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 whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
2	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
3	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
4	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
5	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
6	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
7	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)
8	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
9	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
10	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

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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

Photoelectrons are emitted when ultraviolet light falls on:

Pair production is the phenomenon in which

Photoelectric effect takes place with a photon of:

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

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

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

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

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

The energy of a photon is represented by

Photocell is a device which converts

Position was discovered by Carl Anderson in

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

At the temperature, a body emits radiation which is principally

A photon is considered to have

The photon of radio-waves has energy of about

The Einstein's changes in length, mass and time are not observed in common life because

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

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

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

Which one of the following physical quantities changes with relativistic speed

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

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

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

An inertial frame is that frame in which

The special theory of relativity is based on:

The inside cavity of the black body is

From the theory of relativity, momentum p of the photon is related to energy as

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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