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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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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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 mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
2	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
3	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
4	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
5	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
6	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
7	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
8	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
9	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
10	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above

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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

According to the special theory of relativity

Electromagnetic radiation or photons interact with matter in

According to the special theory of relativity, a moving clock

G.P. Thomson observer experimentally that electrons and neutrons possess

In photoelectric effect the energy of ejected electrons depend on

The special theory of relativity is based on the

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

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:

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

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

0.1 kg mass will be equivalent to the energy

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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

A black body is

Photoelectric effect takes place with a photon of:

The length contraction happens only

The unit of work function is:

Davision and Germer performed experiment to verify

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

A particle having mass and charge equal to that of an electron is called:

The inside cavity of the black body is

Photoelectrons are emitted when ultraviolet light falls on:

Photocell is a device which converts

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

Pair production is the phenomenon in which

Which one of the following physical quantities changes with relativistic speed

When a platinum wire is heated, it appears yellow at

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

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

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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