ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
2	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
3	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
4	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
5	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
6	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
7	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
8	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
9	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
10	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

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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 mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

According to the special theory of relativity

With the help of 50 K v electron microscope, a resolution of

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

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

The length contraction happens only

Strictly speaking, the earth is:

The special theory of relativity treats problems invoving

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:

G.P. Thomson observer experimentally that electrons and neutrons possess

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

As the light shines on the metal surface, the electrons are ejected

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

The positron was discovered by:

Compton shift refers to:

The general theory of relativity treats problems involving

When platinum wire is heated, it appears cherry red at

Photocell is a device which converts

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

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

The energy of a photon is represented by

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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

Wave nature of particle was proposed by

Compton was awarded Nobel prize in physics in

In photoelectric effect the energy of ejected electrons depend on

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be