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

Victor de-Brogile received the Nobel prize in physics in

Question # 2

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

Absolute motion cannot be detected

Question # 4

The idea of quantization of energy was proposed by:

Question # 5

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

Question # 6

Intensity of light determines the:

Question # 7

Strictly speaking, the earth is:

Question # 8

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

Question # 9

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 10

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 11

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

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

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 14

The mass of an object will be doubled at speed

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
3 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
4 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
5 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
6 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
7 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
8 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
9 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
10 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C

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