Photo electric effect is based upon..

Wed,August 7, 2019 01:53 AM

1. Example for conductor

a) copper
b) Plastic
c) wood
d) none

2. Relation between voltage & current

a) V= IR
b) R= VI
c) P=V x I
d) None

3. S.I Units for resistivity

a) - m

4. The angle of incidence is equal to the angle of reflection

a) always
b) sometimes
c) under special conditions
d) Never

5. The relation between centigrade scale and Fahrenheit scale is

a) C/100=F+32
b) C/100=(F-32)/100
c) C/100=(F-32)/180
d) None

6. latent Heat of vaporization of water is

a) 80 Cal/g
b) 540 cal/g
c) 100 cal/g
d) 120 cal/g

7. An object A at 100 C and another object B at 10K are kept in contact , them heat will flow from

a) B to A
b) A to B
c) both
d) none

8. kinetic energy is the energy possessed by it due to its

a) motion
b) position
c) rest
d) none

9. Which is correct for measuring nuclear radii

a) fermi
b) Deci
c) Micro
d) Parasec

10. Joule Sec stands for the unit of

a) gravitational constant
b) elasticity
c) Planks constant
d) momentum

11. Instruments which indicate the condition of humidity are called

a) hygrometer
b) hydrometer
c) hygroscope
d) thermometer

12. Mercury thermometer was invented by

a) Newton
b), Priestley
c) Fahrenheit
d) Galileo

13. The density of water varies with temperature which helps the aquatic animals to live in cold water. At what temperature is the density of water maximum?

a) 1C
b) 2C
c) 3C
d) 4C

14. On which one of the following conservative laws, does a rocket work?

a) Mass
b) Energy
c) Linear momentum
d) Angular momentum

15. Torr is the unit of physical quantity

a) Density
b) pressure
c) torque
b) None

16. Match list I with list II and select the correct answer using the codes given below the lists .

List I List II
A. Distance between
earth and stars I) Micron
B. Inter atomic distance
in a solid II) Angstrom
C. Size of the nucleus III) Light year
D. Wave length of
infrared laser IV) Fermi
a) V IV II I

17 The k.w.h=__ joules

a) 36x105 J
b) 37x105 J
c) 34x105 J
d) none

18. The period of a simple pendulum is doubled when

a) its length is doubled
b) the mass of the bob is doubled
c) its length is made four times
d) the mass of the bob and the length of the pendulum are doubled

19. Hookes law essentially defines

a) stress
b) strain
c) yield point
d) elastic limit

20. What is the fuel of suns energy

a) Hydrogen
b) helium
c) uranium
d) None of these

21. The hydraulic brakes used in automobiles is directly based on application of

a) Bernoullis theorem
b) Archimedes principle
c) Toricellian law
d) Pascals law

22. Pitch is characteristic of sound that depends upon its

a) intensity
b) frequency
c) quality
d) None of the above

23. Which one of the following is not correctly matched ?

a) Voltmeter- Potential difference
b) Potentiometer EMF
c) Ammeter Electric current
d) Metro bridge Electrical resistance

24. Velocity of a sound in a gas is proportional to

a) square root of isothermal elasticity
b) Adiabatic elasticity
c) Square root adiabatic elasticity
d) Isothermal elasticity

25. Kirchhoffs first law i.e. = o at a junation deals with the conservation of

a) charge
b) Energy
c) Momentum
d) Angular momentum

26. Function of A rectifier is

a) To convert Ac into DC
b) to convert DC in to AC
c) Both (a) & (b)
d) Neither (a) Nor (b)

27. The electromagnetic waves used in the telecommunication are

a) ultra violet
b) infra-red
c) visible
d) Micro wave

28. Units for universal gravitational constant

a) Nm2/kg2
b) NM2.Kg2
c) N/kg2
d) Nm/gm2

29. Which of the following laws of Newton apply to a person sitting on ice in still water

a) Third law
b) First law
c) Second law
d) None

30. If the Velocity of an object is increased four times, then its Kinetic energy will be

a) same as before
b) double
c) four times
d) sixteen times

31. Which instrument is used to measure strength of direct current ?

a) Stroboscope
b) Streoscope
c) Tangent Galvanometer
d) Tachometer

32. Intensity of gravitational field of the Earth is maximum at....

a) poles
b) equator
c) centre of Earth
d) surface

33. Which instrument is used to measure sound under water ?

a) Hygrometer
b) Hygroscope
c) Hypsometer
d) Hydrophone

34. K. Macmillan invented

a) Bicycle
b) Barometer
c) Calculating Machine
d) Centigrade Scale

35. Decibel is a term connected with

a) air
b) water
c) sound
d) soil

36. The working of the quartz crystal in the watch is based on

a) Jhonson effect
b) Photoelectric effect
c) Edison effect
d) Piezo electric effect

37. The gas used to extinguish fire is -

a) Neon
b) Nitrogen
c) Carbon dioxide
d) Carbon Monoxide

38. The first metal used by man was

a) iron
b) copper
c) gold
d) bronze

39. Freon Gas is used in

a) Air-conditioners
b) Refrigerators
c) Television
d) Nuclear reactors

40. At which temperature the centigrade and Fahrenheit scales are equal?

a) 40
b) -40
c) 37
d) 94.6

41. Fathom is unit of

a) sound
b) depth
c) distance
d) frequency

42. The reason of mirage is

a) interference of light
b) diffraction of light
c) polarisation of light
d) total internal reflection of light

43. A liquid drop tends to assume a spherical shape because of

a) surface tension
b) viscous force
c) gravitational force
d) centrifugal force

44. Erg = ____ joules

a) 10-7
b) 10-18
d) 10-6

45. 1 horse power = ___ watts

a) 74
b) 748
c) 746
d) 750

46. An object with a constant speed

a) is not accelerated
b) might be accelerated
c) is always accelerated
d) also has a constant velocity

47. The function of ball bearings in a wheel is?

a) to increase friction
b) to convert kinetic friction into rolling friction
c) to convert static friction into kinetic friction
d) just for convenience

48. Water from soil enters into the root hairs owing to

a) atmospheric pressure
b) capillary action
c) root pressure
d) none of the above

49. Marie and Pierre Curie invented

a) Radio
b) Radium
c) Radar
d) Refrigerator

50. Time taken to reach the maximum height is

a) time of discent
b) time of ascent
c) time of flight
d) none

51. Maximum height of a body will find by

a) h=u^2/g
b) h=u^2/2g
c) h=u/g
d) None

52. Semiconductor devices are of

a) Ge, Si, Ar
b) Au, Pt
c) Pb, Au
d) pt, gold

53. After applying & removing loads alternatively then the property is called

a) Elasticity
b) Elastic fatigue
c) Elastic after
d) Ductility

54. The good and pure type of semiconductor material can be known as.

a) forward bias
b) reverse bias
c) p-n junction
d) intrinsic semiconductor

55. The no. of divisions in a Fahrenheit scale

a) 120
b) 180
c) 145
d) 122

56. The nature of flow of fluids in a pipe due to ?

a) Buoyancy
b) Viscosity
c) Rigidity
d) Surface tension

57. The lift of an Aeroplane is based on

a) Torricellis theorem
b) Beroullis principle
c) law of gravitation
d) coloumbs law

58. In intrinsic semi-conductor at room temperature , number of electronics and holes are

a) equal
b) zero
c) unequal
d) infinite

59. Photo electric effect is based upon

a) Energy
b) Momentum
c) Charge
d) Mass

60. Mallikans oil drop experiment is based on

a) coloumbs law
b) Stokes law
c) Wiens law
d) Newtons law



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