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	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
3	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
4	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
5	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
6	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
7	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
8	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
9	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
10	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

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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 energy of the 4th orbit in hydrogen atom is

Momentum is a parameter associated with

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

The value of the plank's constant 'h' is given by

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

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

When a position comes close to an electron they annihilate into

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

Davision and Germer performed experiment to verify

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

The inside cavity of the black body is

de-Broglies hypthesis was experimentally verified by

Electromagnetic -radiation means:

The special theory of relativity is based on the

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

At the temperature, a body emits radiation which is principally

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

If a material object moves with the speed of light 'C' its mass becomes

Which of the following is not an example of intertial frame

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

The unit of work function is:

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

Electromagnetic radiation or photons interact with matter in

According to the special theory of relativity, a moving clock

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

According to the special theory of relativity, time is

The general theory of relativity treats problems involving

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

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

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