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

  • Total Questions30

  • Time Allowed30

Start Test Download PDF

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

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

Question # 2

Davision and Germer performed experiment to verify

Question # 3

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

Question # 4

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

Question # 5

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 # 6

The inside cavity of the black body is

Question # 7

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

Question # 8

When platinum wire is heated, it appears cherry red at

Question # 9

A photon is considered to have

Question # 10

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

Question # 11

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 12

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 13

Absolute motion cannot be detected

Question # 14

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

Question # 15

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

Question # 16

Photoelectric effect takes place with a photon of:

Question # 17

There is no way to detect:

Question # 18

Momentum is a parameter associated with

Question # 19

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

Question # 20

de-Broglies hypthesis was experimentally verified by

Question # 21

According to the special theory of relativity, a moving clock

Question # 22

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

Question # 23

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

Question # 24

Pair production is the phenomenon in which

Question # 25

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

Question # 26

Position was discovered by Carl Anderson in

Question # 27

The energy of photon 'E' is proported to

Question # 28

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

Question # 29

In order to produce pair production, a photon must have a energy

Question # 30

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

Submit

Prepare Complete Set Wise ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQs Online With Answers


Topic Test

00:00
Submit

Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

  • A
    Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
  • S
    shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
  • K
    khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
  • A
    Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
  • A
    Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
  • W
    Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
  • Z
    Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
  • M
    maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
2 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
3 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
4 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
5 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
8 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
9 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
10 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo

Test Questions