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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
2	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
3	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
4	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
5	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
6	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
7	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
8	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
9	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
10	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

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

Absolute motion cannot be detected

According to the special theory of relativity

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

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

The unit of work function is:

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Wien's constant is measured in:

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

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

If a material object moves with the speed of light 'C' its mass becomes

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

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

Converse of pair production is known as

When a platinum wire is heated, it appears orange red at

Electromagnetic radiation or photons interact with matter in

A black body is

0.1 kg mass will be equivalent to the energy

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

Position was discovered by Carl Anderson in

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

The energy of a photon is represented by

Which of the following is not an example of intertial frame

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

Davision and Germer performed experiment to verify

There is no way to detect:

Which of the following phenomenon proves the particle nature of light

The mass of an object will be doubled at speed

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