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	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
2	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
3	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
4	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
5	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
6	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
7	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
8	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)
9	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
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

Photocell is a device which converts

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

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

The general theory of relativity treats problems involving

Electromagnetic radiation or photons interact with matter in

When a platinum wire is heated, it appears yellow at

A non-inertial frame of reference is one, in which

The length contraction happens only

The existence of position was predicted by Dirace in

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

At the temperature, a body emits radiation which is principally

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

Photoelectric effect takes place with a photon of:

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

When platinum wire is heated, it appears cherry red at

The unit of work function is:

Which of the following is not an example of intertial frame

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

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

Which of the following phenomenon proves the particle nature of light

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:

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

Pair production is the phenomenon in which

A photon is considered to have

The inside cavity of the black body is

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

According to the special theory of relativity, time is

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

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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