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

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

Question # 2

Pair production is the phenomenon in which

Question # 3

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

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

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

Question # 7

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

Question # 8

When a position comes close to an electron they annihilate into photons such that

Question # 9

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

Question # 10

The energy of the 4th orbit in hydrogen atom is

Question # 11

Practically the quantity v/c is always:

Question # 12

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 13

If a material object moves with the speed of light 'C' its mass becomes

Question # 14

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 15

The unit of work function is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 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
3 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
4 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
5 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
6 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
7 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
8 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
9 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
10 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these

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