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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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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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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Waleed Ahmed 26 - Feb - 2023 10 Min 00 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	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
2	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
3	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
4	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
5	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
6	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
7	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
8	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
9	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
10	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

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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

In photoelectric effect the energy of ejected electrons depend on

Compton was awarded Nobel prize in physics in

The concept of direction is purely:

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

The value of threshold frequency for different metals is

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

Strictly speaking, the earth is:

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

The inside cavity of the black body is

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

Wien's constant is measured in:

Photocell is a device which converts

Victor de-Brogile received the Nobel prize in physics 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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The mass of an object will be doubled at speed

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) 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

According to the special theory of relativity

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

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

Compton shift refers to:

The energy of a photon is represented by

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:

S.I. unit of planks constant is

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

When platinum wire is heated, it appears cherry red at

The energy of the 4th orbit in hydrogen atom is

Photoelectrons are emitted when ultraviolet light falls on:

The special theory of relatively treats the problems involving:

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ECAT Physics Chapter 19 Important MCQ's

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