ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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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 location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
2	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
3	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	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
5	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
6	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
7	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
8	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
9	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
10	When a platinum wire is heated, it appears dull red at about	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

The energy of a photon is represented by

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

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

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

The existence of position was predicted by Dirace in

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 special theory of relativity is based on the

The energy of photon 'E' is proported to

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

The concept of direction is purely:

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

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

Which of the following phenomenon proves the particle nature of light

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

Pair production is the phenomenon in which

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

The special theory of relativity is based on:

An inertial frame is that frame in which

The photon of radio-waves has energy of about

Wave nature of particle was proposed by

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

Davision and Germer performed experiment to verify

The inside cavity of the black body is

The year when A.H. compton was awarded Nobel Prize is:

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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

According to the special theory of relativity

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:

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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