ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

When a platinum wire is heated, it appears yellow at

Question # 2

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

Question # 3

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 4

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 # 5

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

Question # 6

The unit of work function is:

Question # 7

The energy of the 4th orbit in hydrogen atom is

Question # 8

The special theory of relativity is based on:

Question # 9

Absolute motion cannot be detected

Question # 10

0.1 kg mass will be equivalent to the energy

Question # 11

From the theory of relativity, momentum p of the photon is related to energy as

Question # 12

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 # 13

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 14

the dilation of time applies to the timing processes which are:

Question # 15

According to the special theory of relativity, time is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
2 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
3 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
4 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
5 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
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 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
8 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
9 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
10 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

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