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

Practically the quantity v/c is always:

Question # 2

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 3

The special theory of relativity is based on:

Question # 4

The nature of radiations emitted by a hot body depends upon its:

Question # 5

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 6

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 7

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 8

Photocell is a device which converts

Question # 9

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

Question # 10

Wien's constant is measured in:

Question # 11

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

Question # 12

Intensity of light determines the:

Question # 13

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

Question # 14

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

Question # 15

The general theory of relativity treats problems involving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
2 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
3 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
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 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
6 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
7 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
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 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
10 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these

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