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

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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

Sr.#	Question	Answer
1	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	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
3	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
4	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
5	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
6	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
7	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
8	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
9	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
10	When a platinum wire is heated, it appears orange red at	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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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

S.I. unit of planks constant is

An intertial frame of reference is a frame of reference which is

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

According to the special theory of relativity

The special theory of relativity is based on the

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

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

Practically the quantity v/c is always:

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

When a platinum wire is heated, it appears white at

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

According to the special theory of relativity, time is

Wien's constant is measured in:

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

An inertial frame is that frame in which

Pair production is the phenomenon in which

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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

Absolute motion cannot be detected

Which of the following is not an example of intertial frame

The mass of an object will be doubled at speed

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

The special theory of relativity treats problems invoving

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

Momentum is a parameter associated with

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

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

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