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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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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	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	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
3	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
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 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
6	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
7	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}
8	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
9	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
10	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero

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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

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

The length contraction happens only

When a platinum wire is heated, it appears white at

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:

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

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

When a position comes close to an electron they annihilate into

The special theory of relativity is based on:

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

According to the special theory of relativity, time is

Intensity of light determines the:

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

S.I. unit of planks constant is

The value of threshold frequency for different metals is

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

Max Planck received the Nobel Prize for his discovery of energy quants in:

Compton studied the scattering of x-rays by loosely bound electrons from:

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

The general theory of relativity treats problems involving

According to the de-Brogile relation, an object of large mass and ordinary speed has

An inertial frame is that frame in which

The energy of a photon is represented by

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

The existence of position was predicted by Dirace in

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

Which of the following is not an example of intertial frame

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 mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Photoelectric effect takes place with a photon of:

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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