ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

The unit of work function is:

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 energy of a photon is represented by

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

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

Question # 6

Photoelectric effect takes place with a photon of:

Question # 7

When a platinum wire is heated, it appears yellow at

Question # 8

With the help of 50 K v electron microscope, a resolution of

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

An intertial frame of reference is a frame of reference which is

Question # 14

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 # 15

When the atomic particle are moving with velocities approaching that of light:

Question # 16

Momentum is a parameter associated with

Question # 17

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

Question # 18

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 19

When a platinum wire is heated, it appears white at

Question # 20

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

Question # 21

There is no way to detect:

Question # 22

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 23

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 # 24

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

Question # 25

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

Question # 26

Newton's law of motion do not hold in

Question # 27

An inertial frame is that frame in which

Question # 28

Compton was awarded Nobel prize in physics in

Question # 29

When a platinum wire is heated, it appears dull red at about

Question # 30

G.P. Thomson observer experimentally that electrons and neutrons possess

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
2 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
4 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
5 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
6 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
7 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
8 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
10 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

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