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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

What are the necessary things required to reduce friction ?

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SOLUTION :We can reduce the FRICTION by using ball barings, lubricants and streamlining the SHAPE of the BODY
Discussion
2.

Which of the following is the biggest source of electricity?

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GENERATOR
WIND mill
Hydel POWER plant
Accumulator

Answer :C
Discussion
3.

Explain the importance of water vapour present in the atmosphere.

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Solution :(i)ESSENTIAL for the growth of PLANTS andanimals.
(ii) Prevents EXCESSIVE vaporization of water from BODY.
(iii) Help in the formation of fog , mist , clouds.
Discussion
4.

The melting point of a solid has the same numerical value as the _____ of the liquid state of the same substance.

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Solution :The melting POINT of a solid has the same numerical VALUE as the freezing point of the liquid STATE of the same substance.
Discussion
5.

Match the following .

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SOLUTION :`(A) to (C) , (B) ,(B) to (b) ,(C) to (d), (D) to (a)`
Discussion
6.

The following two experiments are conducted to prove the release of carbon dioxide and water vapor due to the burning of candle . Between the two experiments which is correct ?Correct ? Givereasons in support of your answer.

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SOLUTION :The products of the combustion of a candle (mixture of hydrocarbons)are`CO_(2)` andwater vapour . `CO_(2)` can be detected by passing it through LIME water which turns milky . `H_(2)O` can be detected by passing it through anhydrous `CuSO_(4)` which turns blue . if the gaseous mixture`(CO_(2)+H_(2)O)`is passed through anhydrous `CuSO_(4)`first , `H_(2)` Is absorbed by `CuSO_(4)` and the left over gas , that is `CO_(2)` turns lime water milky ,But if the gaseous mixture is passed thouogh lime water first , `CO_(2)` GETS absorbed and along with that water , vapour ALSO gets condensed . Hence , anhydrous `CuSO_(4)` does not turn blue . So , experimental set up - B is INCORRECT.
Discussion
7.

Physical exerciesehelp in keeping our bones healthy.

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Solution :Physical exercises, like jogging, brisk walking, cycling and aerobics help in keeping our BONES healthy. Weight bering physical activity helps in the FORMATION of new bone TISSUE and MAKES the bone stronger. Exercises, like SWIMMING and cycling help in building strong muscles. Weight training exercises also increases the bone density.
Discussion
8.

How many Lumens make 37.68 candle power ?

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Solution :1 Lumen =12.56 CANDLE POWER
Number of candle POWERS
`N=(37.68)/(12.56)=3`
Discussion
9.

__________ are the terminals of a battery.

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ANSWER :Electordes
Discussion
10.

How many free surface are there in a gas?

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MANY
Zero
One
Depends on the NATURE of GAS.

Solution :There are 1 surfaces for a gas.
Hence, the CORRECT option is (b).
Discussion
11.

An apparatus used for the purpose of centrifugation is called _______ .

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SOLUTION :An APPARATUS USED for the purpose of centrifugation is CALLED CENTRIFUGE.
Discussion
12.

Give two examples where we use wedges as simple machines.

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SOLUTION :TWO examples where we use wedges as SIMPLE MACHINES are our TEETH and knives.
Discussion
13.

Sodium chloride is a compound is common salt a compound? Justify.

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SOLUTION :Sodium CHLORIDE is a compound of sodium and chlorine. THOUGH sodium chloride is a major component of common salt, it also contains other components, such as potassium chloride, magnesium chloride, CALCIUM chloride which are there in sea water. Commercially available iodized SLAT also contains salts of iodine in addition to these components.
Discussion
14.

Hot tea when poured into a saucer failates easy drinking. Justify.

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Solution :When hot tea is poured from cup into sauccer more number of molecule occupies the surface as the surface area is large. As a result , evaporation takes place FASTER, thereby, COOLING down the tea to moderate temperature. This facilitates EASY drinking.
Discussion
15.

(a) Write the chemical name of the substance taken in the test tube.(b)What is the observation ? Give reasons.( c)The airpresent in the test tube as shown in thediagram is sucked out . why ?

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Solution :(a) Lime WATER that is the solution of CALCIUM hydroxide is taken in the test tube.
(b) Lime water turn slighty turbid due to the carbon dioxide present INAIR.
(C ) The air present in the test tube is SUCKED in order to create low pressure in the test tube. Due to low pressure , air rusher through the lime water.
Discussion
16.

Dipping a bar magnet into a box of iron filings results in a larger number of iron filings stick to the poles or ends than at the center portion because ________.

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Only ends are DIPPED in the box
They are ends of a magnet
They are easier to ATTACH at the EDGES than at the centre.
The STRENGTH of the magnet is more at the poles

Answer :D
Discussion
17.

What is the process, in which antibody comes in contact with antigen and convert them in harmless insoluble matter, called

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SOLUTION :The water vapour PRESENT in air GETS condensed coming in contact with the cool surface . Hence , tiny droplets of water are oberved on the cool surface.
Discussion
18.

Choose the biggest souce of light from the following .

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STAR
Earth
Moon
Glow-worm

Solution :Star
HENCE , the CORRECT OPTION is (a).
Discussion
19.

_____ is the hardest natural material known.

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Solution :Diamond is the HARDEST natural MATERIAL KNOWN.
Discussion
20.

A mixture of sodium chloride and ammonium chloride can be separated by ____ method.

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Solution :A MIXTURE of SODIUM chloride and AMMONIUM chloride can be SEPARATED by sublimation.
Discussion
21.

Pick the odd one out. Elbow, knee, neck, skull.

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SOLUTION :Skull: Skull is MADE up of IMMOVABLE joints, all OTHERS are movable.
Discussion
22.

If MA of a simple machine is greater than 1, then effort arm is _____ than the load arm.

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ANSWER :LONGER
Discussion
23.

Explain with an example how frictional force depends on the area of contact.

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Solution :A sharp knife and blunt knife are used to cut vegetables. Sharp knife applies more PRESSURE on vegetables than blunt knife because as AREA of con tact between TWO SURFACES increase then friction between them also increases.
Discussion
24.

If the angle between the hours hand and minutes hand is around 180^(@) and the hours hand is midway between 12 and 1, then what is the time shown by the clock?

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SOLUTION :This is POSSIBLE only when the hours hand is between 12 and 1, and MINUTES hand is at 6. So, the TIME is 12 hours 30 minutes.
Discussion
25.

Which of the following is a non- magnetic substance ?

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NICKEL
IRON
COBALT
NONE of these

ANSWER :D
Discussion
26.

If the distance covered by a body moving in a circular path of radius (r ) is equal to 2pi r, find its displacement.

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SOLUTION :If a BODY TRAVELS a distance equal to `2pir` in circular PATH, it will reach the same position where it started. So, its displacement is ZERO.
Discussion
27.

Explain the principle involved in centrifugation.

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Solution :Centrifugation involves ROTATION of the solid-liquid mixture at high speed. This rotation creates a centrifugal FORCE which DRAWS the solid particles away from the centre THEREBY resulting in the SETTLING down of the solid particles at the bottom.
Discussion
28.

Abhi, Vasu, Maahi and Lucky are good friends.During summer vacation they met at Vasu's home to play. Vasu's father is good at mathematics and physics, so he used to play with Vasu and his friends by asking subject-related questions in the middle of their play. He asked a question, ''how will you write the weight of you 1 litre water bottle in physics?'' Select the correct form of writing the weight from the answer given by the four.

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Abhi WROTE 10 N
Vasu wrote 10 newtons
MAAHI wrote 10 N
Lucky wrote 10, N.

Solution :Maahi wrote 10 N
Hence, the correct option is (B).
Discussion
29.

Lodestone means _____

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stone which does not attract iron PIECES.
stone which indicates the north-south DIRECTION.
Stone which behaves LIKE a DIAMAGNETIC
Substance which is non-magnetic in nature.

ANSWER :B
Discussion
30.

The electricity meter in the domestic electric circuit measures electrical energy consumption in kilowatt. Hours.

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ANSWER :Kilowatt-hour METER
Discussion
31.

________ do not produce sound when struck.

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SOLUTION :Non-metals do not PRODUCE SOUND when STRUCK.
Discussion
32.

Both theactive component and the inactive component of play important roles . Illusrate.

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Solution :Active COMPONENT is oxygen which is essential for respiration and combustion.
Inactive component is NITROGEN which DILUTES the activity of oxygen and is essential for the GROWTH of plants.
Discussion
33.

Why do snakes move in zigzag manner ?

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SOLUTION :Snakes have no legs but they show fast MOVEMENT in a zigzag manner. The movement is carred out by alternating contraction and RELAXATION of a set of muscles present on the sides of the body creating series of curbves. The wave-like motion PUSHES the body forward by prassing against the ground.
Discussion
34.

What is wind energy . Write its uses .

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Discussion
35.

Arod which is free to move around a point is called_____.

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ANSWER :LEVER
Discussion
36.

Find the ratio of the smallest measurements possible on a screw gauge to verneir calipers.

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Solution :`(S)/(V)=(0.01mm)/(0.01cm) = (1mm)/(1CM) = (1)/(10)`
Discussion
37.

How is the balance of oxygen in atmospheric air maintained ?

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Solution :OXYGEN CONSUMED by living beings during respiration and due to burning of FUELS is CONSTANTLY replenished by plant through the process ofphotosynthesis.
Discussion
38.

Number of bones present in a leg of human being is

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ANSWER :206
Discussion
39.

The tip of the nose is made up of ………….

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ANSWER :CARTILAGE
Discussion
40.

The number of bones in an adult is less than that in an infant.

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Solution :In INFANTS the number of bones is nore. Infants have 300 bones. As the banies grown many small bones fuse togerther to form a single bone. It babies, a few small bones join together and form large bones. Hence, the number of bones GETS reduced CHANGING to 206% by the time ONE reaches adulthod.
Discussion
41.

The connective tissue that connects a ,muscle to a bone is

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ANSWER :TENDON
Discussion
42.

Finer clay particles from water can be separated by the process of

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Sedimentation
Centrifugation
Loading
Distillation.

Solution :Finer CLAY PARTICLES from WATER can be separated by the process of loading Hence, the CORRECT option is (C).
Discussion
43.

Name tge electrical component of the circuit which are labelled as A,B,C,D,E and F.

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SOLUTION :A-Ammeter,B-Cell, C-Closed KEY
D-Rheostat,E-Bulb,F-Voltmeter
Discussion
44.

Which of the following is the correct symbol of fuse ?

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ANSWER :B
Discussion
45.

If an effort of 10 N is applied on a single-fixed pulley to lift a weight of 10 N, then find out its mechanical advantage.

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SOLUTION : MA of a single-fixed PULLEY is ALWAYS 1.
Discussion
46.

Identify the number of noble gases.

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4
6
8
10

Solution :There are 6 noble GASES.
HENCE the correct option is (a).
Discussion
47.

Observe the following figures and draw relevant conchusions regarding the properties of substances represented in the figures

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Solution :(a) Liquids do not have definite shape and they take the shape of the CONTAINER in which they are taken.
(b) Gases OCCUPY the ENTIRE volume of the container.
(c) Water can enter into the number when it is KEPT in a slanting position. Air and water are forms of matter, and HENCE occupy certain space.
Discussion
48.

Gas X is the major component of air . Amongthe following identify the true statement regarding X .

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X is used as a FIRE extinguisher.
X is essential for rusting.
X ISHIGHLY SOLUBLE in water.
Xis a very unreactive GAS.

Solution :Gas X isnitrogen . X is very unreactive gas.
Discussion
49.

A toy car ( made of soft iron ) and two bar magnets are arranged as shown in the figure. What would happen if the magnet 'A' is moved towards the car as shown in the figure. ?

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The carwill not have any IMPACT due to the MOTION of the magnet .
The car moves away from magnet A.
The car moves towards magnet A.
The car moves till it is EXACTLY mid-way between the two magnets.

Solution :SINCE the front part of the toy car is in contact with the south pole of a magnet B, its rear part acts as the south pole. As magnet A moves towards the rear part of the car, it should move away from magnet A due to magnetic repulsion.
Hence , the correct option is (b).
Discussion
50.

Name a machine which can be used to : change the direction of force applied.

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Inclined plane
Single-FIXED pulley
Scissors
Screw jack

Solution : Single fixed pulley is used to REVERSE the direction of APPLICATION of FORCE.
Discussion