ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

At the temperature, a body emits radiation which is principally

Question # 2

Practically the quantity v/c is always:

Question # 3

Which of the following is not an example of intertial frame

Question # 4

Which of the following phenomenon proves the particle nature of light

Question # 5

With the help of 50 K v electron microscope, a resolution of

Question # 6

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 7

A non-inertial frame of reference is one, in which

Question # 8

A black body is

Question # 9

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 10

Photocell is a device which converts

Question # 11

When the atomic particle are moving with velocities approaching that of light:

Question # 12

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 13

Davision and Germer performed experiment to verify

Question # 14

Converse of pair production is known as

Question # 15

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
2 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
3 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
4 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
5 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
8 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
9 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
10 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson

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  • hasnain

    hasnain

    30 May 2018

    no

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