Question 1

Calculate the mass defect (amu/atom) for a $Cl^{37}$atom for which the actual mass is 36.966 amu.

Accepted Answer

0.341 amu

Answer

0.264 amu

Answer

0.623 amu

Answer

0.388 amu

Question 2

Which of the following is true about gamma rays?

Accepted Answer

Gamma rays are high energy rays emitted by radioactive elements

Answer

Gamma rays are charged high energy rays coming from the outer space

Answer

Gamma rays are charged particles emitted by radioactive elements

Answer

Gamma rays are uncharged high energy rays coming from the outer space

Question 3

Which of the following has/have zero average value in a plane electromagnetic wave?

Accepted Answer

Both magnetic and electric fields

Answer

Magnetic field only

Answer

Electric field only

Answer

None of these

Question 4

What is the reciprocal of impedance?

Accepted Answer

Admittance

Answer

Conductance

Answer

Inductance

Answer

Reactance

Question 5

Why can’t the DC ammeter measure an alternating current?

Accepted Answer

The average value of a complete cycle is zero

Answer

AC is virtual

Answer

AC changes its direction

Answer

AC cannot pass through a DC ammeter

Question 6

The phase difference between alternating current and emf is  $\frac{\prod}{2}$	
 . Which one of the following cannot be the constituent of the circuit?

Accepted Answer

L and C

Answer

C alone

Answer

R and L

Answer

L alone

Question 7

The core of any transformer is laminated so as to

Accepted Answer

reduce the energy loss due to eddy currents.

Answer

make it robust and strong.

Answer

increase the secondary voltage.

Answer

make it light weight.

Question 8

Which of the following has a minimum wavelength?

Accepted Answer

Gamma rays

Answer

microwave

Answer

Infrared rays

Answer

Blue light

Question 9

Which among the following has the maximum penetrating power?
(a) 
(d)

Accepted Answer

Gamma rays

Answer

Radio waves

Answer

Ultraviolet radiation

Answer

Microwaves

Question 10

Which of the following are not electromagnetic waves?

Accepted Answer

β rays

Answer

X rays

Answer

Cosmic rays

Answer

Gamma rays

Question 11

The structure of solids is investigated by using

Accepted Answer

X-rays

Answer

Microwaves

Answer

Infrared rays

Answer

Gamma rays

Question 12

The ultra-high frequency band of radio waves in the electromagnetic wave is used as in

Accepted Answer

Cellular phone communication

Answer

Both a and b

Answer

Commercial FM radio

Answer

Television

Question 13

Name the moderator used in the nuclear reactor?

Accepted Answer

Graphite

Answer

Thorium

Answer

Berilium

Answer

Plutonium

Question 14

Which isotope of Uranium has the capacity to sustain the chain reaction?

Accepted Answer

U-235

Answer

U-230

Answer

U-225

Answer

U-245

Question 15

During an atomic explosion, the energy released is due to

Accepted Answer

Conversion of mass into energy

Answer

Conversion of mechanical energy into nuclear energy

Answer

Conversion of protons to neutrons

Answer

Conversion of chemical energy into heat energy

Question 16

The envisaged result of a nuclear war or nuclear accident, especially one involving widespread destruction of life and the environment is called

Accepted Answer

all the three

Answer

nuclear apocalypse

Answer

atomic holocaust

Answer

nuclear holocaust

Question 17

For Pair Production phenomenon to occur the photon must have energy, greater than or equal to

Accepted Answer

1.02 MeV

Answer

0.85 MeV

Answer

0.32 MeV

Answer

0.51 MeV

Question 18

What kind of photon is required for the pair production phenomenon to occur?

Accepted Answer

γ-ray Photon

Answer

X-ray Photon

Answer

UV Photon

Answer

Visible Light Photon

Question 19

Charge and momentum are conserved in Pair Production.

Accepted Answer

True

Answer

False

Question 20

Which phenomenon is shown in the figure?

Accepted Answer

Pair annihilation

Answer

Pair Production

Answer

Photoelectric Effect

Answer

Compton effect

Question 21

The dimensional formula of L/R is similar to that of:

Accepted Answer

time

Answer

length

Answer

none of these

Answer

frequency

Question 22

Energy dissipates in LCR circuit in :

Accepted Answer

R only

Answer

C only

Answer

All of the above

Answer

L only

Question 23

What is the ratio of inductive and capacitance reactance's in an ac circuit?

Accepted Answer

ω²LC

Answer

ω²L

Answer

l

Answer

1

Question 24

In series resonant circuit:

Accepted Answer

None of these

Answer

current is zero

Answer

voltage is zero

Answer

reactance is zero

Question 25

The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

Accepted Answer

12 V

Answer

48 V

Answer

6 V

Answer

24 V

Question 26

Transformer works on the principle of:

Accepted Answer

mutual induction

Answer

invertor

Answer

self-induction

Answer

convertor

Question 27

In the series L-C-R circuit, the voltmeter and ammeter readings are:

Accepted Answer

V = 100 Volts, I = 2A

Answer

V = 1000 Volts, I = 2A

Answer

V = 300 Volts, I = 1A

Answer

V = 100 Volts, I = 5A

Question 28

The natural frequency of an L -C-Circuit is equal to :

Accepted Answer

https://uploads.quizalize.com/47a9bf23-cf06-4f7b-bbb5-e6743b8f33c0/question/56e1f885fd63ab31c9084b3ae435c1ee3a735b56.png

Answer

https://uploads.quizalize.com/47a9bf23-cf06-4f7b-bbb5-e6743b8f33c0/question/9d4c4f3ff66a0d35da072c418043d9c5e154b5e2.png

Answer

https://uploads.quizalize.com/47a9bf23-cf06-4f7b-bbb5-e6743b8f33c0/question/71f77cb1addea6f9cf5bd1daf0cacb898a2af34e.png

Answer

https://uploads.quizalize.com/47a9bf23-cf06-4f7b-bbb5-e6743b8f33c0/question/f9b9312de5b375a839cc1a39fb82a9cb6d73ff0c.png

Question 29

In pure inductive circuit current

Accepted Answer

lags behind emf by π/2

Answer

leads the emf by π

Answer

lags behind emf by π

Answer

leads the emf by π/2

Question 30

1 henry is equal to :

Accepted Answer

weber/ampere

Answer

none of these

Answer

weber/volt

Answer

weber ampere

Question 31

The magnetic field is parallel to a surface, then the magnetic flux through the surface is

Accepted Answer

zero

Answer

small but not zero

Answer

infinite

Answer

large but not infinite

Question 32

In the expression e = –d∅/dt, the -ve sign signifies:

Accepted Answer

The induced emf opposes the change in the magnetic flux

Answer

The induced emf is opposite to the direction of the flux

Answer

None of these

Answer

The induced emf is produced only when magnetic flux decreases

Question 33

The magnetic flux (∅) linked with a coil is related to the number of turns (N) of the coil as:

Accepted Answer

∅ ∝ N

Answer

$∅ ∝ N^{-1}$

Answer

$∅ ∝ N^{-2}$

Answer

$∅ ∝ N^2$

Question 34

The magnetic flux (∅) lined with a coil is related to its area (s) as:

Accepted Answer

∅ ∝ s

Answer

∅ ∝ s²

Answer

$∅ ∝ s^{-1/2}$

Answer

$∅ ∝ s^{1/2}$

Question 35

The role of inductance is equivalent to:

Accepted Answer

inertia

Answer

momentum

Answer

energy

Answer

force

Question 36

X-ray was discovered by :

Accepted Answer

Roentgen

Answer

Becquerel

Answer

Marie curie

Answer

Vanload

Question 37

Fusion takes place at high temperature because:

Accepted Answer

Kinetic energy is high enough to overcome repulsion between nuclei

Answer

Atom are ionised at high temperature

Answer

Molecules break up at high temperature

Answer

Nuclei break up at high temp.

Question 38

The mass no. of a nucleus is M and its atomic no. is Z. The number of neutrons in the nucleus is :

Accepted Answer

M – Z

Answer

M

Answer

Z

Answer

M + Z

Question 39

The more readily fissionable isotope of uranium has an atomic mass of:

Accepted Answer

235

Answer

236

Answer

238

Answer

234

Question 40

Maxwell’s equation involving $\frac{dB}{dt}$ is obtained-from:

Accepted Answer

Faraday’s law

Answer

Biot-Savart’s law

Answer

Ampere’s law

Answer

Gauss’s law

Related quizzes

Related quizzes