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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
3	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
4	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
5	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
6	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
7	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
8	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
10	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

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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

Photoelectrons are emitted when ultraviolet light falls on:

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

As the light shines on the metal surface, the electrons are ejected

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

Electromagnetic radiation or photons interact with matter in

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

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

Electromagnetic -radiation means:

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

S.I. unit of planks constant 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

Newton's law of motion do not hold in

Photoelectric effect takes place with a photon of:

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

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

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

The photon of radio-waves has energy of about

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

An inertial frame is that frame in which

Intensity of light determines the:

The value of threshold frequency for different metals is

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

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

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

The special theory of relativity is based on the

Converse of pair production is known as

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

the dilation of time applies to the timing processes which are:

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

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ECAT Physics Chapter 19 Important MCQ's

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