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

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
2	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
3	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
4	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
5	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
6	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
7	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
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	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
10	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

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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 no way to detect:

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Victor de-Brogile received the Nobel prize in physics in

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

Intensity of light determines the:

Wave nature of particle was proposed by

The idea of quantization of energy was proposed by:

When a platinum wire is heated, it appears orange red at

The mass of an object will be doubled at speed

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

According to the special theory of relativity, a moving clock

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

Converse of pair production is known as

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

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

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

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

The unit of work function is:

Pair production is the phenomenon in which

The value of the Stephen's constant for black body radiations is given by

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

S.I. unit of planks constant is

A black body is

Which one of the following physical quantities changes with relativistic speed

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

According to the special theory of relativity, time is

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 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

0.1 kg mass will be equivalent to the energy

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

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ECAT Physics Chapter 19 Important MCQ's

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