Question # 1

Which of the following configuration of BJTs gives both voltage gain and current gain.

Choose an answer

common Base

Common Emtter

Common collector

All of the above

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

Choose an answer

Transistor

Amplifier

Half wave rectifier

Full wave rectifier

Which of the following circuits is used as local oscillator in radio receivers.

Choose an answer

AF oscillator

Phase Local Loop

RF oscillator

All of the above

The mass defect of Bohr's atomic model is

Choose an answer

Exclusion of nuclear motion

missing of classical and quantum theories

Failed to explain the fine structure of spectral line

All of the above

White light a tungsten filament lamp is passed through sodium vapor and viewed through a diffraction gritting Which of the following best describes the spectrum which would be seen.

Choose an answer

Coloured lines on a black background

Coloured lines on a white background

Dark lines on a coloured background

Dark lines on a white background

Magnetic field does not cause deflection in

Choose an answer

Alpha particle

Beta minus particles

Beta plus particles

Gama rays

Sub atomic particles which experience strong nuclear force are.

Choose an answer

Leptons

Hadrons

Mesons

Quarks

The most convenient unit for energy at the atomic level is.

Choose an answer

Joule

Watt second

Newton metre

Electron volt

The critical mass of a fission reaction is.

Choose an answer

The mass to start a nuclear fission reaction

The minimum mass for chain reaction

The size of the reactor core

The size of fuel plus the size of moderator

the wavelength of continuous X-rays is inversely proportional to.

Choose an answer

Intensity of incident electron beam

Temperature of the target

Intensity of X-rays

The energy of electrons striking the target

The molecular weight of D2O is

Choose an answer

16

18

20

24

One rem is equal to.

Choose an answer

0.1 Sv

0.01 Sv

0.001 Sv

0.0001 SV

A newly prepared radioactive nuclide has a decay constant Lamda of 10-6 s-1 What is the approximate half life of the nuclide.

Choose an answer

1 hour

1 day

1 week

1 month

The advantage of electron tube over a transistor is.

Choose an answer

Low consumption of power

Low input impedance

Its high efficiency

Its high gain

The emission of electrons from a metal surface when exposed to light of suitable frequency is called.

Choose an answer

Pair production

Compton effect

Photo electric effect

Zeeman effect

What is the basic advantage of class A operation of an amplifier.

Choose an answer

It has high efficiency

It has high gain

It has low distortion

It has high distortion

The half life of a radioactive substance depend on.

Choose an answer

Pressure

Temperature

Amount of substance

No external influences

The decay process in which an unstable nucleus splits into two fragments of comparable mass is known as.

Choose an answer

Nuclear fission

nuclear fusion

Radioactivity

Carbon dating

The continuous x rays spectrum is obtained due to

Choose an answer

Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

A logic circuit with one input and one output that inverts the input signal at the output is.

Choose an answer

AND gate

NOT gate

OR gate

NOR gate

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