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	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
2	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905
3	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
4	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
5	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
6	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
7	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
8	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
9	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. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
10	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all 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

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

Due to relative motion of observer and the frame of reference of events, time always:

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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 general theory of relativity treats problems involving

Compton shift refers to:

An inertial frame is that frame in which

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

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

A black body is

de-Broglies hypthesis was experimentally verified by

The energy of a photon is represented by

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

Photoelectrons are emitted when ultraviolet light falls on:

Momentum is a parameter associated with

Which of the following is not an example of intertial frame

The special theory of relativity is based on the

A photon is considered to have

The mass of an object will be doubled at speed

Pair production is the phenomenon in which

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

The positron was discovered by:

Absolute motion cannot be detected

Strictly speaking, the earth is:

In the compton's effect, it is found that the wavelength of incident x-rays is

According to the Max plank, energy is redialed or absorbed in

When a platinum wire is heated, it appears yellow at

Practically the quantity v/c is always:

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

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