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 existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
2	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
3	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
4	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
5	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
6	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
7	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
8	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
9	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
10	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}

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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

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

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

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

Wave nature of particle was proposed by

Which of the following is not an example of intertial frame

Pair production is the phenomenon in which

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

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

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

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 particle having mass and charge equal to that of an electron is called:

The special theory of relatively treats the problems involving:

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

The value of threshold frequency for different metals is

When a platinum wire is heated, it appears dull red at about

The special theory of relativity treats problems invoving

According to the special theory of relativity, time is

S.I. unit of planks constant is

Converse of pair production is known as

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

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 emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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

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

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

Photoelectric effect takes place with a photon of:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

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

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ECAT Physics Chapter 19 Important MCQ's

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