# Photo electric effect is based upon..

Wed,August 7, 2019 01:53 AM

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

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

a) - m
b)
c)
d)

## 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

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

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

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

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

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

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

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

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 B C D
a) V IV II I
b) III II IV I
c) V II IV III
d) III IV I II

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

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

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)

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

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

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

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

## 34. K. Macmillan invented

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

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

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

## 39. Freon Gas is used in

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

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

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

a) 10-7
b) 10-18
c)10-9
d) 10-6

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

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

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

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

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

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

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 252
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