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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The value of the plank's constant 'h' is given by

Question # 2

Converse of pair production is known as

Question # 3

Compton was awarded Nobel prize in physics in

Question # 4

Newton's law of motion do not hold in

Question # 5

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

Question # 6

The mass of an object will be doubled at speed

Question # 7

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

Question # 8

Position was discovered by Carl Anderson in

Question # 9

Which of the following is not an example of intertial frame

Question # 10

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

Question # 11

Practically the quantity v/c is always:

Question # 12

The idea of quantization of energy was proposed by:

Question # 13

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

Question # 14

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

Question # 15

Absolute motion cannot be detected

Question # 16

Intensity of light determines the:

Question # 17

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

Question # 18

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

Question # 19

According to the special theory of relativity

Question # 20

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

Question # 21

An inertial frame is that frame in which

Question # 22

At the temperature, a body emits radiation which is principally

Question # 23

The year when A.H. compton was awarded Nobel Prize is:

Question # 24

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 25

The energy of the 4th orbit in hydrogen atom is

Question # 26

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

Question # 27

In photoelectric effect the energy of ejected electrons depend on

Question # 28

The concept of direction is purely:

Question # 29

From the theory of relativity, momentum p of the photon is related to energy as

Question # 30

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
4 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 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
7 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
8 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
9 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
10 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these

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