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

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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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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	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
3	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
4	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
5	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
6	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
7	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
8	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
9	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
10	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

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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

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

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The special theory of relatively treats the problems involving:

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

The concept of direction and position are purely

The special theory of relativity treats problems invoving

Intensity of light determines the:

The photon of radio-waves has energy of about

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

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Pair production is the phenomenon in which

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

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

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

The idea of quantization of energy was proposed by:

The inside cavity of the black body is

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

S.I. unit of planks constant is

At the temperature, a body emits radiation which is principally

There is no way to detect:

Which of the following is not an example of intertial frame

When a platinum wire is heated, it appears yellow at

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

The special theory of relativity is based on the

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

According to the special theory of relativity

Wave nature of particle was proposed by

the dilation of time applies to the timing processes which are:

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ECAT Physics Chapter 19 Important MCQ's

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