Question for ISRO Scientist EE (Electrical Engineering) 2026 - Quiz / Questions / MCQ

Objective Questions

Latest ISRO Scientist EE Exam Question (Objective Questions), MCQ in English

Subjects : Electrical

Question Bank ISRO Scientist EE (Electrical Engineering) Exam - English

Electrical

Question 1Single Answer

Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is

A
0.8 Ω
B
1.4 Ω
C
2 Ω
D
2.8 Ω

Question 2Single Answer

For the intrinsic gallium-arsenide, the conductivity at room temperature 25°C is 10^-6 (ohm-m)^-1, the electron and hole nobilities are 0.85 m²/V-s and 0.04 m²/V-s respectively. What is the intrinsic carrier concentration at the room temperature?

A
7.0 × 10¹² m^-3
B
7.0 × 10^-12 m^-3
C
7.0 × 10^-12 m³
D
7.0 × 10¹² m³

Question 3Single Answer

The resistivity of intrinsic germanium at 30°C is 0.46 –m. What is the intrinsic carrier density at 30°C if the electron mobility is 0.38 m²/V-s and the hole mobility is 0.18 m²/V-s?

A
9.2 × 10⁵/m³
B
2.77 × 10³/m³
C
2.43 × 10¹⁹/m³
D
8.9 × 10¹²/m³

Question 4Single Answer

Heat conduction in a semiconductor takes place

A
By the mobility of the carriers
B
Due to energy gap between conduction band and valency band
C
By the holes and thermal vibrations of atoms
D
By the electrons and thermal vibrations of atoms

Question 5Single Answer

Brewster angle is the angle when a wave is incident on the surface of a perfect dielectric at which there is no reflected wave and the incident wave is

A
Parallel polarized
B
Perpendicularly polarized
C
Normally polarized
D
None of the above

Question 6Single Answer

An electrical breakdown of a p-n junction occurs if

A
Forward voltage increases up to the rating
B
Reverse voltage increases beyond the rating
C
Forward voltage decreases below the rating
D
Reverse voltage decreases below the rating

Question 7Single Answer

The chief deterrent to the widespread application of superconducting materials is

A
Very difficult to form, machine or case
B
The difficult in attaining and maintaining extremely low temperature
C
The poor strength-to-weight ratio
D
The lower oxidation rate at elevated temperatures

Question 8Single Answer

Which one of the following properties is not observed in the carbon nanotubes ?

A
High stiffness and strengths
B
Low densities
C
Unusual electrical property
D
Non-ductile

Question 9Single Answer

The evidence for the importance of electron-phonon interaction in super-conductors comes from

A
Meissner effect
B
Josephson effect
C
Isotope effect
D
x quantization experiments

Question 10Single Answer

Which one of the following materials is used for cable insulation ?

A
Phenol formaldehyde
B
Polytetrafluoroethylene
C
Polyvinyl chloride
D
Acrylonitrile butadiene styrene

Question 11Single Answer

For high speed reading and storing of information in a computer, the material used is

A
Ferrite
B
Piezoelectric
C
Pyroelectric
D
Ferromagnetic above 768°C

Question 12Single Answer

The temperature above which an anti-ferromagnetic material becomes paramagnetic is called

A
Peak temperature
B
Neel temperatur
C
Critical temperature
D
Weiss temperature

Question 13Single Answer

Which effect is the converse of Peltier effect ?

A
Seeback effect
B
Thomson effect
C
Hall effect
D
Joule effect

Question 14Single Answer

Magnetic materials which may be readily magnetized in either direction are

A
Soft magnetic materials
B
Hard magnetic materials
C
High eddy current loss materials
D
High hysteresis loss materials

Question 15Single Answer

Consider the following statements regarding a ferromagnetic material:
1.Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit hysteresis effect.
2.The coercive force is the filed required to reduce the flux density to zero.
Which of the above statements is/are correct?

A
Both 1 and 2
B
Neither 1 nor 2
C
1 only
D
2 only

Question 16Single Answer

The impact ionization phenomenon in semiconductor may be viewed as the reverse process of

A
Radiative recombination
B
Auger recombination
C
Surface recombination
D
Shockley-Read-Hall recombination

Question 17Single Answer

Refractive index of a slice glass can be reduced by doping it with tiny amount of

A
GeO₂
B
B₂O₃
C
P₂O_5x
D
Al₂O₃

Question 18Single Answer

If a diameter of a copper wire is increased by two times keeping its terminal voltage same, then the drift velocity will

A
Become twice
B
Become half
C
ecome four times
D
Remain unchanged

Question 19Single Answer

In an induction type energy meter, the steady speed attained by the rotating disc is
1.Proportional to the deflecting torque.
2.Proportional to the resistance of the path of eddy currents.
3.Inversely proportional to the effective readings of disc from its axis.
4.Inversely proportional to the square of brake magnetic flux.
Which of the above are correct?

A
1, 2 and 3 only
B
1, 2 and 4 only
C
2, 3 and 4 only
D
1, 2, 3 and 4

Question 20Single Answer

If ‘KCLFTSB’ stands for ‘best of luck’ and ‘SHSWDG’ stands for ‘good wishes’, which of the following indicates ‘ace the exam’?

A
MCHTX
B
MXHTC
C
XMHCT
D
XMHTC

Question 21Single Answer

Consider the following statements associated with the basic electrostatic properties of ideal conductors:
1.The resultant field inside is zero.
2.The net charge density in the interior is zero.
3.Any net charges reside on the surface.
4.The surface is always equipotential.
5.The field just outside is zero.
Which of the above statements are correct?

A
1, 2, 3 and 4
B
3, 4 and 5 only
C
1, 2 and 3 only
D
2 and 3 only

Question 22Single Answer

A semiconductor device made out of a material having very high temperature coefficient of resistance is

A
Transistor
B
Varistor
C
Thyristor
D
Thermistor

Question 23Single Answer

The electrical conductivity of a semiconductor increases with increase in temperature because

A
The carrier concentration increases
B
The mobility of carrier increases
C
Both carrier concentration and mobility increases
D
The band gap decreases

Question 24Single Answer

Which of the following are associated with soft superconductors?
1.Silsbee’s rule
2.Meissner effect
3.Faraday rotation
4.Curie-Weiss law

A
2, 3 and 4
B
1 and 3 only
C
1 and 2 only
D
2 and 3 only

Question 25Single Answer

In a two-channel oscilloscope operating in x-y mode, two in-phase 50 Hz sinusoidal waveforms of equal amplitude are fed to the two channels. What will be the resultant pattern on the screen?

A
An ellipse
B
A parabola
C
Straight line inclined at 45 with respect to x-axis
D
A circle

Question 26Single Answer

Materials, whose resistivity at very low temperature plunges from a finite value to zero and remains there upon further cooling, are known as

A
Ferromagnetic materials
B
High-energy hard magnetic materials
C
Superconductors
D
Ferromagnetic materials

Question 27Single Answer

In a superconductor, is the temperature is decreased below its critical temperature, the value of critical magnetic field will

A
Increase
B
Decrease
C
Not change
D
Increase or decrease depending on the superconductor material

Question 28Single Answer

The imaginary part of dielectric constant determines

A
Component of current which is in phase with the applied field
B
Component of energy absorbed per m³
C
Amount of applied field
D
Component of voltage which is in phase with the applied field

Question 29Single Answer

Direction: Each of the items consists of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the codes given below

A
Statement (I):Hard magnetic materials are used for making permanent magnets.
Statement (II):
Hard magnetic materials have relatively small and narrow hysteresis loop.
B
Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
C
Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
D
Statement (I) is true but Statement (II) is false
E
Statement (I) is false but Statement (II) is true

Question 30Single Answer

In 8085A microprocessor, the operation performed by the instruction LHLD 2100 H is

A
(H) ← 21 H, (L) ←00
B
(H) ← M (2100 H), (L) ←M(2101H)
C
(H) ← M (2100 H), (L) ←M(2100H)
D
(H) ← 00H, (L) ←21H

Question 31Single Answer

If the magnetic susceptibility of a specimen is small and positive, the specimen is

A
Diamagnetic
B
Paramagnetic
C
Ferromagnetic
D
Non-magnetic

Question 32Single Answer

Manganese ferrite is a 1 : 1 mixture of

A
Manganese nitride and iron oxide
B
Manganese oxide and iron nitride
C
Manganese nitride and iron sulphide
D
Manganese oxide and iron sulphide

Question 33Single Answer

When a ferromagnetic substance is magnetized, small changes in dimensions occur. Such a phenomenon is known as

A
Magnetic hysteresis
B
Magnetic expansion
C
Magnetostriction
D
Magneto-calorisation

Question 34Single Answer

In ferromagnetic , anti-ferromagnetic and ferromagnetic materials, the atomic thermal motions counteract the coupling forces between the adjacent atomic dipole moments, thereby causing

A
Some dipole misalignment regardless of whether an external field is present
B
Increase in dipole alignment regardless of whether an external field is present
C
No effect on dipole alignment
D
Atoms tend to de-randomize the direction of moments

Question 35Single Answer

The Hall effect voltage in intrinsic silicon

A
Is positive
B
Is zero
C
Is negative
D
Changes its sign based on application of magnetic field

Question 36Single Answer

Most outstanding property of indium antimonide is

A
A very wide range gap
B
High resistivity at room temperature
C
High carrier mobility
D
Very low conductivity at room temperature

Question 37Single Answer

Which of the following semiconducting compounds is used in photoconductive devices?

A
Caesium antimonide
B
Barium oxide
C
Lead sulphide
D
Zinc oxide

Question 38Single Answer

Consider the following transducers:
1.LVDT
2.Piezoelectric
3.Thermocouple
4.Photovoltaic cell
Which of the above are active transducers?

A
1, 2 and 3
B
1, 2 and 4
C
2 and 3 only
D
2, 3 and 4

Question 39Single Answer

Consider the following statements regarding magnetic materials:
1.A diamagnetic material has no permanent dipole
2.Paramagnetic material has anti-parallel orientation of equal moments with neighboring dipoles
3.Ferrimagnetic material has anti parallel orientation of unequal moments between neighboring dipoles
4.Anti-ferromagnetic material has negligible interaction between neighboring dipoles
Which of these statements are correct?

A
1 and 2
B
3 and 4
C
2 and 4
D
1 and 3

Question 40Single Answer

Consider the following statements regarding hysteresis loops of hard and soft magnetic materials:
1.Hysteresis loss of hard magnetic material will be less than that of soft material
2.Coercivity of hard materials will be greater than that of soft material
3.Retentivity of the two materials will always be equal
Which of these statements are correct?

A
1, 2 and 3
B
2 only
C
3 only
D
1 and 3 only

Question 41Single Answer

Loss-tangent in plane waves in lossy dielectrics will be

A
Proportional to the Y component of the magnetic field intensity (H_Y)
B
Inversely proportional to the Y component of the magnetic field intensity (H_Y)
C
Inversely proportional to the X component of the magnetic field intensity (H_X)
D
proportional to the X component of the magnetic field intensity (H_X)

Question 42Single Answer

Orientational polarization is

A
Inversely proportional to temperature and proportional to the square of the permanent dipole moment
B
proportional to temperature as well as to the square of the permanent dipole moment
C
proportional to temperature and inversely proportional to the square of the permanent dipole moment
D
Inversely proportional to temperature as well as to the square of the permanent dipole moment

Question 43Single Answer

Behavior of conductors, semiconductors and insulators is explained on the basis of

A
Atomic nature
B
Molecular structure
C
Energy band structure
D
All of the above

Question 44Single Answer

In general, for a superconductor, which of the following statements is true?

A
A superconductor is a perfect paramagnetic material with the magnetic susceptibility equals to positive unity
B
A superconductor is a perfect diamagnetic material with the magnetic susceptibility equals to negative one
C
A superconductor is a perfect ferromagnetic material with the magnetic susceptibility equals to positive one
D
A superconductor is a perfect piezoelectric material with the magnetic susceptibility equals to negative one

Question 45Single Answer

Ferro-electric materials have a

A
High dielectric constant which varies non linearly
B
Low dielectric constant and is non-linear
C
High dielectric constant which varies linearly
D
Low dielectric constant but linear

Question 46Single Answer

In the magnetic core the electromotive forces (emf) induced in accordance with Faraday’s law of electromagnetic induction give rise to

A
Eddy current
B
Excitation current
C
Armature current
D
Field current

Question 47Single Answer

Consider the following characterizing parameters of a material:
1.Magnetic permeability
2.Electron relaxation time
3.Electron effective mass
4.Energy band gap
In case of metals, increase in one of the above parameter decreases its conductivity, while increase in another increases the conductivity. There are respectively

A
1 and 3
B
3 and 2
C
4 and 3
D
1 and 2

Question 48Single Answer

Some magnetic materials may be classified on the basis of
1.Susceptibility
2.Saturation
3.Spin arrangement
4.Nature of hysteresis loop
5.Domain structure
6.Critical temperature above which it behaves as a paramagnetic material
Which of these can be used to distinguish between ferri and ferromagnetic materials?

A
1, 3 and 4 only
B
2, 3 and 6 only
C
3, 4 and 5 only
D
1, 2, 3, 4, 5 and 6

Question 49Single Answer

Magnetism is mainly due to only electron spin around their axis in case of

A
Diamagnetic materials
B
Paramagnetic materials
C
Ferromagnetic materials
D
Paramagnetic and Diamagnetic materials

Question 50Single Answer

For Paramagnetic materials, the relative permeability is

A
Less than unity but magnetic susceptibility is relatively small and positive
B
greater than unity and magnetic susceptibility is relatively small but positive
C
equal to unity and magnetic susceptibility is relatively large but positive
D
Less than unity but magnetic susceptibility is relatively large and positive

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Electrical

Question 51Single Answer

Permalloy and Mumetal are examples of

A
Silicon and iron alloys
B
Nickel and iron alloys
C
Cobalt and iron alloys
D
Permanent magnetic materials

Question 52Single Answer

When a ferromagnetic substance is magnetized, the phenomenon of ‘magnetostriction’ causes

A
Increase in the body temperature
B
Change in the permeability of the substance
C
Small change in its dimensions
D
Decrease in the saturation flux-density

Question 53Single Answer

The resistivity of ‘Ferrites’ is very much higher than that of ferromagnetic metals, because

A
Ferrites are chemical compounds and the electrons in them are subject to restraint of valence forces
B
Ferrites have a low eddy current loss
C
Ferrites have a non-homogeneous molecular structure
D
Ferrites have varying flux-density inside the core

Question 54Single Answer

When the temperature exceeds the transition temperature, a ferromagnetic material becomes similar to

A
Anti- ferromagnetic material
B
Diamagnetic material
C
ferrimagnetic material
D
paramagnetic material

Question 55Single Answer

Einstein relation is referred between

A
The diffusion constant and the mobility
B
The conduction and diffusion currents
C
The conduction and diffusion voltages
D
None of the above

Question 56Single Answer

In a piezoelectric crystal oscillator, the oscillation or tuning frequency is linearly proportional to the

A
Mass of the crystal
B
Square root of the Mass of the crystal
C
Square of the Mass of the crystal
D
Inverse of the Square root of the Mass of the crystal

Question 57Single Answer

Which of the following are piezoelectric substances?
1.Barium Titanate
2.Lead Titanate
3.Lead Zirconate
4.Cadmium Suplhate

A
1, 2 and 4
B
1, 3 and 4
C
1, 2 and 3
D
2, 3 and 4

Question 58Single Answer

Consider the following statements:
1.Fermi level in a p-type semiconductor lies close to the top of the valence bond.
2.The forbidden energy in Germanium at 0°K is exactly 0.75 eV.
3.When a p-n junction is reverse biased, then electrons and holes move away from the junction.
Which of these statements are correct?

A
1, 2 and 3
B
1 and 2 only
C
2 and 3 only
D
1 and 3 only

Question 59Single Answer

For a fully transposed transmission line

A
positive negative and zero sequence impedances are equal
B
positive and negative sequence impedances are equal
C
zero and positive sequence impedances are equal
D
negative and zero sequence impedances are equal

Question 60Single Answer

The unit of magnetic flux density is

A
Gauss
B
Tesla
C
Bohr
D
Wber/sec

Question 61Single Answer

Skin depth is the distance from the conductor surface where the field strength has fallen to

A
of its strength at the surface
B
of its strength at the surface
C
(1/ ) of its strength at the surface
D
(1/ ) of its strength at the surface

Question 62Single Answer

The electric field in the vicinity of two oppositely charged parallel conductors is

A
Radial uniformly
B
In parallel lines between the two imaginary parallel planes passing through the centers of the two conductors
C
Non uniform and its direction changes from point to point
D
In parallel circular paths between the two conductors, with the center of the circles located at the mid-point of a line joining the two centers of the two conductors

Question 63Single Answer

Two charges are placed at a distance apart. Now, if a glass slab is inserted between them, then the force between the charges will

A
Reduce to zero
B
Increase
C
Decrease
D
Not change

Question 64Single Answer

The transfer function of a second order real system with a perfectly flat magnitude response of unity has a pole at (2 – j3). List all the poles and zeros.

A
Poles at (2 ± j3), no zeroes.
B
Poles at (±2 - j3), no zeroes.
C
Poles at (2 - j3),(-2 + j3) zeroes at (-2 – j3), (2 + j3).
D
Poles at (2 ± j3), zeroes at (-2 ± j3).

Question 65Single Answer

The presence of one of the following materials, in iron or steel for use as a magnetic material, tends to reduce the hysteresis loss

A
Carbon
B
Sulphur
C
Phosphorous
D
Silicon

Question 66Single Answer

The depth of penetration of a wave in a lossy dielectric increases with increasing

A
Conductivity
B
Permeability
C
Wavelength
D
Permittivity

Question 67Single Answer

Match List-I and List-II and select the correct answer using the code given below the lists:
List-I List-II
A.Carbon (Diamond) 1. Conducting
B.Silicon 2. Semiconducting
C.Tin (Grey) 3. Insulating
D.Lead

A
A B C D

3 2 1 1
B
1 2 1 3
C
3 1 2 1
D
1 1 2 3

Question 68Single Answer

It is possible to destroy the superconductivity of a material by applying

A
A strong magnetic field
B
A temperature much below the transition temperature
C
A strong electric field
D
A pressure below that of the atmosphere

Question 69Single Answer

Consider the following properties regarding insulation for cables:
1. A low specific resistance
2. High temperature withstand
3. High dielectric strength
Which of the above properties of insulation are correct while using cables?

A
1 and 2 only
B
1 and 3 only
C
2 and 3 only
D
1,2 and 3

Question 70Single Answer

The open loop poles of a third order unity feedback system are at 0, -1, -2, let the frequency corresponding to the point, where the root locus of the system transits to unstable region be K. now suppose we introduce a zero in the open loop transfer function at -3, while keeping all the earlier open loop poles intact. Which one of the following is correct about the point, where the root locus of the modified system transits to unstable region?

A
it corresponds to a frequency greater than K
B
it corresponds to a frequency less that K
C
it corresponds to a frequency K
D
Root locus of modified system never transits to unstable region

Question 71Single Answer

Which of the following moving particles cannot be deflected by magnetic fields?

A
α - Particles
B
Neutrons
C
Protons
D
Electrons

Question 72Single Answer

The Fermi level in an n-type semiconductor at zero degree kelvin lies

A
Below the donor level
B
Half-way between the conduction band and the donor level
C
Half-way between the conduction band and the valence level
D
Close to the valence band

Question 73Single Answer

According to free electron theory, electrons in a metal are subjected to

A
Constant potential
B
Sinusoidal potential
C
Square wave potential
D
Non-periodic potential

Question 74Single Answer

Controlled addition of group III element to an elemental semiconductor results in the formation of

A
Intrinsic semiconductor
B
n-type semiconductor
C
p-type semiconductor
D
Degenerate semiconductor

Question 75Single Answer

Phonons (Quanta of lattice vibration) obey

A
Maxwell distribution
B
Maxwell-Boltzmann distribution
C
Fermi-Dirac distribution
D
Bose-Einstein distribution

Question 76Single Answer

Did not you buy…………..when you went shopping?

A
any paper
B
much paper
C
no paper
D
a few paper

Question 77Single Answer

Consider the following standard symbols for two-port parameters :
1.h₁₂ and h₂₁ are dimensionless.
2.h₁₁ohms and B have dimensions of ohms.
3.BC is dimensionless.
4.C is dimensionless.
Which of the above are correct ?

A
1, 2 and 3 only
B
1, 2 and 4 only
C
3 and 4 only
D
1, 2, 3 and 4

Question 78Single Answer

An iron-cored choke coil has an equivalent resistance of 5Ω. It draws 10 A when the applied voltage is 240V, 50Hz. Its inductance and power factor respectively are

A
7.5 mH and 0.1 (lag)
B
74.7 mH and 0.1 (lag)
C
74.7 mH and 0.208 (lag)
D
7.5 mH and 0.208 (lag)

Question 79Single Answer

A voltage of 100 V is applied to an impedance of Z = (3 + j4) Ω. What are the values of active power, reactive power and volt-amperes respectively ?

A
1200 W, 1220 VAR and 2000 VA
B
1600 W, 1600 VAR and 2200 VA
C
1200 W, 1600 VAR and 2000 VA
D
1600 W, 1200 VAR and 2200 VA

Question 80Single Answer

The voltage across an impedance Z is 100∠15° V and the current through Z is 20∠-45° A. The active and the reactive powers in Z respectively are

A
1000 W and 1732 VAR
B
500 W and 1732 VAR
C
1000 W and 6000 VAR
D
500 W and 6000 VAR

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Latest ISRO Scientist EE Exam Question (Objective Questions), MCQ in English

Electrical

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Electrical

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