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 dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
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	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
4	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
5	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
6	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
7	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
8	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
9	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
10	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics

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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

There is no way to detect:

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

When a platinum wire is heated, it appears white at

Which one of the following physical quantities changes with relativistic speed

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

When platinum wire is heated, it appears cherry red at

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

Practically the quantity v/c is always:

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

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

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

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

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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

The existence of position was predicted by Dirace in

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

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

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 special theory of relatively treats the problems involving:

Absolute motion cannot be detected

Which of the following is not an example of intertial frame

The Einstein's changes in length, mass and time are not observed in common life because

The photon of radio-waves has energy of about

Electromagnetic -radiation means:

A photon is considered to have

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

The unit of work function is:

According to the special theory of relativity, time is

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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