ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 2

The general theory of relativity treats problems involving

Question # 3

Practically the quantity v/c is always:

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 6

When a platinum wire is heated, it appears white at

Question # 7

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 8

Wave nature of particle was proposed by

Question # 9

Due to relative motion of observer and the frame of reference of events, time always:

Question # 10

A black body is

Question # 11

The value of the plank's constant 'h' is given by

Question # 12

The special theory of relativity is based on:

Question # 13

When a platinum wire is heated, it appears dull red at about

Question # 14

Photoelectrons are emitted when ultraviolet light falls on:

Question # 15

Photocell is a device which converts

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
2 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
3 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
4 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
5 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
6 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these

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