A person standing at point A travels to point B and then travelled back to A. Then the

C) Displacement is zero but distance travelled is not zero

A car can accelerate through a road because of which external force ?

C) Frictional force of the road

A cricket player draws his hands backwards while catching a fast ball to

A) reduce the rate of change of momentum

When an object is submerged in a liquid at rest, the force exerted by the liquid on the object will be

A) Always normal to the object surfaces

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100 questions with answersProvisional keyIndustries and Commerce

Laboratory Assistant Common Facility Service Centre - Industries and Commerce question paper 2023

Industries and Commerce

Date of test: 05-04-2023
Question paper code: 19/2023/OL
Category No.: 057/2019
Questions: 100
Answer key: Provisional Answer Key
Exam mode: Online (computer based)

Provisional key. Kerala PSC can change answers after reviewing complaints; the final key decides the marks.

See questions with answers Practise as a mock test

Source: Kerala PSC (keralapsc.gov.in) · official document· Last updated 25 Sept 2026· How we check content

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All 100 questions with answers

Tap an option to check yourself, or open the answer. Answers follow the official Kerala PSC answer key.

1.
Which of the following is not an SI unit ?
Show answer and explanation
Answer: D —
Hour
Hour is a unit of time, but the SI unit of time is second.
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2.
A person standing at point A travels to point B and then travelled back to A. Then the
Show answer and explanation
Answer: C —
Displacement is zero but distance travelled is not zero
Since the person returns to the starting point A, the shortest distance between initial and final position (displacement) is zero, while total path length (distance) is non-zero.
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3.
SI unit of speed and velocity are
Show answer and explanation
Answer: A —
Same
Both speed and velocity are measured in meters per second ( $m/s$ ) in the SI system.
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4.
Area under the velocity-time graph of a moving object gives
Show answer and explanation
Answer: B —
Displacement of the object
The area under a velocity-time graph represents the displacement of the object.
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5.
A car can accelerate through a road because of which external force ?
Show answer and explanation
Answer: C —
Frictional force of the road
Friction between the tires and the road provides the external force necessary to accelerate the car.
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6.
A cricket player draws his hands backwards while catching a fast ball to
Show answer and explanation
Answer: A —
reduce the rate of change of momentum
Pulling hands back increases the time taken to stop the ball, thereby reducing the rate of change of momentum and the force felt.
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7.
According to which law we say force always occur in pairs ?
Show answer and explanation
Answer: C —
Newtons third law
Newton's third law states that to every action, there is an equal and opposite reaction, meaning forces occur in pairs.
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8.
The force experienced by Earth due to Sun is along the vector joining the two and hence it is a
Show answer and explanation
Answer: A —
Central force
Gravitational forces act along the line joining the centers of two masses, making them central forces.
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9.
Who proposed the universal law of gravitation ?
Show answer and explanation
Answer: D —
Newton
Sir Isaac Newton proposed the universal law of gravitation.
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10.
A person jumped out of an airplane ﬂying at high altitude will experience
Show answer and explanation
Answer: B —
Weightlessness
During free fall, a person experiences a state of weightlessness.
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11.
Examples of ﬂuids are
Show answer and explanation
Answer: C —
All liquids and gases
Both liquids and gases can flow and are therefore classified as fluids.
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12.
When an object is submerged in a liquid at rest, the force exerted by the liquid on the object will be
Show answer and explanation
Answer: A —
Always normal to the object surfaces
A liquid at rest exerts force perpendicular (normal) to any surface in contact with it.
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13.
The pressure P at a depth h below the surface of a liquid having density $ho$ , open to the atmosphere is greater than the atmospheric pressure by an amount
Show answer and explanation
Answer: C —
$P = h\rho g$
Hydrostatic pressure increase with depth is given by $P = h\rho g$ .
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14.
Hydraulic brakes work on the principle of
Show answer and explanation
Answer: A —
Pascal's law
Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, which is the principle behind hydraulic brakes.
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15.
The SI unit of viscosity is
Show answer and explanation
Answer: D —
$N m s^{-2}$
The SI unit of dynamic viscosity is pascal-second ( $Pa\cdot s$ ) or $N\cdot s/m^2$ .
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16.
What is the work done during the time when a weightlifter holding a 100 kg mass steadily on his shoulder for 5 second ?
Show answer and explanation
Answer: D —
Zero
Since there is no displacement while holding the mass steady, the work done is zero.
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17.
36 km/h is equal to
Show answer and explanation
Answer: B —
10 m/s
$36 \text{ km/h} = 36 \times \frac{5}{18} \text{ m/s} = 10 \text{ m/s}$ .
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18.
The rate at which work done is
Show answer and explanation
Answer: A —
Power
Power is defined as the rate of doing work or rate of transfer of energy.
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19.
A virtual and erect image of the same size as that of the object is always formed by a
Show answer and explanation
Answer: C —
Plane mirror
A plane mirror always produces a virtual, erect image of the same size as the object.
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20.
What will be the height of the image if an object of height 4 cm is placed in front of a concave mirror at a distance 10 cm away from it and the image is formed 20 cm away from the mirror ?
Show answer and explanation
Answer: D —
8 cm and inverted
Magnification $m = -v/u = -(-20)/(-10) = -2$ . Height of image = $m \times \text{height of object} = -2 \times 4 = -8 \text{ cm}$ (8 cm and inverted).
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21.
Field of view is maximum for
Show answer and explanation
Answer: B —
Convex mirror
Convex mirrors have a wider field of view compared to plane or concave mirrors, which is why they are used as rear-view mirrors.
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22.
As per the new cartesian sign convention, object and image distances for a spherical mirror is taken with respect to the origin as
Show answer and explanation
Answer: C —
Pole of the mirror
According to the Cartesian sign convention, the pole of the mirror is taken as the origin.
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23.
Refractive index of normal optical materials is always
Show answer and explanation
Answer: A —
Greater than one
The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium. Since light travels fastest in a vacuum, the refractive index of any material is greater than 1.
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24.
The principle of light propagation through an optical fiber is
Show answer and explanation
Answer: D —
Total internal reflection
Optical fibers work on the principle of total internal reflection, allowing light to travel long distances with minimal loss.
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25.
The SI unit of power of a lens is
Show answer and explanation
Answer: B —
Dioptre
The SI unit of the power of a lens is the dioptre (D), which is the reciprocal of the focal length in meters.
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26.
When we look at nearer objects, lenses in our eyes are contracted and
Show answer and explanation
Answer: A —
Curvature of the lens increases and focal length decreases
To focus on near objects, the ciliary muscles contract, increasing the curvature of the lens, which decreases its focal length.
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27.
The persistence of vision for human eye is approximately
Show answer and explanation
Answer: B —
1/16 s
Persistence of vision is the phenomenon where an image remains on the retina for about 1/16th of a second.
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28.
Mechanical waves are
Show answer and explanation
Answer: C —
Can be either longitudinal or transverse
Mechanical waves require a medium and can be longitudinal (like sound waves in air) or transverse (like waves on a string).
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29.
Distance between two consecutive points with the same phase of a wave is
Show answer and explanation
Answer: D —
Wavelength
Wavelength is defined as the distance between two consecutive points in the same phase of a wave.
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30.
Acoustic echo happens due to
Show answer and explanation
Answer: A —
Reflection of sound
An echo is the repetition of sound caused by the reflection of sound waves from a surface.
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31.
According to Joule's law, the heat generated in a current carrying conductor is given by
Show answer and explanation
Answer: A —
H = I^2Rt
Joule's law of heating states that the heat produced in a conductor is $H = I^2Rt$ .
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32.
If two equal resistances R and R are connected in series and parallel configurations, then which statement is correct ?
Show answer and explanation
Answer: B —
Effective resistance of parallel combination is R/2
For two equal resistors R in parallel, the effective resistance is $\frac{R \times R}{R + R} = \frac{R}{2}$ .
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33.
Alloy of tin and lead is generally used as fuse wires because
Show answer and explanation
Answer: B —
It has low melting point
Fuse wires are made of alloys with low melting points so that they melt and break the circuit when excessive current flows.
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34.
Electric power consumed by an electrical appliance can be measured using
Show answer and explanation
Answer: C —
Using a voltmeter and an ammeter
Electric power is calculated as $P = VI$ . Therefore, both voltage (V) and current (I) must be measured.
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35.
In an AC generator, the insulated conducting wire wound on a soft iron core is called
Show answer and explanation
Answer: D —
Armature
The armature is the rotating coil in an AC generator, consisting of insulated wire wound on a soft iron core.
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36.
If a transformer has 500 turns in its primary and 5000 turns in secondary, what will be the secondary voltage, if the primary voltage is 5 V
Show answer and explanation
Answer: A —
50 V
The transformer equation is $\frac{V_s}{V_p} = \frac{N_s}{N_p}$ . $\frac{V_s}{5} = \frac{5000}{500} = 10$ . $V_s = 5 \times 10 = 50$ V.
Report a mistake
37.
Transmission loss during the distribution of electricity from power stations is generally reduced by
Show answer and explanation
Answer: A —
Decreasing the current and increasing the voltage
Power loss $I^2R$ is minimized by stepping up the voltage and decreasing the current for long-distance transmission.
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38.
In an agricultural ﬁeld a 750 W water pump is used for 3 hours every day. The daily consumption shown by the watt hour meter will be
Show answer and explanation
Answer: D —
2.25 unit
Energy = Power $\times$ time = $750 \text{ W} \times 3 \text{ hours} = 2250 \text{ Wh} = 2.25 \text{ kWh}$ (units).
Report a mistake
39.
Magnetic ﬁeld due to a current ﬂowing through a circular loop is proportional to
Show answer and explanation
Answer: C —
Both (1) and (2)
Magnetic field at the center of a circular loop is directly proportional to both the current and the number of turns.
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40.
In terms of working principle, which one among the following is diﬀerent from others ?
Show answer and explanation
Answer: C —
Microwave oven
Microwave ovens work on dielectric heating using electromagnetic microwaves, whereas the others work on Joule heating (resistance heating).
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41.
Electron was discovered by
Show answer and explanation
Answer: B —
J J Thomson
J.J. Thomson discovered the electron in 1897.
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42.
The chargeless particle present inside the nucleus of an atom is
Show answer and explanation
Answer: C —
Neutron
Neutrons are neutral (chargeless) particles found in the atomic nucleus.
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43.
The atomic number of an atom is
Show answer and explanation
Answer: A —
Number of electrons/protons in an atom
Atomic number represents the number of protons (or electrons in a neutral atom).
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44.
The atomic number of an atom is 17 and mass number is 35. The number of protons, neutrons and electrons in the atom respectively are
Show answer and explanation
Answer: D —
17, 18, 17
Protons = 17, Electrons = 17, Neutrons = Mass number - Atomic number = $35 - 17 = 18$ .
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45.
Among the following, which pair of atoms are isobars
Show answer and explanation
Answer: A —
$_{18}Ar^{40}$ and $_{20}Ca^{40}$
Isobars are atoms with the same mass number but different atomic numbers.
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46.
How many groups and periods are there in modern periodic table ?
Show answer and explanation
Answer: D —
18 groups and 7 periods
The modern periodic table has 18 vertical columns (groups) and 7 horizontal rows (periods).
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47.
The inert element among the following is
Show answer and explanation
Answer: C —
Helium
Helium is a noble gas and is chemically inert.
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48.
The main shell electronic conﬁguration of Fluorine atom is (Atomic number of Fluorine = 9)
Show answer and explanation
Answer: B —
2, 7
Fluorine has 9 electrons, distributed as 2 in the K shell and 7 in the L shell.
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49.
Trend of atomic size along the period and down the group.
Show answer and explanation
Answer: B —
Decreases along the period and increases down the group
Atomic radius decreases across a period due to increasing effective nuclear charge and increases down a group due to the addition of new electron shells.
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50.
Choose the correct pairs of elements with symbol\n(i) Magnesium - Mg\n(ii) Aluminium - Ar\n(iii) Chlorine - Cl\n(iv) Potassium - Pt
Show answer and explanation
Answer: C —
Only i and iii
Magnesium is Mg and Chlorine is Cl. Aluminium symbol is Al (Ar is Argon), Potassium symbol is K (Pt is Platinum).
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51.
The oxidation state of H in metal hydrides is
Show answer and explanation
Answer: D —
−1
In metal hydrides (like NaH), hydrogen exhibits a -1 oxidation state.
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52.
Catalyst used in the synthesis of sulphuric acid is
Show answer and explanation
Answer: D —
Vanadium pentoxide
Vanadium pentoxide ( $V_2O_5$ ) is used as a catalyst in the Contact process for sulfuric acid synthesis.
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53.
The bond present in NaCl is
Show answer and explanation
Answer: A —
Ionic bond
Sodium chloride ( $\text{NaCl}$ ) is formed by electrostatic attraction between ions, which is an ionic bond.
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54.
The sour taste of tamarind is due to the presence of
Show answer and explanation
Answer: C —
T artaric acid
Tamarind contains tartaric acid, which gives it its characteristic sour taste.
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55.
NaOH + HCl $\rightarrow$ A + B. Identify A and B
Show answer and explanation
Answer: A —
A is NaCl and B is $H_2O$
Neutralization of sodium hydroxide with hydrochloric acid yields sodium chloride and water.
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56.
The major mineral present in Chavara barrier beach in Kerala which is used for the manufacturing of $TiO_2$ is
Show answer and explanation
Answer: D —
Ilmenite
Ilmenite is the major mineral found in Chavara beach sands used for titanium dioxide production.
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57.
The ore of some metals are given below. Pick the correct match.
Show answer and explanation
Answer: A —
Al - Bauxite
Bauxite is a primary ore of aluminium.
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58.
The most abundant element in earth's crust is
Show answer and explanation
Answer: C —
Oxygen
Oxygen is the most abundant element by mass in the Earth's crust.
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59.
The depletion of ozone layer is caused by
Show answer and explanation
Answer: B —
Chloroﬂuorocarbons
Chlorofluorocarbons (CFCs) release chlorine radicals in the stratosphere, destroying ozone molecules.
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60.
Chlorine is prepared in the laboratory by heating
Show answer and explanation
Answer: A —
$MnO_2$ and concentrated HCl
Laboratory preparation of chlorine typically involves the oxidation of concentrated hydrochloric acid using manganese dioxide ( $MnO_2$ ).
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61.
Pick the correct statement about allotropes\ni. Compounds having same physical properties and diﬀerent chemical properties.\nii. Diﬀerent forms of same element.\niii. Compounds having diﬀerent physical properties and same chemical properties.\niv. Same forms of diﬀerent elements.
Show answer and explanation
Answer: C —
Only ii and iii
Allotropes are different structural forms of the same element that exhibit different physical properties but similar chemical properties.
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62.
The process of increasing atmospheric temperature as a result of increase in the amount of carbon dioxide in the atmosphere is called
Show answer and explanation
Answer: B —
Greenhouse eﬀect
The greenhouse effect refers to the trapping of heat by greenhouse gases like carbon dioxide, leading to global warming.
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63.
Find A and B in the following chemical reaction
Show answer and explanation
Answer: A —
A is HCl and B is $CO_2$
Reaction of metal carbonates with acids produces salt, water, and carbon dioxide.
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64.
Graphite is a good conductor of electricity. Which of the following statement justify your answer ?
Show answer and explanation
Answer: B —
Presence of free electron in graphite
In graphite, each carbon atom uses three valence electrons for covalent bonding, leaving one free mobile electron per atom which conducts electricity.
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65.
When a person inhale Carbon monoxide, the haemoglobin present in his blood reacts with carbon monoxide and form a compound which decreases the oxygen carrying capacity of haemoglobin and the person may die. Name the compound formed
Show answer and explanation
Answer: C —
Carboxy haemoglobin
Carbon monoxide binds strongly with hemoglobin to form stable carboxyhemoglobin, preventing oxygen transport.
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66.
Pick the correct statement about hydrocarbons
Show answer and explanation
Answer: D —
Hydrocarbons contains carbon and hydrogen
Hydrocarbons are organic compounds consisting entirely of carbon and hydrogen.
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67.
The IUPAC name of the organic compound given is
Show answer and explanation
Answer: B —
3-methylheptane
The longest carbon chain has 7 carbons (heptane) with a methyl substituent at position 3, giving 3-methylheptane.
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68.
Identify the wrong pair among the following\n(i) Alkane - hexane\n(ii) Alkene - ethene\n(iii) Alkyne - $C_2H_6$ \n(iv) Branched hydrocarbon - 3-methylpentene
Show answer and explanation
Answer: C —
(iii)
$C_2H_6$ is ethane (an alkane), not an alkyne. Alkynes have the general formula $C_n{H}_{2n-2}$ .
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69.
-COOH is the functional group present in
Show answer and explanation
Answer: D —
Carboxylic acids
The carboxyl group ( $-COOH$ ) is the characteristic functional group of carboxylic acids.
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70.
Marsh gas is
Show answer and explanation
Answer: B —
Methane
Methane is commonly known as marsh gas because it is produced in marshy areas by bacterial decomposition.
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71.
T o prevent the misuse of ethanol as a beverage, it is mixed with poisonous compounds to make use it in industries. The resulting product is called
Show answer and explanation
Answer: C —
Denatured spirit
Denatured spirit is ethanol rendered toxic or unpalatable by the addition of additives.
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72.
In a homologous series each member diﬀers in composition from one another by one
Show answer and explanation
Answer: A —
$-CH_2-$ group
Successive members of a homologous series differ by a methylene ( $-CH_2-$ ) unit.
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73.
When heated at high temperature, methane is decomposed to a ﬁnely divided powder which is used in making printer's ink. What is the name of that powder ?
Show answer and explanation
Answer: C —
Carbon black
Thermal decomposition of methane produces carbon black, used in inks and rubber reinforcement.
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74.
The gaseous hydrocarbon used for welding of metals is
Show answer and explanation
Answer: D —
Acetylene
Acetylene ( $C_2H_2$ ) burns with oxygen to produce an oxy-acetylene flame used for metal welding and cutting.
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75.
Absolute alcohol contains
Show answer and explanation
Answer: B —
99% ethanol
Absolute alcohol is nearly pure ethanol, typically around 99% concentration by weight.
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76.
The monomer of natural rubber is
Show answer and explanation
Answer: D —
Isoprene
Natural rubber is a polymer of isoprene (2-methyl-1,3-butadiene).
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77.
Saritha had fever and doctor advised her to take paracetamol 500 tablets thrice a day, because paracetamol is a
Show answer and explanation
Answer: C —
Antipyretic
Paracetamol is an antipyretic drug used to reduce fever.
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78.
NPK value of a fertilizer is 10 : 5 : 20. What does it mean ?
Show answer and explanation
Answer: C —
The fertilizer contains 10% N, 5% $P_2O_5$ and 20% $K_2O$
NPK ratings indicate percentages of nitrogen ( $N$ ), available phosphate ( $P_2O_5$ ), and soluble potash ( $K_2O$ ).
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79.
The natural polymer among the following is
Show answer and explanation
Answer: B —
Cellulose
Cellulose is a natural polymer found in plant cell walls.
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80.
Which vitamin is called as sunshine vitamin ?
Show answer and explanation
Answer: D —
Vitamin D
Vitamin D is synthesized in the skin upon exposure to sunlight, hence called the sunshine vitamin.
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81.
Colloidal stability of natural rubber latex is imparted by ________ layer around the rubber particles.
Show answer and explanation
Answer: C —
Phospholipo proteinic
A protective layer of phospholipids and proteins surrounds rubber particles to stabilize the natural latex emulsion.
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82.
The species name of Guayule rubber producing plant
Show answer and explanation
Answer: B —
Parthenium argentatum
Guayule is scientifically known as *Parthenium argentatum*.
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83.
Charles Goodyear invented the vulcanization of rubber in
Show answer and explanation
Answer: B —
1939
Charles Goodyear discovered vulcanization in the year 1839 (noted as 1939 in typo options from key, but historically 1839).
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84.
Identify the mixing mill size most suitable for laboratory uses
Show answer and explanation
Answer: A —
6” × 12” or 6” × 13”
Laboratory-scale two-roll mixing mills typically have roll dimensions of $6" \times 12"$ or $6" \times 13"$ .
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85.
Insert imbedded rubber articles in multiple numbers in a single moulding is usually accomplished using __________ technique.
Show answer and explanation
Answer: B —
Transfer moulding
Transfer moulding is well-suited for producing intricate molded articles with multiple inserts.
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86.
PET bottles are manufactured using ________ process.
Show answer and explanation
Answer: D —
Stretch Blow Moulding
PET bottles are produced via stretch blow moulding to provide high clarity and mechanical strength.
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87.
Choose the ASTM standard for vulcanized rubber properties in tension
Show answer and explanation
Answer: B —
ASTM D 412
ASTM D 412 specifies standard test methods for vulcanized rubber and thermoplastic elastomers in tension.
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88.
From 3° arc oscillating disc rheograph, the scorch safety time is taken as time taken for _______ unit rise in torque from minimum.
Show answer and explanation
Answer: D —
2
Scorch time ( $t_{s2}$ ) is typically measured as the time required for a 2-unit rise above minimum torque.
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89.
In compression set test under constant deﬂection of vulcanized rubber samples, the specimen is compressed to _________ of its actual height.
Show answer and explanation
Answer: C —
25%
Standard compression set testing often involves deflecting the specimen by 25% or 50% of its original height.
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90.
The standard for methods of test for vulcanized rubber according to BIS
Show answer and explanation
Answer: A —
IS 3400
IS 3400 specifies methods of test for vulcanized rubbers.
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91.
In the tear test of rubber samples, maximum strength is obtained when the sample direction is ______ to the compound milling direction.
Show answer and explanation
Answer: C —
Perpendicular
Tear resistance is usually maximum when the direction of tear is perpendicular to grain or milling orientation.
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92.
In ross ﬂexing test the rubber sample is repeatedly ﬂexed about the cut portion through ____ angle.
Show answer and explanation
Answer: D —
90°
In the Ross flexing test, the sample is flexed through an angle of 90 degrees.
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93.
MFI test is used to compare _________ with in a thermoplastic polymer type.
Show answer and explanation
Answer: B —
Grades
Melt Flow Index (MFI) tests are used to compare the flow properties and grades of thermoplastic polymers.
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94.
The moles of a solute in relation to the mass of the solution is known as
Show answer and explanation
Answer: A —
Molality
Molality is defined as the number of moles of solute per kilogram of solvent (or solution context depending on definition, but typically solvent mass).
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95.
Choose the chemical that dissolves in water rises $H_3O^+$ ion concentration in the solution
Show answer and explanation
Answer: C —
Acids
Acids dissociate in water to increase hydronium ion ( $H_3O^+$ ) concentration.
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96.
The coagulum prepared for DRC determination of NR latex is dried at _____ in a hot air oven.
Show answer and explanation
Answer: A —
70 ± 2°C
For Dry Rubber Content (DRC) determination, the coagulated sheet is dried at $70 \pm 2^{\circ}C$ in an oven.
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97.
The indicator used in the determination of alkalinity of latex when 0.1 N HCl used as titrant
Show answer and explanation
Answer: D —
Methyl red
Methyl red is used as an indicator for determining the alkalinity of preserved latex using hydrochloric acid.
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98.
The diﬀerence between DRC and TSC is known as
Show answer and explanation
Answer: B —
Non-rubber content
Total Solids Content (TSC) minus Dry Rubber Content (DRC) gives the non-rubber solid content.
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99.
During MST determination the mechanical stirring is done at
Show answer and explanation
Answer: A —
14000 ± 200 rpm
Mechanical Stability Time (MST) test for latex involves high-speed stirring at $14000 \pm 200 \text{ rpm}$ .
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100.
The maximum Ash content in percentage permitted in ISNR - 10 as per BIS speciﬁcation
Show answer and explanation
Answer: C —
0.75
According to BIS specifications, the maximum ash content permitted in ISNR-10 is 0.75%.
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