Best NEET Coaching in Ranchi

बुद्धा साइन्स एंड टेक्निकल इंस्टीट्यूट
Buddha Science & Technical Institute
Kokar, Ranchi, Jharkhand
JOIN BSTI FOR : IIT-JEE / NEET With BHARAT SIR
PHYSICS : IMPORTANT QUESTION FOR IIT-JEE / NEET
Q. The following four wires are made of the same materials.
Which of these will have the largest extension, when
the same tension is applied ?
A. length = 50 cm , diameter = 0.5 mm
B. length = 100 cm , diameter = 1 mm
C. length = 200 cm , diameter = 2 mm
D. length = 300 cm , diameter = 3 mm
ANS : A
V.V.I.
QUESTION

Q. The pressure of a medium is changed from 1.01 x 105 Pa to 1.65 x
105 Pa and change in volume is 10% keeping temperature
constant. The bulk modulus of the medium is
A. 204.8 x 105 Pa B. 102.4 x 105 Pa
C. 51.2 x 105 Pa D. 1.55 x 105 Pa
ANS : D
V.V.I.
QUESTION

Q. A given quantity of an ideal gas is at pressure P and absolute
temperature T. The isothermal bulk modulus of the gas is
A. 2 P / 3
B. P
C. 3 P / 2
D. 2 P
ANS : B
V.V.I.
QUESTION

Q. A wire elongates by l mm when a load W is hanged from it. If the
wire goes over a pulley and two weights W each are hung at the two
ends, the elongation of the wire will be (in mm)
A. l / 2
B. l
C. 2 l
D. zero
ANS : B
V.V.I.
QUESTION

Q. A wire fixed at the upper end stretches by length l by applying a
force F. The work done in stretching is
A. F / 2l
B. Fl
C. 2Fl
D. Fl / 2
ANS : D
V.V.I.
QUESTION

Q. A wire suspended vertically from one of its ends is stretched by
attaching a weight of 200 N to the lower end. The weight stretches
the wire by 1 mm. Then the elastic energy stored in the wire is
A. 0.2 J
B. 10 J
C. 20 J
D. 0.1 J
ANS : D
V.V.I.
QUESTION

Q. In solids interatomic forces are
A. Totally repulsive
B. Totally attractive
C. Both (a) and (b)
D. None of these
ANS : C
V.V.I.
QUESTION

Q. The term liquid crystal refers to a state that is intermediate
between
A. Crystalline solid and amorphous liquid
B. Crystalline solid and vapour
C. Amorphous liquid and its vapour
D. A crystal immersed in a liquid
ANS : A
V.V.I.
QUESTION

Q. Which one of the following is not a unit of Young`s modulus?
A. Nm-1
B. Nm-2
C. Dyne cm-2
D. Mega pascal
ANS : A
V.V.I.
QUESTION

Q. There are two wires of same material and same length while the
diameter of second wire is two times the diameter of first wire,
then the ratio of extension produced in the wire by applying same
load will be
A. 1 : 1 B. 2 : 1
C. 1 : 2 D. 4 : 1
ANS : D
V.V.I.
QUESTION

Q. A wire of diameter 1 mm breaks under a tension of 1000 N. Another
wire, of same material as that of the first one, but of diameter 2 mm
breaks under a tension of
A. 500 N
B. 100 N
C. 1000 N
D. 4000 N
ANS : D
V.V.I.
QUESTION

Q. A cube is subjected to a uniform volume compression. If the side of
the cube decreases by 2%, the bulk strain is
A. 0.02
B. 0.03
C. 0.04
D. 0.06
ANS : D
V.V.I.
QUESTION

Q. The work done per unit volume in deforming a body is given by
A. stress x strain
B. 1 / 2 (stress x strain)
C. stress / strain
D. strain / stress
ANS : B
V.V.I.
QUESTION

Q. A body of weight mg is hanging on a string which extends in length
by l. The work done in extending the string is
A. mgl
B. mgl / 2
C. 2mgl
D. None of these
ANS : B
V.V.I.
QUESTION

Q. According to Hooke`s low of elasticity , if stress is increased, the
ratio of stress to strain
A. Increases
B. Decreases
C. Becomes zero
D. Remains constant
ANS : D
V.V.I.
QUESTION

Q. A thick copper rope of density 1.5 x 103 kgm-3 and Young`s modulus
5 x 106 Nm-2 , 8 m in length, when hung from the ceiling of a room,
the increase in its length due to its own weight is
A. 9.6 x 10-5 m B. 19.2 x 10-7 m
C. 9.6 x 10-2 m D. 9.6 m
ANS : C
V.V.I.
QUESTION

Q. The compressibility of water is 4 x 10-5 per unit atmospheric
pressure. The decrease in volume of 100 cm3 of water under a
pressure of 100 atmosphere will be
A. 0.4 cm3 B. 4 x 10-5 cm3
C. 0.025 cm3 D. 0.004 cm3
ANS : A
V.V.I.
QUESTION

Q. A stretched rubber has
A. Increased kinetic energy
B. Increased potential energy
C. Decreased kinetic energy
D. Decreased potential energy
ANS : B
V.V.I.
QUESTION

Q. The breaking stress of a wire depends upon
A. Length of the wire
B. Radius of the wire
C. Material of the wire
D. Shape of the cross-section
ANS : C
V.V.I.
QUESTION

Q. Which of the following affects the elasticity of a substance ?
A. Hammering and annealing
B. Change in temperature
C. Impurity in substance
D. All of these
ANS : D
V.V.I.
QUESTION

Q. Which of the following has no dimensions ?
A. Strain
B. Angular velocity
C. Momentum
D. Angular momentum
ANS : A
V.V.I.
QUESTION

Q. When a body of mass M is hung from a spring, the spring extends
by 1 cm. If the body of mass 2 M be hung from the same spring,
the extension of spring will be
A. 1 cm B. 2 cm
C. 0.5 cm D. 4 cm
ANS : B
V.V.I.
QUESTION

Q. According to C.E. van der Wall, the interatomic potential varies
with the average interatomic distance (R) as
A. R-1
B. R-2
C. R-4
D. R-6
ANS : D
V.V.I.
QUESTION

Q. A sphere of radius 3 cm is subjected to a pressure of 100 atm. Its
volume decreases by 0.3 c.c. . What will be its bulk modulus ?
A. 4π x 105 atm
B. 4π x 3 x 103 atm
C. 4π x 106 atm
D. 4π x 108 atm
ANS : B
V.V.I.
QUESTION

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