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 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
2	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
3	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)
4	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
5	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
6	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
7	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
8	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
9	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:	A. Smaller B. Lerger C. Same D. Much larger
10	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume

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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

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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

The concept of direction and position are purely

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

An intertial frame of reference is a frame of reference which is

There is no way to detect:

Absolute motion cannot be detected

The special theory of relativity treats problems invoving

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

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

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

The photon of radio-waves has energy of about

Photocell is a device which converts

Davision and Germer performed experiment to verify

S.I. unit of planks constant is

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

de-Broglies hypthesis was experimentally verified by

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

Pair production is the phenomenon in which

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Compton was awarded Nobel prize in physics in

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

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

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:

A photon is considered to have

Newton's law of motion do not hold in

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