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Question 1989

The HIV virus affects the:

ALeucocytes

BLymphocytes

CErythrocytes

DNone of these

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B. LymphocytesExplanation: The HIV (Human Immunodeficiency Virus) primarily attacks the lymphocytes, especially the CD4⁺ T-helper cells of the immune system. This weakens the body’s defense mechanism, making it vulnerable to various infections and diseases, eventually leading to AIDS (Acquired Immunodeficiency Syndrome).

Question 1988

Liquid natural gas (LNG) predominantly contains _______ in liquid form.

AEthane

BEthylene

CMethane

DMethylene

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C. MethaneExplanation: Liquid Natural Gas (LNG) predominantly contains methane (CH₄) in liquid form. It is produced by cooling natural gas to about −162°C, which reduces its volume for easier storage and transportation. LNG is a clean fuel with high energy efficiency and low emissions.

Question 1987

What is reason for using red light as a stop signal ?

ALong wavelength

BShort wavelength

CChromogenic effect

DInfra Red

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A. Long wavelengthExplanation: Red light is used as a stop signal because it has the longest wavelength among visible colors, allowing it to scatter the least and remain visible from a greater distance, even in fog, rain, or dust. This ensures better visibility and safety on roads.

Question 1986

Which of the following is not correctly matched ?

ABecquerel : Radioactivity

BAlexander Flaming : Penicillin

CLouis Pasteur : Blood groups

DWilliam Harvey : Blood circulation

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C. Louis Pasteur : Blood groupsExplanation: The pairing Louis Pasteur : Blood groups is not correctly matched. Louis Pasteur is known for his work on pasteurization and germ theory of disease, not for discovering blood groups. The discovery of blood groups was made by Karl Landsteiner in 1900. Other matches are correct.

Question 1985

All ships have sonar system. It is used to detect /measure :

ADistance of the shore

BSound on the surface

CSound of animals in Sea

DDepth of ocean

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D. Depth of oceanExplanation: SONAR (Sound Navigation and Ranging) is a system used in ships and submarines to determine the depth of the ocean or to locate underwater objects. It works by sending sound waves into the water and measuring the time taken for the echo to return after reflecting from the seabed or any object.

Question 1984

Which of the following is not correct ? (a) Exercise does not help in managing psychological discomfort. (b) Exercise increases cardio-respiratory fitness. (c) Exercise reduces risk of diabetes. (d) Exercise helps in managing bone health.

AExercise does not help in managingpsychological discomfort.

BExercise increases cardio-respiratory fitness.

CExercise reduces risk of diabetes.

DExercise helps in managing bone health.

Show answer

A. Exercise does not help in managingpsychological discomfort.Explanation: The statement “Exercise does not help in managing psychological discomfort” is incorrect. Regular physical exercise helps reduce stress, anxiety, and depression by releasing endorphins — the body’s natural mood enhancers. It also improves overall mental health, cardio-respiratory fitness, reduces the risk of diabetes, and strengthens bones.

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

Show answer

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.

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Science

The HIV virus affects the:

Liquid natural gas (LNG) predominantly contains _______ in liquid form.

What is reason for using red light as a stop signal ?

Which of the following is not correctly matched ?

All ships have sonar system. It is used to detect /measure :

Which of the following is not correct ? (a) Exercise does not help in managing psychological discomfort. (b) Exercise increases cardio-respiratory fitness. (c) Exercise reduces risk of diabetes. (d) Exercise helps in managing bone health.

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?

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