ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

Question # 2

The inside cavity of the black body is

Question # 3

According to the Max plank, energy is redialed or absorbed in

Question # 4

The special theory of relativity is based on:

Question # 5

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 6

When a position comes close to an electron they annihilate into

Question # 7

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 8

Which of the following phenomenon proves the particle nature of light

Question # 9

The general theory of relativity treats problems involving

Question # 10

Strictly speaking, the earth is:

Question # 11

de-Broglies hypthesis was experimentally verified by

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

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

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 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
2 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
3 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
4 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
5 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
7 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
8 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
9 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
10 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2

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