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 year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
3	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
4	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
5	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
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	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
8	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
9	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
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these

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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 photoelectric effect, the maximum energy of photoelectrons depends on the

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

Davision and Germer performed experiment to verify

Intensity of light determines the:

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

The concept of direction is purely:

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

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

An intertial frame of reference is a frame of reference which is

When a platinum wire is heated, it appears white at

Practically the quantity v/c is always:

Photocell is a device which converts

Position was discovered by Carl Anderson in

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

From the theory of relativity, momentum p of the photon is related to energy as

The length contraction happens only

According to the special theory of relativity, time is

The energy of photon 'E' is proported to

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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

There is no way to detect:

In photoelectric effect the energy of ejected electrons depend on

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

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

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:

Compton studied the scattering of x-rays by loosely bound electrons from:

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

A black body is

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

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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