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	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
2	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
3	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
4	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)
5	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
6	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
7	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
8	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
9	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
10	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr

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

Which of the following phenomenon proves the particle nature of light

The concept of direction and position are purely

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

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:

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

Intensity of light determines the:

The value of threshold frequency for different metals is

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

The special theory of relativity treats problems invoving

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

the dilation of time applies to the timing processes which are:

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

Pair production is the phenomenon in which

When a position comes close to an electron they annihilate into

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

The Stephen-Boltzmann law for the black body radiation is given by

Converse of pair production is known as

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 energy of photon 'E' is proported to

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

Photocell is a device which converts

At the temperature, a body emits radiation which is principally

The special theory of relativity is based on the

The energy of a photon is represented by

The positron was discovered by:

S.I. unit of planks constant is

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

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