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 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
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	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
4	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
5	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
6	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
7	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
8	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
9	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
10	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature

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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

The special theory of relatively treats the problems involving:

A non-inertial frame of reference is one, in which

Compton shift refers to:

S.I. unit of planks constant is

Electromagnetic radiation or photons interact with matter in

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

The concept of direction and position are purely

The energy of a photon is represented by

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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

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

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

In order to produce pair production, a photon must have a energy

The energy of photon 'E' is proported to

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Davision and Germer performed experiment to verify

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

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

Which of the following phenomenon proves the particle nature of light

The year when A.H. compton was awarded Nobel Prize is:

The special theory of relativity is based on the

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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

Absolute motion cannot be detected

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Photocell is a device which converts

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: