ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
2	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
3	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
4	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
5	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
6	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
7	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
8	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
9	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
10	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

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

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

When a platinum wire is heated, it appears yellow at

The concept of direction is purely:

According to the special theory of relativity, a moving clock

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

Pair production is the phenomenon in which

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

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 photoelectric effect, the maximum energy of photoelectrons depends on the

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

An inertial frame is that frame in which

Electromagnetic -radiation means:

Compton was awarded Nobel prize in physics in

S.I. unit of planks constant is

The energy of a photon is represented by

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

Photocell is a device which converts

According to the special theory of relativity, time is

Converse of pair production is known as

The existence of position was predicted by Dirace in

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

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

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

G.P. Thomson observer experimentally that electrons and neutrons possess

The inside cavity of the black body is

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

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

the symbol to be used in relativity problems denotes:

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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: