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# 2nd preliem physics grade x

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### 2nd preliem physics grade x

1. 1. AL-HUDA SCHOOLCampus III (Boys Section)2ndPreliminary Examination 2012-2013PhysicsGrade XName: _________________________________Date:____________Time: 30 minutes Max. Marks: 17SECTION “A” (COMPULSORY)(MULTIPLE CHOICE QUESTIONS)Instruction: This paper of Physics (Theory) (Class X – New Model) consists of twoseparate question papers; the first paper (Section “A”) consists ofM.C.Q’s. This paper of 30 minutes duration will be given to you first of alland collected back as soon the time is over. Then you will be given thenext paper of 2 ½ Hours consisting of short-Answer Questions (SectionB”) and detailed-Answer Questions (Section “C”)General Instruction:Section A: This section consists of 17 Multiple Choice Questions (M.C.Q’s) and allare to be answered.Section B: This section consists of 21 short answer questions out of which 14 are tobe answered.Section C: This section consists of 3 detailed answer questions out of which 2questions are to be answered.SECTION „A‟ MULTIPLE CHOICE QUESTION (MCQ‟s)1. Choose the correct answer for each from the given options: (17)i. 1 joule is equal toa) 1 N-S b) 1lb-m c) 1N-mii. Power is define asa) Rate of change of position b) rate of change of force c) time rate of doing workiii. A __________________ is a simple machinea) First b) second c) thirdiv. Elasticity of the substance depends on itsa) Temperature b) size c) naturev. Random motion of the molecule in a fluid was first discovered bya) Robert Boyle b) Robert Brown c) Newtonvi. The temperature of a substance changes from -20C to 20C. What is the temperaturechange in Kelvin’s scale?a) 0K b) 20K c) 40K d)293K e) 400K
2. 2. vii. Mercury is commonly used as the working liquid in laboratory thermometer because ita) Has a high freezing point b) has a density c) is a liquid metal d) is silverye) expands evenly and proportionally when heated.viii. In transverse waves the distance between two consecutive crest or between twoconsecutive trough is calleda) Displacement b) wavelength c) velocity d) speedix. Speed of sound in air at normal temperature pressure(NTP)a) 336 b)672 c)712 d)785x. The image formed in a plane mirror isa) Real b) inverted c) virtual and erect d) real and invertedxi. When a ray of light enters obliquely from a rare into denser medium then the angle ofrefraction is ______________angle of incidence.a) Grater then b) smaller then c) equal to d)unrelated toxii. According to Quantum theory of light photons are ________________.a) Waves b) electromagnetic waves c) energy packets d) particlesxiii. Electromagnetic waves carriesa) Wave length b) frequency c) charge d) energyxiv. The lightest particle in atom isa) Neutron b) proton c)deuteron d) electronxv. One mega ohm resistance is equal to ______________ohma) 106b) 10-6c)108d)102e)10-8xvi. A galvanometer can be converted into an ammeter is always connecteda) In series b) in parallel c) in any way d)parallel to voltmeterxvii. A P-type substance is formed when a semiconductor crystal is doped witha________________ element.a) Divalent b) tetravalent c) Pentavalent d) trivalent
3. 3. SECTION „B‟ (SHORTH – ANSWER QUESTIONS)Time: 2 ½ Hours Max. Marks: 68Note: Answer any 14 questions from this section. No answer should exceed 3 to 5sentences.2. Write down the difference between each of the following with respect to definitionand formulaa) Kinetic energy and potential energy b) work and power3. Define a machine and name six simple machines. Prove that the mechanicaladvantage of an inclined plane is h/L =sinθ.4. Define evaporation and describe the factors on which evaporation depends.5. If 117.6 joule of heat is required to raise the temperature of 10gm of silverthrough 50C, calculate the specific heat of silver.6. Define electric field. Draw a diagram showing the electric field.7. Calculate the kinetic energy of an object of mass 4kg moving with velocity of10m/sec.8. Define the following terms a) hooks law b) Archimedes principle c) transistor9. Draw the image formed by a convex mirror and describe its characteristics (theobject may be placed at any point)10.State Boyle’s law and Charles law and derive the general gas equation.11.Define wheel and Axle and determine its mechanical advantage.12.What is the current through a conductor with resistance of 10ohms when thepotential difference across it is 120volt?13.Define galvanometer? How it is converted into ammeter?14.Define spectrum and describe the wave of which an electromagnetic spectrumconsists?15.State the following a) Snell’s law b) Ohms law c) Coulomb’s law16.The focal length of a concave mirror is 10cm.where should an object to be placedso as to get its real image magnified twice?17.Define law of heat exchange? Also write the difference between heat andtemperature.18.Find the formula of young Modulus with the help of Hooks law?19.What is focal length? Draw a ray diagram showing focal length of an image?20.What is an electric motor? Write the factors on which the speed of an electricmotor depends?
4. 4. 21.Name two main defects of human eye. Show the defects and their correctiondevices with the help of ray diagram?22.Define the following a) real and virtual image b) alternating current and directcurrent.Section C (detail questions)Attempt any two questions from the following. Each question carries equalmarks.23.a) Define simple harmonic motion and explain it with an example and diagram ofa pendulum?b) Write the two point of difference between the following i) forward bias andreverse bias ii) beta rays and gamma raysc) What is radar? Write down its two uses?24.a) Define wave length and frequency? Derive the equation V= f λb) define the following a) Coulomb b) Daniel cell c) solenoidc) Describe hydrogen bomb? Explain the reaction occur in this process?25.a) Write the difference between transverse waves and longitudinal waves? Drawa diagram showing both waves?b) Write the difference between the following a) musical sound and noise b) rarefaction and compressionc) Write the difference between the following a) P-type and N-type substance b)fission reaction and fusion reaction.