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	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
2	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
3	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
4	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
5	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
6	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
7	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
8	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
9	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
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 positron was discovered by:

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

A black body is

Victor de-Brogile received the Nobel prize in physics in

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

According to the special theory of relativity, a moving clock

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

The unit of work function 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

The Einstein's changes in length, mass and time are not observed in common life because

The length contraction happens only

At the temperature, a body emits radiation which is principally

Electromagnetic radiation or photons interact with matter in

The existence of position was predicted by Dirace in

In photoelectric effect the energy of ejected electrons depend on

The general theory of relativity treats problems involving

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

The special theory of relativity treats problems invoving

The nature of radiations emitted by a hot body depends upon its:

The concept of direction is purely:

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

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

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

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

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

Which of the following is not an example of intertial frame

Photocell is a device which converts

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

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

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ECAT Physics Chapter 19 Important MCQ's

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