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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 2

When a position comes close to an electron they annihilate into

Question # 3

The concept of direction is purely:

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

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 # 6

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

Question # 7

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 8

The energy of photon 'E' is proported to

Question # 9

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 10

The idea of quantization of energy was proposed by:

Question # 11

The special theory of relativity is based on the

Question # 12

Electromagnetic radiation or photons interact with matter in

Question # 13

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

Question # 14

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

Question # 15

The value of threshold frequency for different metals is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
2 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
3 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
4 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
5 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
6 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 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

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