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 value of the Stephen's constant for black body radiations is given by

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

The energy of the 4th orbit in hydrogen atom is

Question # 4

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 # 5

A non-inertial frame of reference is one, in which

Question # 6

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

Question # 7

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 # 8

Practically the quantity v/c is always:

Question # 9

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 10

Electromagnetic -radiation means:

Question # 11

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

Question # 12

0.1 kg mass will be equivalent to the energy

Question # 13

de-Broglies hypthesis was experimentally verified by

Question # 14

Which one of the following physical quantities changes with relativistic speed

Question # 15

Strictly speaking, the earth is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
2 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
3 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
4 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 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
6 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
7 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
8 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
9 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
10 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these

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