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

A non-inertial frame of reference is one, in which

Question # 2

0.1 kg mass will be equivalent to the energy

Question # 3

The special theory of relativity treats problems invoving

Question # 4

The special theory of relatively treats the problems involving:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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 # 9

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 10

When a platinum wire is heated, it appears orange red at

Question # 11

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 12

The general theory of relativity treats problems involving

Question # 13

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 14

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

Question # 15

A black body is

Question # 16

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

Question # 17

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

Question # 18

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 19

The length contraction happens only

Question # 20

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

Question # 21

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 # 22

the symbol to be used in relativity problems denotes:

Question # 23

Photocell is a device which converts

Question # 24

Compton was awarded Nobel prize in physics in

Question # 25

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

The unit of work function is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
4 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
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 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
8 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
9 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
10 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C

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