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	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
3	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
4	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
5	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
6	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
7	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
8	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
9	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
10	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble

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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

Momentum is a parameter associated with

When a platinum wire is heated, it appears orange red at

The value of threshold frequency for different metals is

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

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

The inside cavity of the black body is

The general theory of relativity treats problems involving

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

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

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

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

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

The special theory of relativity treats problems invoving

When a platinum wire is heated, it appears white at

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

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

There is no way to detect:

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

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

Electromagnetic radiation or photons interact with matter in

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

Photocell is a device which converts

Davision and Germer performed experiment to verify

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

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

The existence of position was predicted by Dirace in

Photoelectric effect takes place with a photon of:

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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