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

Electromagnetic -radiation means:

Question # 2

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

Question # 3

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 4

Photoelectrons are emitted when ultraviolet light falls on:

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 7

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 8

Victor de-Brogile received the Nobel prize in physics in

Question # 9

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 10

The Stephen-Boltzmann law for the black body radiation is given by

Question # 11

The Einstein's changes in length, mass and time are not observed in common life because

Question # 12

The length contraction happens only

Question # 13

When a position comes close to an electron they annihilate into

Question # 14

Strictly speaking, the earth is:

Question # 15

When a platinum wire is heated, it appears orange red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
2 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
3 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
4 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
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 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
7 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
8 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
9 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
10 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v

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