Question # 1

If an object moves with speed of light, its mass will be.

Choose an answer

Zero

Maximum

Minimum

infinity

Potassium Cathodes in photocell emit electrons for a light.

Choose an answer

Visible

Infra red

Ultra violet

X rays

unit of Plank's constant is same as that of.

Choose an answer

Acceleration

Angular momentum

Linear momentum

Entropy

Compton's effect is associated with

Choose an answer

gamma rays

Beta rays

X rays

Positive rays

The uncertainty principle was given by

Choose an answer

De-Broglie

Heisenberg

Einstein

Max Planck

Platinum wire becomes yellow at a temperature of.

Choose an answer

900^oC

1300^oC

1600^oC

500^oC

The mass of an object will be doubled at speed.

Choose an answer

2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

The position has charge which is in magnitude equal to the charge on

Choose an answer

Electron

Proton

β particle

All

The maximum kinetic energy of emitted photo electrons depends upon.

Choose an answer

The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

The emission of electrons from metal surface when exposed to light is called:

Choose an answer

Compton effect

Pair production

Photoelectric effect

None of above

The energy of photon is givne by

Choose an answer

mv2/2

hf

Va e

mac¹

Using relativistic effects the location of an air craft after an hour fight can be predicated about

Choose an answer

20 m

50 m

760 m

780 m

The quantity/factor h/m_oc has the dimensions of.

Choose an answer

Length

Time

Mass

Energy

A perfect absorber must also be perfect

Choose an answer

Cavity

Sources of radiation

Radiator

None of these

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

Choose an answer

50 V

2 V

5 V

15 V

When platinum is it becomes orange at.

Choose an answer

500^oC

900^oC

1100^oC

1300^oC

A positron is an anti particle of.

Choose an answer

Proton

Electron

Neutron

Photon

Wave nature of light appears in

Choose an answer

Pair production

Compton effect

Photo electric

Interference

More Classes

Other Links

Physics ICS Part 2 Chapter 19 Online MCQ's Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer