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 energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
2	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
3	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
4	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
5	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
6	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
7	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
8	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
9	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
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

Photoelectric effect takes place with a photon of:

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

The energy of a photon is represented by

0.1 kg mass will be equivalent to the energy

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

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:

The length contraction happens only

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

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

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

Newton's law of motion do not hold in

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

Which of the following is not an example of intertial frame

The inside cavity of the black body is

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

At the temperature, a body emits radiation which is principally

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

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

Absolute motion cannot be detected

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

Electromagnetic radiation or photons interact with matter in

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

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

The positron was discovered by:

Compton was awarded Nobel prize in physics in

Momentum is a parameter associated with

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 photon of radio-waves has energy of about

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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: