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 dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
2	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
3	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
4	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
5	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
6	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	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
8	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
9	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
10	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

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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

There is no way to detect:

The value of threshold frequency for different metals is

According to the special theory of relativity, time is

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

Absolute motion cannot be detected

Wien's constant is measured in:

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

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 concept of direction is purely:

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

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

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

Compton shift refers to:

When a platinum wire is heated, it appears white at

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

The existence of position was predicted by Dirace in

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

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

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

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

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

Davision and Germer performed experiment to verify

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

The value of the Stephen's constant for black body radiations is given by

The special theory of relatively treats the problems involving:

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

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

0.1 kg mass will be equivalent to the energy

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be