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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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
2	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
3	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
4	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
5	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
6	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
7	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
8	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
9	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
10	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one 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 special theory of relatively treats the problems involving:

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

Which of the following phenomenon proves the particle nature of light

The year when A.H. compton was awarded Nobel Prize is:

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

The concept of direction and position are purely

The positron was discovered by:

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

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

According to the special theory of relativity, a moving clock

A black body is

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

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

There is no way to detect:

Intensity of light determines the:

According to the special theory of relativity

Photocell is a device which converts

Newton's law of motion do not hold in

In order to produce pair production, a photon must have a energy

The special theory of relativity is based on the

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

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

When a platinum wire is heated, it appears yellow at

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

An inertial frame is that frame in which

Absolute motion cannot be detected

The special theory of relativity treats problems invoving

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

When a platinum wire is heated, it appears white at

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

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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: