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 positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
2	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
3	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
4	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
5	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
6	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
7	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
8	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
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	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

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

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

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

Photoelectrons are emitted when ultraviolet light falls on:

Compton was awarded Nobel prize in physics in

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

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Compton shift refers to:

The mass of an object will be doubled at speed

Strictly speaking, the earth is:

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

Which of the following phenomenon proves the particle nature of light

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

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

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Electromagnetic -radiation means:

0.1 kg mass will be equivalent to the energy

the symbol to be used in relativity problems denotes:

The special theory of relativity is based on the

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 concept of direction is purely:

A non-inertial frame of reference is one, in which

The value of threshold frequency for different metals is

The energy of photon 'E' is proported to

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

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:

Which of the following is not an example of intertial frame

The energy of a photon is represented by

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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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