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

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

Question # 2

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

Question # 3

The special theory of relativity treats problems invoving

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 6

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

Question # 7

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 8

The value of the plank's constant 'h' is given by

Question # 9

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

Question # 10

The year when A.H. compton was awarded Nobel Prize is:

Question # 11

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 12

The length contraction happens only

Question # 13

According to the special theory of relativity

Question # 14

The energy of the 4th orbit in hydrogen atom is

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
3 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
5 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
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
8 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
9 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 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

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