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 value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
2	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
3	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
4	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
5	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
6	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
7	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
8	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
9	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
10	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)

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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

A photon is considered to have

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

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

Compton shift refers to:

Pair production is the phenomenon in which

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

Which one of the following physical quantities changes with relativistic speed

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

Absolute motion cannot be detected

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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

If a body reaches a speed equal to the speed of light, then its mass will became

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 value of threshold frequency for different metals is

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

The mass of an object will be doubled at speed

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

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

The length contraction happens only

The general theory of relativity treats problems involving

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

A black body is

S.I. unit of planks constant is

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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

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

An inertial frame is that frame in which

Newton's law of motion do not hold in

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

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ECAT Physics Chapter 19 Important MCQ's

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