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

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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	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
2	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
3	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
4	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
5	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
6	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
7	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
8	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
9	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
10	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules

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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

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

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:

Victor de-Brogile received the Nobel prize in physics in

Which of the following phenomenon proves the particle nature of light

The Stephen-Boltzmann law for the black body radiation is given by

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

The idea of quantization of energy was proposed by:

In photoelectric effect the energy of ejected electrons depend on

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

Photocell is a device which converts

The inside cavity of the black body is

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

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

Davision and Germer performed experiment to verify

Wave nature of particle was proposed by

The existence of position was predicted by Dirace in

An inertial frame is that frame in which

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

The energy of photon 'E' is proported to

The concept of direction is purely:

Practically the quantity v/c is always:

When a position comes close to an electron they annihilate into photons such that

According to the special theory of relativity, time is

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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

The special theory of relatively treats the problems involving:

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be