Question for IISC Technical Assistant 2026 - Quiz / Questions / MCQ

Objective Questions

Latest IISC Technical Assistant Exam Question (Objective Questions), MCQ in English

Subjects : Maths, Physics, Chemistry

Question Bank IISC Technical Assistant Paper B (Physics, Chemistry) Exam - English

Back to Exam

Maths

Question 1Single Answer

The elements of the set {x : x is an integer, x² : 4} can be represent as .....Z..... . Here, Z refers to

A
{–2, 2}
B
{–1, 0, 1}
C
{–2, –1, 0, 1, 2}
D
{0, 1, 2}

Question 2Single Answer

A
B
C
D
None of these

Question 3Single Answer

If Y = {x : x is a positive factor of the number 2p – 1(2p – 1), where 2p – 1 is a prime number}, then Y can be represent in roster form as

A
{2}
B
{1, 2}
C
{1, 2, 22, ....., 2p – 1}
D
{1, 2, 22, 23,.... 2p – 1, (2p – 1)}

Question 4Single Answer

The set {x : x is a positive integer less than 6 and 3x – 1 is an even number} in roster form is

A
{1, 2, 3, 4, 5}
B
{1, 2, 3, 4, 5, 6}
C
{2, 4, 6}
D
{1, 3, 5}

Question 5Single Answer

If A

B and A

B, then

A
A is called a proper subset of B
B
A is called a super set of B
C
A is not a subset of B
D
B is a subset of A

Question 6Single Answer

The number of non-empty subsets of the set{1, 2, 3, 4} is

A
15
B
14
C
16
D
17

Question 7Single Answer

The number of elements of the power set of a set containing m elements is

A
2^m – 1
B
m
C
m²
D
2^m

Question 8Single Answer

If A = {x : x = n², n = 1, 2, 3}, then number of proper subsets is

A
3
B
8
C
7
D
None of these

Question 9Single Answer

If A = {x : x = 4n + 1, 2 £ n £ 5},then number of subsets of A is

A
16
B
15
C
4
D
None of these

Question 10Single Answer

Let A and B be two non-empty subsets of a set X such that A is not a subset of B, then

A
A is always a subset of the complement of B
B
B is always a subset of A
C
A and B are always disjoint
D
A and the complement of B are always non-disjoint

Question 11Single Answer

Which of the following is/are empty set?
A = {x : x2 + x + 1 = 0 and x Î Z} B = {x : x is a prime number and 19 < x < 23}

A
A
B
B
C
Both A and B
D
None of the above

Question 12Single Answer

The set {x : x⁴ = 1 and x

R} is .....X.... set. Here, X refers to

A
empty
B
finite
C
infinite
D
singleton

Question 13Single Answer

The universal set for the sets
A = {x : x² – 5x + 6 = 0} and
B = {x : x² – 3x + 2 = 0} having least number of elements is

A
{1, 2}
B
{1, 3}
C
{1, 2, 3}
D
{0, 1, 2, 3}

Question 14Single Answer

If A = {1, 2, 3}, B = {x € R : x2 – 2x + 1 = 0},

C = {1, 2, 2, 3} and

D = {x € R : x3 – 6x2 + 11x – 6 = 0}, then the equal sets are

A
A and B
B
A and C
C
A, B and C
D
A, C and D

Question 15Single Answer

If A = (–3, 5) and B = [–7, 9], then

A
A = B
B
A B
C
B A
D
None of these

Question 16Single Answer

Two finite sets have m and n elements, respectively. The total number of subsets of first set is 56 more than the total number of subsets of the second set. The value of m and n respectively are

A
7, 6
B
5, 1
C
6, 3
D
8, 7

Question 17Single Answer

Combine terms: 12a + 26b - 4b – 16a .

A
4a + 22b
B
-28a + 30b
C
-4a + 22b
D
28a + 30b

Question 18Single Answer

The average of first 50 natural numbers is ………… .

A
25.30
B
25.5
C
25.00
D
12.25

Question 19Single Answer

60 Times of 8 Equals to

A
480
B
300
C
250
D
400

Question 20Single Answer

Consider the sets

A = {x : x is a real number and x² + 1 = 0}

B = {x : x is a real number and x² – 16 = 0}

C = {x : x is a real number and x² = x + 2}

Which of the following is are null set ?

A
A
B
A and B
C
A and C
D
A, B and C

Physics

Question 21Single Answer

In ruby laser, the stimulated emission is due to transition from

A
metastable state to any lower state
B
any higher state of lower state
C
metastable state to ground state
D
any higher state to ground state

Question 22Single Answer

A direct current I flows along the length of an infinitely long straight thin walled pipe, then the magnetic field is

A
uniform throughout the pipe not zero
B
zero only along the axis of the pipe
C
zero at any point inside the pipe
D
maximum at the centre and minimum at the edge

Question 23Single Answer

convex lens made of glass has focal length 0.15m in air. If the refractive index of glass is 3/2, and that of water is 4/3 the focal length of lens when immersed in water is

A
0.45 m
B
0.15 m
C
0.30 m
D
0.6 m

Question 24Single Answer

Two sources are said to be coherent if they produce waves

A
having a constant phase difference
B
of equal wavelength
C
of equal speed
D
having same shape of wavefront

Question 25Single Answer

Three resistors 1 Ω, 2 Ω, 3Ω resistor a 3 V battery is connected. The current through 3 Ω resistor is -

A
0.75 A
B
1 A
C
2 A
D
1.5 A

Question 26Single Answer

In a common emitter amplifier the input signal is applied across

A
anywhere
B
emitter-collector
C
collector-base
D
base-emitter

Question 27Single Answer

Adding detergents to water helps in removing dirty greasy stains. This is because
1. It increases greasy stains. This is because
2. It decreases the oil-water surface tension
3. It increases the viscosity of the solution
4. Dirt is held suspended surrounded by detergent molecules

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

Question 28Single Answer

Choose the correct statement (a) for a cricket ball that is spinning clockwise through air
S1 : Statemlines of air are symmetric around the ball.
S2 : The velocity of air above the ball relative to it is larger than that below the ball.
S3 : The velocity of air above the ball relative to it is smaller than that below the ball.
S4 : There is a net upward force on the ball.

A
S1,S2 and S4
B
S2 and S4
C
S4 only
D
S3 only

Question 29Single Answer

Ferromagnetic materials used in a transformer must have

A
low permeability and high hysterisis loss
B
high permeability and low hysterisis loss
C
high permeability and high hysterisis loss
D
low permeability and low hysterisis loss

Question 30Single Answer

According to Newton’s corpuscular theory, the speed of light is

A
same in all the medium
B
lesser in rarer medium
C
lesser in denser medium
D
independent of the medium

Question 31Single Answer

For the constructive interference the path difference between the two interfering waves must be equal to

A
(2𝜋 + 1)λ
B
2n𝜋
C
nλ
D
n

Question 32Single Answer

The accurate measurement of emf can be obtained using

A
multimeter
B
voltmeter
C
voltameter
D
potentiometer

Question 33Single Answer

A person, with outstretched arms, is spinning on a rotating stool. He suddenly brings his arms down to his sides. Which the following is true about his kinetic energy K and angular momentum L?

A
Both K and L increase
B
Both K and L remain unchanged
C
K remains constant, L increases
D
K increases but L remains constant

Question 34Single Answer

Which of the following is not a thermodynamic coordinate?

A
Gas constant (R)
B
Pressure (p)
C
Volume (V)
D
Temperature (T)

Question 35Single Answer

An antenna uses electromagnetic waves of frequency 5 MHz . For proper working, the size of the antenna should be

A
300 m
B
3 km
C
15 m
D
15 km

Question 36Single Answer

The amount of energy released when one microgram of matter is annihilated is

A
25 kWh
B
9 x 10¹⁰ kWh
C
3 x 10¹⁰ kWh
D
0.5 x 10⁵ kWh

Question 37Single Answer

The number of significant figures in the numbers 4.8000 x 10⁴ 48000.50 are respectively

A
5 and 6
B
5 and 7
C
2 and 7
D
2 and 6

Question 38Single Answer

β-decay means emission of electron from

A
innermost electron orbit
B
a stable nucleus
C
outermost electron orbit
D
radioactive nucleus

Question 39Single Answer

An electric heater rated 220 V and 550 W is connected to AC mains. The current drawn by it is

A
0.8 A
B
2.5 A
C
0.4 A
D
1.25 A

Question 40Single Answer

A string is wound round the rim of a mounted flywheel of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cord. Neglecting friction and mass of the string, the angular acceleration of the wheel is

A
50 s^-2
B
25 s^-2
C
12.5 s^-2
D
6.25 s^-2

Question 41Single Answer

A billiards player hits a stationary ball by an identical ball to pocker the target ball in a corner pocket that is at an angle of 35^o with respect to the direction of motion of the first ball. Assuming the collision as elastic and that frictional and rotational motions are not important, the angle made by the target ball with respect to the imcoming ball is

A
35^o
B
50^o
C
55^o
D
60^o

Question 42Single Answer

A body of mass 0.05 kg is observed to fall with an acceleration of 9.5 ms^-2. The opposing force of air on the body is (g = 9.8 ms^-2)

A
0.015 N
B
0.15 N
C
0.030 N
D
zero

Question 43Single Answer

The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called

A
emulsions
B
gels
C
foams
D
liquid crystals

Question 44Single Answer

In fog, photographs of the objects taken with infrared radiations are more clear than those obtained during visible light because

A
I-R radiation has lesser wavelength than visible radiation
B
scattering of I-R light is more the object is less
C
the intensity of I-R light is more the object is less
D
scattering of I–R light is less than visible light

Question 45Single Answer

Three concurrent co-planar forces 1 N, 2 N and 3 N acting along different directions on a body

A
can keep the body in equilibrium if 1 N and 3 N act at right angle
B
can keep the body in equilibrium if 1 N and 2 N act at right angle
C
cannot keep the body in equilibrium
D
can keep the body in equilibrium in 1 N and 3 N act at an acute angle

Question 46Single Answer

Sound waves transfer

A
only energy not momentum
B
energy
C
momentum
D
both (a) and (b)

Question 47Single Answer

G P Thomson experimentally confirmed the existence of matter waves by the phenomena

A
diffraction
B
refraction
C
polarisation
D
scattering

Question 48Single Answer

The resistance of a wire at 300 K is found to be 0.3 Ω. If the temperature coefficient of resistance of wire is 1.5 x 10^-3 K^-1, the temperature at which the resistance becomes 0.6 Ω is

A
720 K
B
345 K
C
993 K
D
690 K

Question 49Single Answer

Two luminous points sources separated by a certain distance are at 10 km from an observer. If the aperture of his eye is 2.5 x 10^-3 m and the wavelength of light used is 500 nm the distance of separation between the point sources just seen to be resolved is

A
12.2 m
B
24.2 m
C
2.44 m
D
1.22 m

Question 50Single Answer

A door 1.6 m wide requires a force of N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distance from the hinges for opening or closing the door is

A
1.2 N
B
3.6 N
C
2.4 N
D
4 N

Important Questions Package

IISC Technical Assistant Exam Online Question Bank Package

Buy IISC Technical Assistant Important Questions, MCQ, question answer in Hindi & English. It will help you to score high marks in IISC Technical Assistant question bank 2026 in Online, PDF & Print study material.

+ Free Monthly Current Affairs, GK & more PDF Download

Sr.	Package Name	Amount
1.	IISC Technical Assistant Paper A Exam - Hindi Description : 2500 Question with Answer.	₹271 ~~[₹500]~~
2.	IISC Technical Assistant Paper A Exam - English Description : 2500 Question with Answer.	₹271 ~~[₹500]~~
3.	IISC Technical Assistant Paper B (Physics, Chemistry) Exam - English Description : 1500 Question with Answer.	₹181 ~~[₹500]~~
4.	IISC Technical Assistant Paper B (Physics, Chemistry) Exam - Hindi Description : 1500 Question with Answer.	₹181 ~~[₹500]~~

Physics

Question 51Single Answer

0.1 m³ of water at 80^o C. The final temperature of the mixture is

A
65^oC
B
70^oC
C
60^oC
D
75^oC

Question 52Single Answer

The spectral series of the hydrogen atom that lies in the visible region of the electromagnetic spectrum

A
Paschen
B
Balmer
C
Lyman
D
Brackett

Question 53Single Answer

A resistor and a capacitor are connected inseries with an AC source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, then applied voltage is

A
13 V
B
17 V
C
5 V
D
12 V

Question 54Single Answer

The amount of heat energy radiated by a metal at temperature T is E. When the temperature is increased to 3T, energy radiated is

A
8 1E
B
9 E
C
3 E
D
27 E

Question 55Single Answer

A man, of mass 60 kg, is riding in a lift. The weights of the man, when the lift is accelerating upwards and down wards at 2m/s²are respectively (Taking g=2m/s²)

A
720 N and 480 N
B
480 N and 720 N
C
600 N and 800 N
D
None of these

Question 56Single Answer

A galvanometer of resistance 240 Ω allows only 4% of the main current after connecting a shunt resistance. The value of the shunt resistance is

A
10 Ω
B
20 Ω
C
8 Ω
D
5 Ω

Question 57Single Answer

The phenomena in which proton flips is

A
nuclear magnetic resonance
B
lasers
C
radioactivity
D
nuclear fusion

Question 58Single Answer

According to the quark model, it is possible to build all the hadrons using

A
2 quarks and 3 antiquarks
B
1 quarks and 2 antiquarks
C
3 quarks and 3 antiquarks
D
2 quarks and 2 antiquarks

Question 59Single Answer

The surface temperature of the stars is determined using

A
Planck’s law
B
Wien’s displacement law
C
Rayleigh-Jeans law
D
Kirchhoff’s law

Question 60Single Answer

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side of the principal axis, the intensity of light

A
first decreases and then increases
B
continuously increases
C
continuously decreases
D
first increases and then decreases

Chemistry

Question 61Single Answer

10^-6 M NaOH is diluted 100 times. The pH of the diluted base is

A
between 7 and 8
B
between 5 and 6
C
between 6 and 7
D
between 10 and 11

Question 62Single Answer

In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under STP condition. The current to be passed is

A
1.93 A
B
9.65 A
C
19.3 A
D
0.965 A

Question 63Single Answer

The one which decreases with dilution is

A
molar conductance
B
conductance
C
specific conductance
D
equivalent conductance

Question 64Single Answer

Vapour pressure of pure ‘A’ is 70 mm of Hg at 25^oC. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. if the vapour pressure of the solution is 84 mm of Hg at 25^oC, the vapour pressure of pure ‘B’ at 25^oC is

A
28 mm
B
56 mm
C
70 mm
D
140 mm

Question 65Single Answer

A 6% solution of urea is isotonic with

A
1 M solution of glucose
B
0.05 M solution of glucose
C
6% solution of glucose
D
25% solution of glucose

Question 66Single Answer

In countries nearer to polar region, the roads are sprinkled with CaCl₂. This is

A
to minimise the wear and tear of the roads
B
to minimise the snow fall
C
to minimise pollution
D
to minimise the accumulation of dust on the road

Question 67Single Answer

A compound of ‘A’ and ‘B’ crystallises in a cubic lattice in which ‘A’ atoms occupy the lattice points at the corners of the cube. The ‘B’ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is

A
AB₂
B
A₂B
C
AB
D
AB₃

Question 68Single Answer

In electrophilic aromatic substitution reaction, the nitro group is meta directing because it

A
decreases electron density at ortho and para positions
B
decreases electron density at meta position
C
increases electron density at meta position
D
increases electron density at ortho and para position

Question 69Single Answer

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

A
PCI₅
B
PCI₃
C
SOCl₂ in presence of pyridine
D
dry HCl in the presence of anhydrous ZnCl₂

Question 70Single Answer

The carbon bond length in benzene is

A
in between C₂H₆ and C₂H₄
B
same as in C₂H₄
C
in between C₂H₆ and C₂H₂
D
in between C₂H₄ and C₂H₂

Question 71Single Answer

The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is

A
methanal
B
propanal
C
propanone
D
ethanal

Question 72Single Answer

An organic compound x is oxidised by using acidified K₂Cr₂O₇. The product obtained reacts with phenyl hydrazine but does not answer silver mirror test. The possible structured of X is

A
CH₃CH₂OH
B
CH₃ – C – CH₃
C
(CH₃)₂CHOH
D
CH₃CHO

Question 73Single Answer

Arrange the following in the increasing of their. Basic strengths CH₃NH₂, (CH₃)₂NH, (CH₃)₂N, NH₃

A
NH₃, < (CH₃)₃N < (CH₃)₂NH < CH₃NH₂
B
NH₃ < (CH₃)₃N < CH₃NH₂ < (CH₃)₂NH
C
(CH₃)₃N < NH₃ < CH₃NH₂ < (CH₃)₂NH
D
CH₃NH₂ < (CH₃)₂NH < (CH₃)₃N , NH₃

Question 74Single Answer

The one which has least iodine value is

A
sunflower oil
B
ginger oil
C
ghee
D
groundnut oil

Question 75Single Answer

A diabetic person carries a packet of glucose with him always, because

A
glucose reduces the blood sugar level slowly
B
glucose increases the blood sugar level slowly
C
glucose reduces the blood sugar level
D
glucose increases the blood sugar level almost instantaneously

Question 76Single Answer

There are 20 naturally occurring among acids. The maximum number of tripeptides than can be obtained is

A
8000
B
6470
C
7465
D
5360

Question 77Single Answer

At what temperature ill the RMS velocity of SO₂ be the same as that of O₂at 303 K ?

A
403 K
B
303 K
C
606 K
D
273 K

Question 78Single Answer

Phenol is treated with bromine water and shaken well. The white precipitate formed during the process is

A
m–bromophenol
B
2, 4, 6 tribromophenol
C
2-4 dibromophenol
D
A mixture of o-and p-bromophenols

Question 79Single Answer

In thermite process the metal used as reducing agent is:

A
Nickel
B
Zinc
C
Sodium
D
Aluminium

Question 80Single Answer

Which of the following compounds on boiling with alkaline KMnO₄and subsequent acidification will not give benzoic acid?

A
Benzyl alcohol
B
Acetophenone
C
Anisole
D
Toluene

Question 81Single Answer

The base present in DNA, but not in RNA is:

A
Guanine
B
Adenine
C
Uracil
D
Thymine

Question 82Single Answer

The total number of lattice arrangements in different crystal system is:

A
7
B
3
C
8
D
14

Question 83Single Answer

Alcoholic potash is used to bring about :

A
Dehydrogenation
B
Dehydration
C
Dehydrohalogenation
D
Dehalogenation

Question 84Single Answer

Which of the following is the correct statement?

A
Order of a reaction has always an integral value
B
Mechanism of a reaction proposed is always final
C
Zero order reactions are multi-step reactions
D
Order of reaction can be predicted even without knowing the rate law

Question 85Single Answer

The unit of quantity of electricity is:

A
Ohm
B
Ampere
C
Coulomb
D
Volt

Question 86Single Answer

Which of the following organic compounds answers both iodoform test and fehling’s test ?

A
Methanal
B
Ethanol
C
Propane
D
Ethanal

Question 87Single Answer

10 dm³ of N₂ gas and 10 dm³ of gas X at the same temperature and pressure contain the same number of molecules.

A
NO
B
H₂
C
CO₂ or CO
D
All of these

Question 88Single Answer

When the electrons of hydrogen atoms return to L shell from shells of higher energy, we get a series of lines in the spectrum. This series is called

A
Balmer series
B
Lyman series
C
Bracket series
D
Paschen series

Question 89Single Answer

The alcohol obtained by the hydrolysis of oils and fats is:

A
Glycol
B
Glycerol
C
Propanol
D
Pentanol

Question 90Single Answer

Which of the following alloys is used for making magnets for hearing aids?

A
Alnico
B
German silver
C
Invar
D
Monel metal

Question 91Single Answer

One dm³ of 2M ethanoic acid is mixed with one dm³ of 3M ethanol to form an easter
CH₃COOH + C₂H₅OH → CH₃COOC₂H₅ +H₂O
The decrease in the initial rate if each solution is diluted with an equal volume of water would be

A
2 times
B
4 times
C
0.25 times
D
0.5 times

Question 92Single Answer

Which one of the following can be classified as a Bronstead base?

A
NO₃^-
B
H₃O⁺
C
CH₃COOH
D
NH₄⁺

Question 93Single Answer

Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is minimum in the case of :

A
CaCl₂
B
NaCl
C
AlCl₃
D
Na₂SO₄

Question 94Single Answer

Aluminium displaces hydrogen from acids, but copper does not. A Galvanic cell prepared by combining Cu/Cu²⁺ and Al/Al³⁺ has an emf of 2.0 V at 298 K. If the potential of copper electrode is +0.34 V, that of aluminium electrode is:

A
– 2.3 V
B
+ 2.34 V
C
– 1.66 V
D
+ 1.66 V

Question 95Single Answer

1.5 moles of O₂ combine with Mg to form the oxide MgO. The mass of Mg that has combined is (Mg = 24):

A
72 g
B
36 g
C
48 g
D
24 g

Question 96Single Answer

How much of NaOH is required to neutralize 1500 cm³ of 0.1 N HCI?(Na = 23):

A
60 g
B
6 g
C
4 g
D
40 g

Question 97Single Answer

The boiling point of water is exceptionally high because:

A
Water molecule is not linear
B
Water molecule is linear
C
There is covalent bond between H and O
D
Water molecules associate due to hydrogen bonding

Question 98Single Answer

P₄O₁₀ is not used with to dry NH₃ gas because:

A
P₄O₁₀ is basic and NH₃ is acidic
B
P₄O₁₀ is acidic and NH₃ is basic
C
P₄O₁₀ is not a drying agent
D
P₄O₁₀ reacts with moisture in NH₃

Question 99Single Answer

A radioactive isotope has a half-life of 10 years. What percentage of the original amount of it remain after 20 years:

A
1
B
12.5
C
8
D
25

Question 100Single Answer

75% of a first order reaction is completed in 30 minutes. What is the time required for 93.75% of the reaction (in minutes)?

A
45
B
120
C
90
D
60

Back to Exam

Latest IISC Technical Assistant Exam Question (Objective Questions), MCQ in English

Maths

Physics

IISC Technical Assistant Exam Online Question Bank Package

Physics

Chemistry

Quick View