Question # 1

Tracer techniques make use of.

Choose an answer

Neutron scattering

Electron beams

LASER

Radioactive isotopes

Which term given below refers to the concept moving clocks run slower than clocks at rest w.r.t an observer.

Choose an answer

Simultaneously

Mass variation

time dilation

Length contraction

The SI unit of current gain is.

Choose an answer

Ampere

Ampere metre

Ampere volt

It has no unit

When a helium atom loses an electron it becomes.

Choose an answer

An a particle

A proton

A positive helium ion

A negative helium ion

The critical mass of fissionable uranium -235 can be reduced by

Choose an answer

Adding impurities to it

Heating the material

surrounding it by neutron reflecting material

Surrounding it by neutron absorbing material

Which of the following is invariant under Galilean transformation.

Choose an answer

Velocity

Impulse

Momentum

Distance

Push pull amplifiers employ

Choose an answer

One transistor

Two transistors

Three transistors

Four transistors

According to Max. Planck, energy is released or absorbed in discrete packets called.

Choose an answer

quanta

Meson

Energy shells

Position

What is the energy equivalent to amu in Me V

Choose an answer

0.931 MeV

9.31 MeV

93.1 MeV

931 MeV

Besides U ²³⁵ what else is needed for making as atomic bomb.

Choose an answer

Electons

Protons

Neutrons

Photons

A transistor can be used as

Choose an answer

Oscillator

Amplifier

Switch

Both a and c

How positives feedback will effect an amplifier.

Choose an answer

Increases the voltage gain

Decreases the voltage gain

Imitates oscillation to occur

Damaged it

The charge on a helium nucleus is equal to the charge of.

Choose an answer

Two electrons

Two protons

Two neutrons

One proton

The total energy of an electron in an orbit around the nucleus is.

Choose an answer

Zero

Unity

Infinity

Negative

Atomic reactor is based on

Choose an answer

Controlled chain reaction

Uncontrolledly chain reaction

Nuclear fission

Nuclear fusion

Why is a capacitor resistor combination used in oscillators in grid circuit.

Choose an answer

To generate oscillation

To bias the grid automatically

To amplify oscillations

To sustain the oscillations.

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

Choose an answer

Radiowaves

Alpha particles

Beta particles

gama particles

The hyperfine lines in the spectrum relates to

Choose an answer

Stark effect

Zeeman effect

Lande's spliting

Nuclear magnetic spin

Which of the following quantities is discrete according to Bohr's hypothesis.

Choose an answer

Momentum

Potential energy

Angular velocity

Angular momentum

When transistor works as an amplifier, its output is.

Choose an answer

More

Less

Zero

Directly proportional to the input

In potential for the material of cathode pure metals are rarely used because of their

Choose an answer

Low reflecting power

High reflecting power

Low resolving power

High resolving power

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