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 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
2	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
3	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
4	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
5	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
6	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
7	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
8	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
9	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
10	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

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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 special theory of relativity is based on:

The special theory of relatively treats the problems involving:

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

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

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

Compton was awarded Nobel prize in physics in

According to the special theory of relativity, a moving clock

0.1 kg mass will be equivalent to the energy

According to the special theory of relativity, time is

When a platinum wire is heated, it appears white at

Electromagnetic -radiation means:

The special theory of relativity treats problems invoving

A photon is considered to have

The energy of photon 'E' is proported to

Davision and Germer performed experiment to verify

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

Momentum is a parameter associated with

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

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

When the atomic particle are moving with velocities approaching that of light:

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

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

The photon of radio-waves has energy of about

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The general theory of relativity treats problems involving

When a position comes close to an electron they annihilate into

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

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

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ECAT Physics Chapter 19 Important MCQ's

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