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	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
2	As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:	A. Smaller B. Lerger C. Same D. Much larger
3	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
4	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
5	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
6	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
7	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
8	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
9	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}
10	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928

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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

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Compton was awarded Nobel prize in physics in

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

The idea of quantization of energy was proposed by:

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

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

the dilation of time applies to the timing processes which are:

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

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

Photoelectrons are emitted when ultraviolet light falls on:

Intensity of light determines the:

The mass of an object will be doubled at speed

Due to relative motion of observer and the frame of reference of events, time always:

The positron was discovered by:

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

Compton shift refers to:

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

Newton's law of motion do not hold in

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

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

The energy of the 4th orbit in hydrogen atom is

S.I. unit of planks constant is

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

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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

The length contraction happens only

An inertial frame is that frame in which

The Stephen-Boltzmann law for the black body radiation is given 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: