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 unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
2	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. larger B. shorter C. equal D. none of these
3	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
4	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
5	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
6	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
7	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
8	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
9	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
10	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV

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

The length contraction happens only

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

The special theory of relativity treats problems invoving

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

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

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

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

The positron was discovered by:

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

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

Compton shift refers to:

Which of the following is not an example of intertial frame

When a platinum wire is heated, it appears yellow at

Practically the quantity v/c is always:

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

The photon of radio-waves has energy of about

A particle having mass and charge equal to that of an electron is called:

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

de-Broglies hypthesis was experimentally verified by

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

Photoelectric effect takes place with a photon of:

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units 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

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

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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