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

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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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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 concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
2	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
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	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
5	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
6	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
7	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
8	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
9	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
10	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴

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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

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

In photoelectric effect the energy of ejected electrons depend on

When a platinum wire is heated, it appears yellow at

Which of the following phenomenon proves the particle nature of light

The mass of an object will be doubled at speed

The special theory of relativity is based on the

Strictly speaking, the earth is:

Photocell is a device which converts

When a platinum wire is heated, it appears white at

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

Absolute motion cannot be detected

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

There is no way to detect:

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:

An inertial frame is that frame in which

According to the special theory of relativity, time is

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

If a material object moves with the speed of light 'C' its mass becomes

de-Broglies hypthesis was experimentally verified by

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

The concept of direction and position are purely

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

The photon of radio-waves has energy of about

Wien's constant is measured in:

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

The energy of a photon is represented by

The length contraction happens only

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

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ECAT Physics Chapter 19 Important MCQ's

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