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	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
3	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
4	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
5	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
6	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
7	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
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	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
10	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite

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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

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

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

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

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

A particle having mass and charge equal to that of an electron is called:

If a body reaches a speed equal to the speed of light, then its mass will became

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

de-Broglies hypthesis was experimentally verified by

The concept of direction and position are purely

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

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

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 idea of quantization of energy was proposed by:

When platinum wire is heated, it appears cherry red at

The special theory of relativity treats problems invoving

0.1 kg mass will be equivalent to the energy

When a platinum wire is heated, it appears yellow at

The value of threshold frequency for different metals is

When a position comes close to an electron they annihilate into photons such that

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

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

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

Converse of pair production is known as

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

The energy of a photon is represented by

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

The positron was discovered by:

Due to relative motion of observer and the frame of reference of events, time always:

Victor de-Brogile received the Nobel prize in physics in

Photocell is a device which converts

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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