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

The unit of work function is:

Question # 2

The idea of quantization of energy was proposed by:

Question # 3

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

Question # 4

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

Question # 5

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 6

In order to produce pair production, a photon must have a energy

Question # 7

S.I. unit of planks constant is

Question # 8

Electromagnetic radiation or photons interact with matter in

Question # 9

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

Question # 10

The inside cavity of the black body is

Question # 11

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 12

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

Question # 13

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 # 14

Davision and Germer performed experiment to verify

Question # 15

When a platinum wire is heated, it appears yellow at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
3 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
4 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
5 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
8 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
9 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
10 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

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    hasnain

    30 May 2018

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