ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	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
2	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
3	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
4	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
5	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
6	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
8	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
9	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
10	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

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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

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

There is no way to detect:

In photoelectric effect the energy of ejected electrons depend on

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

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

Newton's law of motion do not hold in

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

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

Compton shift refers to:

The photon of radio-waves has energy of about

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

Davision and Germer performed experiment to verify

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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

Strictly speaking, the earth is:

When a platinum wire is heated, it appears white at

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

The Einstein's changes in length, mass and time are not observed in common life because

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

The positron was discovered by:

Which of the following phenomenon proves the particle nature of light

Absolute motion cannot be detected

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

The existence of position was predicted by Dirace in

Photoelectric effect takes place with a photon of:

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

de-Broglies hypthesis was experimentally verified by

Intensity of light determines the:

The special theory of relativity is based on:

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

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