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	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
2	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
3	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
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	A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
7	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
8	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
9	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
10	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford

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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 special theory of relativity is based on:

Photoelectric effect takes place with a photon of:

The unit of work function is:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

Victor de-Brogile received the Nobel prize in physics in

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Electromagnetic radiation or photons interact with matter in

The inside cavity of the black body is

the symbol to be used in relativity problems denotes:

The existence of position was predicted by Dirace in

According to the Max plank, energy is redialed or absorbed in

A black body is

When platinum wire is heated, it appears cherry red at

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

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

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

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

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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

When the atomic particle are moving with velocities approaching that of light:

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

According to the special theory of relativity, a moving clock

Electromagnetic -radiation means:

Max Planck received the Nobel Prize for his discovery of energy quants in:

de-Broglies hypthesis was experimentally verified by

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

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

According to the special theory of relativity, time is

The special theory of relatively treats the problems involving:

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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: