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	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
2	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
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	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
5	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
6	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
7	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
8	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
9	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
10	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light

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

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

The general theory of relativity treats problems involving

The energy of photon 'E' is proported to

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

In photoelectric effect the energy of ejected electrons depend on

The special theory of relativity is based on the

The special theory of relatively treats the problems involving:

When a position comes close to an electron they annihilate into

the symbol to be used in relativity problems denotes:

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

The unit of work function is:

There is no way to detect:

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

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

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

0.1 kg mass will be equivalent to the energy

Converse of pair production is known as

Compton was awarded Nobel prize in physics in

de-Broglies hypthesis was experimentally verified by

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

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

Photoelectric effect takes place with a photon of:

The idea of quantization of energy was proposed by:

Practically the quantity v/c is always:

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

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

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ECAT Physics Chapter 19 Important MCQ's

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