Question # 1

If we use two diodes and a centre tapped transformer we eill get

Choose an answer

Transistor

Amplifier

Half wave rectifier

Full wave rectifier

Why transistor is preferred to triode valve for use as an amplifier.

Choose an answer

Because it can handle large power

Because it has higher input impedance

Because it has higher voltage gain

Because it has lower voltage gain

The value of principal quantum number for an ionized atom is.

Choose an answer

13.6 eV

27.2 eV

54.4 eV

100 eV

One gray is equal to.

Choose an answer

1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

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

Choose an answer

Alpha particles

Beta particles

Gama particles

Neutrons

There are how many modes of operations of a BJT.

Choose an answer

2

3

4

5

The neutral atoms of all isotopes of the same element contain the same numbers of.

Choose an answer

Electrons and protons

Electrons and neutrons

Neutrons

Neutrons and protons

The continuous x rays spectrum is obtained due to

Choose an answer

Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

A CE amplifier with by passed emitter resistor is an example of.

Choose an answer

Current series feedback

Voltage sires feed back

Current shunt feedback

Voltage shunt feed back

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

Choose an answer

Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

The critical mass of a fissionable material is.

Choose an answer

1 kg

10 kg

100 kg

1.,000 kg

A unijunction transistor

Choose an answer

Has only one junction

Is a two terminal device

Is fabricated from germanium

Is fabricated fromuranium

The 'x' in X-rays means

Choose an answer

Xenon

Explosion

x for unknown

X makes the spot

Which of the following is invariant under Galilean transformation.

Choose an answer

Velocity

Impulse

Momentum

Distance

The loss of mass in a.m.u in a nuclear change can be calculated from energy involved in MeV by

Choose an answer

Dividing by 931

Multiplying by 931

Diving by 391

Multiplying by 391

The chemical behavior of an atom is determined by

Choose an answer

Mass number

Number of Isotopes

Atomic number

Binding energy

The unit of Rydberg constant R is

Choose an answer

m

m3

m^-1

m-2

When transistor works as an amplifier, its output is.

Choose an answer

More

Less

Zero

Directly proportional to the input

In scattering experiment which force scatters alpha particle.

Choose an answer

Nuclear force

Coulomb's force

Gravitational force

Centripetal force

In de Brogile model electron orbit must form

Choose an answer

Spectrum

Wave packets

Franhoffer lines

Clouds

The most familiar example of radioactive dating is.

Choose an answer

Nitrogen dating

Carbon dating

Hydrogen dating

Helium dating

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