .
Section B
7. If A and B commuted , than prove that ABn = Bn A , for all n ๏ N.
8. Ten eggs are drawn successively with replacement from a lot containing 10% rotten eggs. What is the
probability that there is at least one rotten egg?
OR
Suppose that 90% of people are right โhanded . what is the probability that at most 8 of a random
sample that 90% people are right โ handed ?
9. If y = ๐๐ญ๐๐งโ๐
๐
, then prove that ( 1+ x2 ) y2 + (2x- 1) y1 = 0 .
10. Differentiate the following w.r.t. x. cos-1 (xโ ๐ โ ๐ + โ ๐ โ๐ โ ๐ ๐ )
OR
Differentiate the following w.r.t.x: cos-1 [
๐๐+๐โ ๐โ ๐ ๐
๐
]
11. Prove that the relation R on Z , defined by (a,b) ๏ R ๏ a-b is divisible by 5, is an equivalence relation
on Z.
OR
Show that the signum function ๏ฆ : R ๏ฎ R , given by ๏ฆ (x) = {
๐ ๐๐ ๐ > 0
๐ ๐๐ ๐ = ๐
โ๐ ๐๐ ๐ < 0
is neither one โ one or
not.
12. Using differentials ,find the approximate value of ( 0.037)1/2 .
13. Evaluate : โซ
๐ ๐
+ ๐
๐ ๐ + ๐
dx
14. Prove that |
๐ ๐ ๐
๐จ ๐ฉ ๐ช
๐ ๐
๐ ๐
๐ ๐
| = (a โ b ) ( b- c ) (c โ a) ( a + b+ c ).
22. 15. Find the particular solution of the differential equation :- x
๐ ๐
๐ ๐
โy + x sin (
๐
๐
) = 0 given that when x = 2 ,
y = ๏ฐ.
16. If ๐โโ โ ๐โโ , ๐โโ . ๐โโ = ๐โโ . ๐โ ๐๐๐ ๐โโ ร ๐โโ = ๐โโ ร ๐โ , then show that ๐โโ = ๐โ .
17. Solve : sin-1 (
๐
๐
)+ cos-1 x =
๐
๐
.
OR
Solve : cos -1 (
๐ ๐
+ ๐
๐ ๐+ ๐
) +
๐
๐
๐ญ๐๐งโ๐
(
๐๐
๐โ ๐ ๐) =
๐๐
๐
.
18. A book store has 20 mathematics books, 15 physics book and 12 chemistry books. Their selling
prices are Rs. 300 , Rs, 320 and Rs.340 each respectively . Find the total amount the store will
receive from selling all the items . Do you thing that we must books our best friend ? Why ?
19. Evaluate : โซ
๐
๐๐๐ ( ๐โ๐) ๐๐๐ (๐โ๐)
dx
Section C
20. If the lengths of three sides of a trapezium other than base are equal to 10 cm, then find the area of
trapezium when it is maximum.
21. Find the coordinates of the point where the line though (5,1,6) and (3, 4, 1 ) crosser the x z โ plane .
22. Evaluate : โซ
๐๐๐ ๐
๐
๐๐๐ ๐ ๐+๐ ๐๐๐ ๐ ๐
๐
๐
๐
dx.
23. A doctor is to visit a patient. From past experience , It is known that the probabilities that he will
come by train , bus scooter or by other means of transport are
๐
๐๐
,
๐
๐
,
๐
๐๐
๐๐๐
๐
๐
respectively . The
probabilities that he will be late are
๐
๐
,
๐
๐
,
๐
๐๐
if he comes by train , bus and scooter respectively . But
if he comes by other means of transport, then he will not be late . When he arrives , he is late. What
is the probability that he comes by train?
OR
In an examination , an examinee either guesses or copies or knows the answer of MCQs with four
choices . The probability that he makes a guess is
๐
๐
, and the probability that he copies answer is
๐
๐
The probability that his answer is correct , given that copied it , is
๐
๐
, . Find the probability that he
copies the answer to question , given that he correctly answered it.
24. Show that the point (0,-1,0) , (1,1,1 ) , (3,3,0) and (0,1,3) are coplanar . Also , find the plane
containing them.
25. Let O,A and O B be the intercept of the ellipse 9x2 +y2 = 36 in the first quadrant such that OA = 2 and
O B = 6 , find the area between the arc AB and the chord A B.
OR
23. Find the area bounded by the curves y = 6x โ x2 and y = x2 โ 2x2 .
26. A toy company manufactures two types of gift items , A and B . Market tests and the available
resources have indicated that the combined production level should not exceed 1200 gift item per
week and the demand for gift item of type B is at most half of for gift items type A. Further , the
production level of gift items A can exceed three times the production of gift items of other type by
at most 600 units the . If the company makes profit of Rs. 12 and 16 per item respectively on gift
items A and B , how many of each should be produced weekly in order to maximise the profit ?
Formulate The above L.P.P mathematically and then solve it graphically .
ANSWER :-
1. ๐ ๐๐๐ ๐
๐
+ ๐ช 2. -2 4. -
๐
๐
,
๐
๐
,
๐
๐
5. No
6. tan x โ x + C 8. 1 - (
๐
๐๐
)
๐๐
OR 1 -
๐๐
๐๐
(
๐
๐๐
)
๐
10. โ
๐
โ ๐โ ๐ ๐
โ
๐
๐โ ๐ โ๐โ๐
OR โ
๐
โ ๐โ ๐ ๐
12. 0.1925
13.
๐
โ๐
๐ญ๐๐งโ๐
(
๐ ๐
โ ๐
โ๐๐
) + C 15. cosec (
๐
๐
) โ ๐๐๐(
๐
๐
) =
๐
๐
17. 1 OR No solution
18. Rs. 14880. Yes, we must make books our best friends because books helps us increase our
knowledge.
19. sec (b โ a) log | ๐๐๐ ( ๐ โ ๐) ๐๐๐ (๐ โ ๐)| + C 20. 75 โ ๐ cm2 21. (
๐๐
๐
, ๐,
๐๐
๐
)
22.
๐
๐
23.
๐
๐
OR
๐
๐๐
24. 4x โ 3y + 2z = 3
25. (3๏ฐ - 6) sq. units OR
๐๐
๐
sq. units
26. Number of gifts items of type A = 800, number of gift items of type B = 400 and maximium profit =
Rs. 16000.
24. Unsolved Practice Paper โ 8
Section โ A
1. Evaluate : โซ
๐ ๐๐
โ ๐โ๐๐
๐ ๐๐+ ๐โ๐๐ dx .
2. If A is a square matrix of order 3 ๏ด 3 such that | ๐ด|= 3 , then find | ๐จ (๐๐ ๐ ๐จ)|.
3. Evaluate : โซ
๐
๐โ๐๐๐ ๐๐
dx
4. Let A = { 1,2,3 } . The relation R on set A is as R = {(1,1), (2,3)}. Check whether R is transitive or not.
5. Find the principal value of cos-1 (
โ๐
๐
).
6. Find are vector ๐โ , prove that ๐โ = ( ๐โ . ๐ฬ) ๐ฬ + ( ๐โ . ๐ฬ) ๐ฬ + (๐โ . ๐ฬ)๐ฬ .
Section B
7. For what value of a the vectors 2 ๐ฬ โ 3๐ฬ + 4๐ฬ and a๐ฬ + 6๐ฬ โ 8๐ฬ are collinear ?
8. Let R be a relation on set A of ordered pairs of positive integers defined by
(a,b) R (c,d ) ๏ ad = bc, for all (a,b ) , (c,d) ๏ A ๏ด A. Show that R is an equivalence relation on A ๏ด A.
OR
Let ๏ฆ : R ๏ฎ R be defined as ๏ฆ (x) = 10x + 7, find the function g: R๏ฎR such that g o ๏ฆ = ๏ฆo g = IR.
9. If the value of derivative of tan-1 (a + bx ) at x = 0 is 1, then prove that 1 + a2 = b.
10. A and b appeared for an interview for two vacancies. The probability of Aโs selection is
๐
๐
and that of
Bโs selection is 1/3. Find the probability that (i) only one of them will be selected (ii) at least one will
by selected .
Name two qualities that a person should possess while appearing for an interview .
OR
A speaks trust in 80% cases and 90% cases . Find the probability that
(i) they contradict each other in stating the same fact.
(ii) they favour each other in stating the same fact .
Who is more trustworthy : A or B?
11. Find the absolute maximum and absolute minimum values of ๏ฆ (x) = (3x2 โ x2 )
๐
๐
,x ๏ [-1,1 ].
12. Solved : tan-1 (
๐โ๐
๐+๐
) =
๐
๐
๐ญ๐๐งโ๐
๐; x > 0.
OR
Prove that : tan[
๐
๐
+
๐
๐
๐๐จ๐ฌโ๐
(
๐
๐
)] + ๐๐๐[
๐
๐
โ
๐
๐
๐๐จ๐ฌโ๐
(
๐
๐
)] =
๐๐
๐
13. Find the intervals on which ๏ฆ (x) =
๐
๐๐
๐ ๐
โ
๐
๐
๐ ๐
โ ๐๐ ๐
+
๐๐
๐
๐ + ๐๐ is
a. strictly increasing or strictly decreasing ; b. increasing or decreasing .
25. 14. Evaluate:- โซ โ
๐โ โ ๐
๐+ โ ๐
dx
15. Evaluate the integral : โซ ๐ฌ๐ข๐งโ๐
(
๐๐
๐+ ๐ ๐ )
๐
๐
dx
OR
Evaluate the integral : |๐ฌ๐ข๐ง ๐ฑ โ ๐๐จ๐ฌ ๐ฑ| dx
16. Show that the function ๏ฆ defined by ๏ฆ (x) = {
๐๐ โ ๐ ๐๐ ๐ < ๐ฅ โค 1
๐๐ ๐
โ ๐ ๐๐ ๐ < ๐ฅ โค 2
๐๐ โ ๐ ๐๐ ๐ > 2
is not differentiable at x=2.
17. Evaluate : ๏ฒ x2 tan-1 x dx .
18. Find the general solution of the differential equation sin-1 (
๐ ๐
๐ ๐
) = x + y .
19. Differentiate w.r.t. x: sin [๐ ๐ญ๐๐งโ๐
โ
๐โ๐
๐+๐
] .
Section C
20. Prove , using properties of determinants : |
( ๐ + ๐) ๐
๐๐ ๐๐
๐๐ ( ๐ + ๐) ๐
๐๐
๐๐ ๐๐ ( ๐ + ๐) ๐
| = 2abc(a + b + c)3 .
21. A dietician has to develop a special diet using two foods P and Q. Each packet (containing 30 g) of
food P contains 12unit of calcium ,4 units of iron, 6 units of cholesterol and 6 units of vitamin A.
Each packet of the same quantity of food Q contains 3 units of calcium ,20 units of iron,4 units of
cholesterol and 3 unit of vitamin A. The diet require at least 240 unit of calcium, at least 460 units of
iron and at most 300 units of cholesterol . How many packets of each food should be used to
minimize the amount of vitamin A in the diet? What is the minimum amount of vitamin A?
Formulate the above L.P.P mathematically and then solve it graphically.
22. There are 3 urns having the following composition of white and black balls: Urn I contains 7 white
and 3 black balls; Urn II contains 4 white and 6 black balls; Urn III contains 2 white and 8 black balls .
One of these urns is chosen with probabilities 0.2 ,0.6 , and 0.2 respectively . from the chosen urn ,
two balls are drawn at random without replacement . Both the balls happened to be white calculate
the probability that the balls drawn were from Urn III.
OR
There are 3 urns having the following composition of white and black balls; Urn I contains 7 white
and 3 black balls; Urn II contains 4 white and 6 black ; urn III contains 2 white and 8 black balls. One
of these urns is chosen with probabilities 0.2,0.6, and 0.2 respectively . from the chosen urn, two
balls are drawn at random with replacement.
Both the balls happened to be white calculate the probability that the balls drawn were from Urn III.
26. 23. Find the equation of plane passing through the point (1,1,-1) and perpendicular to the planes
x+ 2y+3z-7 = 0 and 2x โ 3y 4x = 0 .
24. Find inverse of [
๐ ๐ ๐
๐ ๐ ๐
๐ ๐ ๐
] by using Elementary Row transformation method .
25. Using the method of integration , find the area bounded by the curve | ๐| + | ๐| = 1.
OR
Find the area bounded by the curve y = x3 , the x โ axis and the ordinates x = 1.
26. Show that the lines ๐โ = (โ๐ฬ + ๐๐ฬ+ ๐๐ฬ) + ๏ฌ (โ๐ฬ + ๐๐ฬ + ๐๐ฬ) and ๐โ = (โ๐๐ฬ + ๐ฬ + ๐๐ฬ) +
๏ญ (โ๐๐ฬ + ๐ฬ + ๐๐ฬ) are coplanar. Also, find the equation of the plane containing these two lines.
ANSWERS:-
1.
๐
๐
๐๐๐ |๐ ๐๐
+ ๐โ๐๐
| + C 2. 27 3. โcot x + C
4. Yes 5.
๐๐
๐
7. -4
8. g : R ๏ฎ R defined by g(y) =
๐โ๐
๐๐
10. (i)
๐
๐
, (ii)
๐
๐๐
. A person appearing for an interview should be intelligent and honest. OR
(i)
๐๐
๐๐
, (ii)
๐๐
๐๐
. B is more trustworthy because B peaks more truth than A.
11. Absolute maximum value of f(x) is ๐
๐
๐ which occurs at x = -1 and absolute minimum value of f(x) is 0
which occurs at x = 0.
12.
๐
โ๐
13. (i) f(x) is strictly increasing on (-2, 1) ๏ (3, ๏ฅ) and strictly decreasing on (-๏ฅ , -2] ๏ [1, 3] .
(ii) f(x) is increasing on [-2, 1] ๏ [3, ๏ฅ) and decreasing on (-๏ฅ , -1] ๏ [1, 3].
14. -2 โ ๐ โ ๐ โ sin-1
โ ๐ + โ ๐ โ ๐ โ ๐ + C 15.
๐
๐
- log 2 OR 2โ ๐ - 2
17.
๐ ๐
๐
tan-1 x -
๐ ๐
๐
+
๐
๐
log |โ๐ + ๐ ๐| + C 18. โ
๐
๐+๐๐๐ (
๐+๐
๐
)
= x + C 19. โ
๐
โ ๐+ ๐ ๐
21. Quantity of food P = 15 packets, quantity of food Q = 20 packets and minimum amount of vitamin A
= 150 units.
22.
๐
๐๐
๐ถ๐น
๐
๐๐๐
23. 17x + 2y โ 7z โ 26 = 0
24. [
๐
๐
โ
๐
๐
๐
๐
โ๐ ๐ โ๐
๐
๐
โ
๐
๐
๐
๐
] 25. 2 sq. units OR
๐
๐
sq. units 26. X โ 2y + z = 0.
27. Unsolved practice Paper -9
Section A
1. Differentiate w.r.t. x: cos โ ๐ .
2. If A [
๐ ๐ ๐
๐ ๐ ๐
๐ ๐ ๐
] , then find An .
3. Find the magnitude and rectangular(or scalar ) components of the position vector of the point
( 3, -1 , 2 ).
4. Differentiate the following w.r.t. x: sin-1 (
๐๐
๐+ ๐ ๐).
5. The total cost C (x) in rupees , associated with the plantation of x trees is given by
C (x) = 0.007x3 โ 0.003x2 + 15x + 4000. Find the marginal cost when 17 trees are planted.
6. Evaluate : ๏ฒ sec x ( secx + tan x ) dx.
Section B
7. An Apache helicopter of enemy is fling along the curve given by y = x2 + 7. A soldier , placed at (3,7) ,
wants to shoot down the helicopter when it is nearest to him . Fine the distance .
8. Evaluate : โซ
๐+๐๐๐ ๐
๐+๐๐๐ ๐
dx .
9. Find the value of K so that ๏ฆ (x) = {
๐๐ ๐
๐๐ ๐ โค ๐
๐ ๐๐ ๐ > 2
is continuous at x = 2.
10. Evaluate : โซ
๐
๐+๐ ๐๐๐ ๐ ๐
dx .
11. If log (x2 + y2 ) = 2 tan-1 (
๐
๐
) , than prove that
๐ ๐
๐ ๐
=
๐+๐
๐โ๐
.
OR
If x = 2 cos ๏ฑ - cos 2๏ฑ and y = 2 sin ๏ฑ - sin 2๏ฑ , then prove that
๐ ๐
๐ ๐
= tan (
๐๏ฑ
๐
) .
12. Evaluate : โซ
๐
๐+๐๐๐ ๐
๐
๐
dx OR Evaluate : โซ โ ๐๐๐ ๐ ๐๐๐ ๐
๐
๐
๐
๐
dx.
13. If a, b, and c are three mutually perpendicular unit vector , that prove that |๐โโ + ๐โโ + ๐โ | = โ ๐ .
14. Solve : ๐ฌ๐ข๐งโ๐ ๐
๐๐
= ๐ฌ๐ข๐งโ๐
๐ โ ๐ฌ๐ข๐งโ๐ ๐
๐
OR
Solve : ๐ญ๐๐งโ๐ ๐๐
๐๐
= ๐ญ๐๐งโ๐ ๐
๐
โ ๐ญ๐๐งโ๐ ๏ฐ
๐
15. A stone is dropper into a quiet lake and waves move in a circle at a speed of 5cm/s. At the instant
when the radius of the circular wave is 8cm, how fast is the enclosed area increasing ? Like the store
, people throw garbage in the lake . Do you favour this type of act?
16. Find the area of the region bounded by the following curves : y = 1+| ๐ + ๐|; x = -2 ; x = 3 ; y = 0.
28. 17. One card is draw at random form a well โ shuffled deck of 52 cards . Let E : The cards drawn is a king
or queen, F : The card drawn is a queen or jack . Are the events E and independent?
OR
Three cards are drawn with replacement from a well โ shuffled pack of card . Find the probability
that
(i) the cards drawn are king , queen and jack respectively .
(ii) The cards drawn are king , queen and jack.
18. Find the particular solution of the differential equation
๐ ๐
๐ ๐
= ๐ + x2 + y2 +x2 y2 given that y = 1 when
x = 0.
19. If ( cos x )y = (cos y )x that find
๐ ๐
๐ ๐
.
Section C
20. Show that the lines
๐โ๐+๐
๐ถโ ๐น
+
๐โ๐
๐ถ
+
๐โ๐โ๐
๐ถ+ ๐น
and
๐โ๐+๐
๏ข โ ๐ธ
+
๐โ๐
๐ท
+
๐โ๐โ๐
๐ท+ ๐ธ
are coplanar .
21. There are two types of fertilisers , F1 and F2 , F1 consists of 10% nitrogen and 6% phosphoric acid
and F2 consists of 5% nitrogen and 10% phosphoricacid . After testing the soil conditions, a farmer
finds that he needs at least 14 kg of nitrogen and 14 kg of phosphoric acid for his crop . If F1 costs Rs.
6 per kg and F2 costs Rs. 5 per kg. determine how much of each type of fertiliser should be used so
that nutrient requirement are met at a minimum cost ? What is the minimum cost? Formulate the
above L.P.P . mathematically and then solve it graphically .
22. The given relation R is defined on the set of real number as a R b ๏ | ๐| ๏ฃ b. Fine whether the given
relation is reflexive ,symmetric and transitive.
OR
Show that the function ๏ฆ : N ๏ฎ N , given by ๏ฆ (x) = x (-1)x , is a bijection .
23. If A = [
๐ โ๐ ๐
๐ ๐ โ๐
๐ ๐ โ๐
] , then find A-1 . Using A2-1 ,solve the system of equations:
2x + 3y + z = 11 , -3x +2y + z = -5, 5x -4y โ 2z = 13.
24. Find the vector equation of the plane which is at a distance of
๐
โ๐๐
from the origin and its normal
from the origin is 2 ๐ฬ - 3๐ฬ + 4 ๐ฬ : also , find its Cartesian from.
25. Prove that |
๐ ๐ ๐
+ ๐๐ ๐ ๐
๐ ๐ ๐
+ ๐๐ ๐ ๐
๐ ๐ ๐
+ ๐๐ ๐ ๐
| = -( a โ b ) (b โ c ) ( c โ a ) ( a2 + b2 +c2 ).
26. In a factory machine a produced 30% of the total output , machine B produces 25% and machine C
prodxuces the remaining output . The defective items produces by machinery A, B and C are 1%,
29. 1.2% and 2% respectively . Three machines working together produce 10000 items in a day . An item
is drawn at random from a dayโs output and found to be defective . Fine the probability that it was
produced by machine B or C .
OR
A factory has three machine X,Y and Z producing 1000, 2000 and 3000 bolts per day respectively .
The machine X produces 1% defective bolts, Y produces 1.5% and Z produces 2% defective bolts . As
the end a day , a bolt is drawn at random and is found to be defective . What is the probability that
this defective bolt has been produced by machine X ?
ANSWER :-
1. โ
๐๐๐ โ ๐
๐โ ๐
2. [
๐ ๐
๐ ๐
๐ ๐ ๐
๐
๐ ๐ ๐ ๐
]
3. Magnitude is โ ๐๐ and rectangular (or scalar) components are 3, -1, 2. 4.
๐
๐+ ๐ ๐
5. Rs. 20.967 6. Tan x + sec x + C 7. โ ๐ units
8. x tan
๐
๐
+ C 9.
๐
๐
10.
๐
โ๐๐
๐ญ๐๐งโ๐
(
โ๐ ๐๐๐ ๐
โ๐
) + C
12. 2 OR
๐๐
๐๐๐
14.
๐๐
๐๐
OR โ
๐๐๐
๐
15. 80 ๏ฐ cm2 / s. No, I do not favour this type of act because it pollutes water which is an essential
Components for the survival of the living beings.
16.
๐๐
๐
sq. units 17. No OR (i)
๐
๐๐๐
, (ii)
๐
๐๐๐๐
18. Tan-1 y = x +
๐ ๐
๐
+
๐
๐
.
19.
๐๐๐ (๐๐๐ ๐๐+๐ ๐๐๐ ๐
๐๐๐ ( ๐๐๐ ๐)+ ๐ ๐๐๐ ๐
21. Quantity of fertilizer F1 = 100 kg, quantity of fertilizer F2 = 80 kg and minimum cost = Rs. 1000.
22. R is not reflexive, not symmetric but transitive.
23. A-1 = [
๐ ๐ โ๐
โ๐ ๐ โ๐๐
โ๐ ๐ โ๐๐
] , x = 13, y = -49, z = 132.
24. Vector form is ๐โ .( ๐๐ฬ โ ๐๐ฬ + ๐๐ฬ ) = 6 and Cartesian form is 2x โ 3y + 4z = 6.
26.
๐
๐
๐ถ๐น
๐
๐๐
.
30. Unsolved Practice Paper โ 6
Section A
1. Evaluate : โซ
๐ ๐ ๐ฌ๐ข๐งโ๐ ๐
โ ๐โ ๐ ๐
dx
2. Find the angle between two vector a and b with magnitude 1 and 2 respectively and |๐โโ ร ๐โโ |= โ ๐.
3. Evaluate : โซ ๐ ๐ ( ๐ + ๐) ๐๐๐ (๐๐ ๐
) dx .
4. Find the Cartesian equation of the plane ๐โ .[( ๐ โ ๐๐) ๐ฬ + ( ๐ โ ๐) ๐ฬ + ( ๐๐ + ๐) ๐ฬ] = 15.
5. Simplify : cos ๐ท [
๐๐๐ ๐ท ๐๐๐ ๐ท
โ ๐๐๐ ๐ท ๐๐๐ ๐ท
] + ๐๐๐ ๐ท [
๐๐๐ ๐ท โ ๐๐๐ ๐ท
๐๐๐ ๐ท ๐๐๐ ๐ท
] .
6. Find a vector of magnitude 5 units and parallel to resultants of the vectors ๐โโ = ๐๐ฬ + ๐๐ฬ โ ๐ฬ and
๐โโ = ๐ฬ โ ๐๐ฬ+ ๐ฬ.
Section B
7. The government is running a campaign โMAKE INDIA POLIO FREEโ To spread awareness in a particular
society ,it is displaying an air balloon with the above tag line printed on it. The balloon is in the from
of a right circular surmounted by a hemisphere , having a diameter equal to the height of the cone .
It is being inflated by a pump . How fast is its volume changing with respect to its total height h,
when h is 3 cm ? Do you thing we should work seriously towards polioeradication ? Write any
four values that been highlighted here.
8. If u = sin ( m cos-1 x ) and v = cos ( m sin-1 x ) , then prove that
๐ ๐
๐ ๐
= โ
๐โ ๐ ๐
๐โ ๐ ๐ .
OR
If y = โ ๐ +
๐
โ ๐
, then prove that 2x
๐ ๐
๐ ๐
= โ ๐ โ
๐
โ ๐
9. Evaluate : โซ [๐๐๐ ๐๐๐ ๐ +
๐
(๐๐๐ ๐) ๐] dx
10. If ๐โโ , ๐โโ ๐๐๐ ๐โ are three vectors such that ๐โโ + ๐โโ + ๐โ = ๐โโ and | ๐โโ | = 5, |๐โโ | = 12, | ๐โ | = 13, then find
๐โโ . ๐โโ + ๐โ . ๐โโ + ๐โ . ๐โโ .
11. Prove that : tan-1 ๐
๐
+ tan-1 ๐
๐
= ยฝ cos-1 ๐
๐
.
OR
If cos-1 ๐
๐
+ cos-1 ๐
๐
= ๏ก ,
๐ ๐
๐ ๐ โ
๐๐๐
๐๐
cos ๐ถ +
๐ ๐
๐ ๐ = sin2 ๏ก .
12. Find the coordinates of the point where the line through the points ( 3, -4 , -5 ) and ( 2,-3, 1) crosses
the plane 3x + 2y + z + 14 = 0 .
13. Using determinants , find the equation of the joining the point (1,2) and (3,6).
31. 14. Mother, father and son line up at random for a family picture .Determine P (E ๏ชF ) , where E /; son at
one end and F : father in the middle.
OR
An electronic assembly consists of two sub stems , say A and B . From previous testing procedures ,
the following probabilities are assumed to be known : P (A fails ) = 0.2 . ( B fail alone ) = 0.15 ,.
Evaluate the probabilities :
(i) P ( A fails ๏ช B has failed ) (ii) P ( A fails along )
15. Using probabilities of determinants , solve for x : |
๐ โ ๐ ๐๐ โ ๐ ๐๐ ๐
๐ โ ๐ ๐๐ โ ๐ ๐๐ โ ๐๐
๐ โ ๐ ๐๐ โ ๐๐ ๐๐ โ ๐๐
| = 0.
16. Check the applicability of (A) Rolleโs theorem (B) Lagrangeโs mean value theorem for ๏ฆ (x) = | ๐| on
[ -1 ,1 ].
OR
Check the applicability of (A) Rollโs theorem (B) Lagrangeโs mean value the theorem for ๏ฆ (x) = | ๐| on
[ 5,9 ] , where [x] is the greatest integer less than or equal to x.
17. Write A-1 for A = [
๐ ๐
๐ ๐
] .
18. From the differential equation representing the family of ellipses having foci on x โ axis and center
at the origin.
19. Evaluate : โซ ๐๐๐ ๐
๐ ๐ ๐ dx
Section C
20. Consider ๏ฆ : R+ ๏ฎ [ -5 , ๏ฅ ) given by ๏ฆ (x) = 9x2 + 6x โ 5 . Show that ๏ฆ is invertible with f-1 (y) =
โ๐+๐ โ ๐
๐
, where R+ is the set of all non โ negative real numbers.
21. Three bags contain balls as shown in the table below :
Bag No. of white Balls No. of Black Balls No. of Red Balls
I 1 2 3
II 2 1 1
III 4 3 2
A bag is chosen at random and two balls are drawn from it , They happen to be white and red .
What is probability that they came from the Bag III ?
OR
32. Three bags contain balls as shown in the table below:
Bag No. of white Balls No. of Black Balls No. of Red Balls
I 1 2 3
II 2 1 1
III 4 3 2
A bag is chosen at random and two balls are drawn from it with replacement. They happen to be
white and red . What is probability that they came from the Bag III ?
22. Evaluate : โซ
๐
( ๐+๐)(๐+ ๐ ๐ )
โ
๐
dx
23. Show that the surface area of a closed cuboids with the square base and given volume is minimum
when it is cube.
24. One king of cake requires 200 g of flour and 25 g of fat, and another kind of cake requires 100 g of
flour and 50 g of fat . Find the maximum number of cakes which can made from 5 kg of flour and 1 kg
of fat, assuming that there is no shortage of the other ingredients used in making the cakes.
Formulate the above L.P.P. mathematically and then solve it graphically .
25. Find the coordinates of the foot of the perpendicularand length of the perpendicular drawn from
the point P ( 5,4,2) to the line = - + 3j + k + ( 2 + 3j โ k ) . Also, find the image of P in the line .
26. The area between x = y2 and x = 4 , which is divided into two equal parts by the line x= a . Find the
value of a .
OR
Using integration , find the area of the triangular region whose sides have the equations
y = 2x + 1 , y = 3x + 1 and x = 4.
ANSWER :-
1.
๐ ๐ ๐ฌ๐ข๐งโ๐ ๐
๐
+ C 2. 600 3. โcos ( xex ) + C
4. ( s โ 2t ) x + ( 3 โ t ) y + (2s + t )z = 15 5. [
๐ ๐
๐ ๐
] OR I2
6.
๐
โ๐๐
( ๐๐ฬ + ๐ฬ)
7.
๐๐
๐
cm2 . Yes we should work seriously towards polio eradication. The value that have been
highlighted here are awareness , helping other , care and empathy for children.
9. x log log x โ
๐
๐๐๐ ๐
+ C 10. โ 169 12. (5,-6 ,- 17)
13. 2x โ y = 0 14. 1 OR (i) ยฝ (ii) 0.05 15. 4
16. (A) Rollโs theorem is not applicable , (B) Lagrange mean value theorem is not applicable
OR
33. (A) Rolleโs theorem is not applicable , (B) Lagrangeโs mean value theorem is not applicable .
17. [
๐ โ๐
โ๐ ๐
] 18. Xy
๐ ๐
๐
๐ ๐ ๐ + ๐ (
๐ ๐
๐ ๐
)
๐
โ ๐
๐ ๐
๐ ๐
= ๐
19.
๐๐๐ ๐
๐
๐
โ ๐๐๐ ๐+ ๐ + ๐ช 21.
๐
๐๐
OR
๐๐
๐๐๐
22.
๐
๐
24. Number of cakes of I kind = 20 , number of cakes of II kind = 10 and and maximum number of cakes
= 30.
25. (1, 6, 0) ; โ ๐๐ units; (-3, 8, -2) 26. (๐)
๐
๐ OR 8 sq. units