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

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
2	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
3	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
4	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
5	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)
6	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
7	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
8	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
9	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
10	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923

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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 energy of photon 'E' is proported to

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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

Newton's law of motion do not hold 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:

A black body is

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

The special theory of relativity treats problems invoving

The unit of work function is:

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

Pair production is the phenomenon in which

The existence of position was predicted by Dirace in

Victor de-Brogile received the Nobel prize in physics in

According to the special theory of relativity, a moving clock

The special theory of relativity is based on the

According to the special theory of relativity, time is

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

Compton was awarded Nobel prize in physics in

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

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

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

The idea of quantization of energy was proposed by:

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Practically the quantity v/c is always:

When platinum wire is heated, it appears cherry red at

The special theory of relativity is based on:

de-Broglies hypthesis was experimentally verified by

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ECAT Physics Chapter 19 Important MCQ's

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