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 mass of an object will be doubled at speed

Question # 2

S.I. unit of planks constant is

Question # 3

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 4

The general theory of relativity treats problems involving

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 7

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 8

When a position comes close to an electron they annihilate into photons such that

Question # 9

Position was discovered by Carl Anderson in

Question # 10

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

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

According to the Max plank, energy is redialed or absorbed in

Question # 13

Victor de-Brogile received the Nobel prize in physics in

Question # 14

Photoelectrons are emitted when ultraviolet light falls on:

Question # 15

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
2 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
3 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
4 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
5 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
8 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
9 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
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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