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

Electromagnetic radiation or photons interact with matter in

Question # 2

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 3

Strictly speaking, the earth is:

Question # 4

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 5

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 # 6

Wien's constant is measured in:

Question # 7

The positron was discovered by:

Question # 8

The idea of quantization of energy was proposed by:

Question # 9

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

Question # 10

A particle having mass and charge equal to that of an electron is called:

Question # 11

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 12

The concept of direction and position are purely

Question # 13

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

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
2 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
3 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
4 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
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
7 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
8 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
9 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
10 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m

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