Question # 1

The electrons behave as wave because.

Choose an answer

They can be diffracted by a crystal

They can be defecting by magnetic field

They can be deflecting by electric field

they can produce ions in gases

The SI unit of radioactivity is.

Choose an answer

Becquerl

Curie

Joule

rutherford

the gain of an amplifier is independent of

Choose an answer

The two externally connected resistances

What is happening inside the amplifier

Internal structure of the amplifier

All of the above

The total number nucleons in a nucleus are called.

Choose an answer

Mass number

Atomic number

Neutron number

Isotopes

The half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely.

Choose an answer

12 years

24 years

48 years

infinity

The half life of a given radioactive isotope is 10 years The original mass of the isotope is 12 g What mass of this isotope remains un decayed after 20 years.

Choose an answer

0.5 g

1.2 g

3.0 g

6.0 g

X-rays are

Choose an answer

Longitudinal wave

Transvers waves

Secondary waves

Fast sound waves

The unit generally used for measuring astronomical distances is.

Choose an answer

Parsecs

Light year

Metre

Kilometer

The number of electrons in U nucleus are.

Choose an answer

92

235

zero

143

Which of the following radiations can penetrate 20 cm thick steel.

Choose an answer

Alpha particles

Beta particles

Gama particles

Neutrons

A solid state detector is basically

Choose an answer

A reverse biased p-n junction

A forward biased p-n junction

A p-n -p transistor

A n-p-n transistor

Sub atomic paticles whihc does not experience strong nuclear force are.

Choose an answer

hadrons

Photons

Leptons

Nucleons

The back ground radiation in the atmosphere on the average is

Choose an answer

0.5 Sv per year

1.0 Sv per year

1.5 Sv per year

2.0 Sv per year

The maximum K.E. with which photoelectrons are emitted depends very strongly on the.

Choose an answer

Intensity of incident light

Electric field near the photocathode

Frequency of incident light

Polarization of incident light

Lines of Balmer series are emitted by hydrogen atom when the electron jumps from

Choose an answer

The first orbit to any other orbit

Higher orbits to second orbit

Higher orbits to first orbit

The third orbit to higher orbit

Which particle is removed by a photon.

Choose an answer

Quark

Electron

Proton

Neutron

The energy that must be added to separate the nucleus is called.

Choose an answer

Critical energy

Binding energy

Gravitational energy

Electrostatic energy

The electron behave an waves because

Choose an answer

They can be diffracted by a crystal

They can produce ions in gases

They can be deflected by magnetic field

They can be deflected by electric field

Isotopes are the atoms of the same elements which contain equal number of.

Choose an answer

Nucleus

Neutrons

Protons

Electrons

Which of the following is its own anti particle.

Choose an answer

Photon

Electron

Proton

positron

Tracer techniques make use of.

Choose an answer

Neutron scattering

Electron beams

LASER

Radioactive isotopes

More Classes

Other Links

PPSC Physics Chapter 7 Modern Physics 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

Choose an answer

Choose an answer

Choose an answer