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	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
2	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
3	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
4	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
5	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
6	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
7	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
8	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
9	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
10	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C

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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

Newton's law of motion do not hold in

Wien's constant is measured in:

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

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

the symbol to be used in relativity problems denotes:

The special theory of relativity is based on:

When platinum wire is heated, it appears cherry red at

The general theory of relativity treats problems involving

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

The nature of radiations emitted by a hot body depends upon its:

Victor de-Brogile received the Nobel prize in physics in

The length contraction happens only

When a platinum wire is heated, it appears yellow at

The special theory of relativity is based on the

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

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

Wave nature of particle was proposed by

0.1 kg mass will be equivalent to the energy

In photoelectric effect the energy of ejected electrons depend on

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

According to the special theory of relativity

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

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

Converse of pair production is known as

When a position comes close to an electron they annihilate into photons such that

Compton shift refers to:

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

When a platinum wire is heated, it appears white at

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: