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Question 1983

The rusting of the iron is the example of:

AOxidation

BReduction

CPolymerisation

DGalvanization

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A. OxidationExplanation: The rusting of iron is an example of oxidation. When iron reacts with oxygen and moisture from the air, it forms hydrated ferric oxide (Fe₂O₃·xH₂O), commonly known as rust. This process involves the loss of electrons by iron, which is a characteristic feature of oxidation.

Question 1982

An F1 car is mostly made up of which material ?

APlastic

BCarbon fibre

CSteel

DAluminium

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B. Carbon fibreExplanation: An F1 (Formula One) car is primarily made of carbon fibre, a lightweight yet extremely strong and durable material. Carbon fibre provides high strength-to-weight ratio, excellent rigidity, and improved safety — essential for achieving high speeds and ensuring driver protection in racing conditions.

Question 1981

Through the fused sodium chloride, electric current can pass out due to the presence of:

AFree electron

BFree ion

CFree molecule

DNone of these

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B. Free ionExplanation: In fused (molten) sodium chloride, electric current passes due to the presence of free ions. When solid NaCl is melted, it dissociates into Na⁺ and Cl⁻ ions, which can move freely and conduct electricity. In the solid state, these ions are fixed in the crystal lattice, so it does not conduct electricity.

Question 1980

Which one among the following is strong smelling agent used in LPG cylinder to help in the detection of gas leakage?

AEthanol

BThioethanolanine

CMethane

DChloroform

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B. ThioethanolanineExplanation: A strong-smelling compound called thioethanolamine (or ethyl mercaptan) is added to LPG (liquefied petroleum gas) to help detect gas leaks. LPG itself is odourless, so this compound gives it a distinct unpleasant smell, making leakage easily noticeable for safety.

Question 1979

The mountaineers carry oxygen with them because:

Aat an altitude of more than 5 km there is no air

Bthe amount of air available to a person onmountain is lesser than that available on the ground

Cthe temperature of air is lesser than that onthe ground.

DThe pressure of air is higher than that on theground.

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B. the amount of air available to a person onmountain is lesser than that available on the groundMountaineers carry oxygen cylinders because the amount of air (and oxygen) available at high altitudes is much less than that at ground level. As altitude increases, air pressure and oxygen concentration decrease, making breathing difficult and leading to altitude sickness. Supplemental oxygen helps them breathe properly and maintain body function. No air above 5 km: Incorrect — air exists but is thinner.Lower temperature: True but not the reason for carrying oxygen.Higher air pressure: Incorrect — pressure decreases with height.

Question 1978

Which of the following is an example of static electricity ?

AGlass rod rubbed with silk cloth

BEbonite rod rubbed with wool

CLightening in the sky

DAll of the above

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D. All of the aboveAll of the above are examples of static electricity. Static electricity is the result of the accumulation of electric charges on the surface of objects. When materials like glass, silk, ebonite, or wool are rubbed together, electrons are transferred, creating a charge imbalance. Similarly, lightning is a large-scale natural discharge of static electricity between clouds and the Earth. Glass rod & silk cloth: Positive and negative charges develop.Ebonite rod & wool: Negative charge accumulates on ebonite.Lightning: Discharge of atmospheric static electricity.

Question 1977

Sound-waves from a loud speaker is caused by:

Afrequency

Bvibrations

Cpitch

Damplitude

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B. vibrationsSound waves from a loudspeaker are produced by vibrations of its diaphragm. When an electric current passes through the speaker coil, it causes the diaphragm to move back and forth, creating compressions and rarefactions in the air. These pressure variations travel as sound waves to our ears. Frequency: Determines pitch but does not create sound.Pitch: A property of sound, not its cause.Amplitude: Determines loudness but not the origin of sound.

Question 1976

Magnetic effect of current gives rise to which force ?

Amechanical

Bfrictional

Cspring

Dgravitational

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A. mechanicalThe magnetic effect of current gives rise to a mechanical force. When an electric current passes through a conductor placed in a magnetic field, it experiences a force that can cause motion — this is known as the motor effect. This principle is used in devices like electric motors, galvanometers, and loudspeakers. Frictional force: Arises due to contact between surfaces.Spring force: Related to elasticity.Gravitational force: Due to attraction between masses, unrelated to current.

Question 1975

Quality of petrol is expressed in:

AGold number

BCetane number

CMethane number

DOctane number

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D. Octane numberExplanation: The quality of petrol (gasoline) is measured by its octane number, which indicates the fuel's resistance to knocking (premature ignition) in an internal combustion engine; a higher octane number gives better performance and smoother operation.

Question 1974

What is the rarest blood type in the world ?

BO positive

CAB _

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C. AB _Explanation: The rarest blood type in the world is AB⁻ (AB negative). It is found in less than 1% of the global population. People with AB⁻ blood can receive red blood cells from all Rh-negative blood types, but they can donate only to other AB individuals.

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Explore the question bank

The rusting of the iron is the example of:

An F1 car is mostly made up of which material ?

Through the fused sodium chloride, electric current can pass out due to the presence of:

Which one among the following is strong smelling agent used in LPG cylinder to help in the detection of gas leakage?

The mountaineers carry oxygen with them because:

Which of the following is an example of static electricity ?

Sound-waves from a loud speaker is caused by:

Magnetic effect of current gives rise to which force ?

Quality of petrol is expressed in:

What is the rarest blood type in the world ?

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