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

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Question # 1

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 2

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 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

Question # 4

Practically the quantity v/c is always:

Question # 5

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

Question # 6

Position was discovered by Carl Anderson in

Question # 7

As the light shines on the metal surface, the electrons are ejected

Question # 8

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

Question # 9

Electromagnetic -radiation means:

Question # 10

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 # 11

Electromagnetic radiation or photons interact with matter in

Question # 12

The special theory of relatively treats the problems involving:

Question # 13

The special theory of relativity is based on:

Question # 14

An inertial frame is that frame in which

Question # 15

The general theory of relativity treats problems involving

Question # 16

Intensity of light determines the:

Question # 17

When a position comes close to an electron they annihilate into

Question # 18

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 19

The concept of direction and position are purely

Question # 20

Momentum is a parameter associated with

Question # 21

If a material object moves with the speed of light 'C' its mass becomes

Question # 22

0.1 kg mass will be equivalent to the energy

Question # 23

The mass of an object will be doubled at speed

Question # 24

The existence of position was predicted by Dirace in

Question # 25

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 26

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

Question # 27

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

Question # 28

Compton shift refers to:

Question # 29

According to the special theory of relativity, a moving clock

Question # 30

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
2 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
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 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
7 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
8 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
9 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
10 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

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