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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.

Show answer

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

Show answer

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 _

Show answer

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.

Question 1973

Which of the following is not a biofertilizer ?

ARhizobium

BMucor

CAzotobacter

DAnabaena

Show answer

B. MucorExplanation: Mucor is not a biofertilizer; it is a saprophytic fungus that grows on decaying organic matter. Biofertilizers are living microorganisms that enhance soil fertility by fixing atmospheric nitrogen or solubilizing nutrients. Examples include Rhizobium, Azotobacter, and Anabaena.

Question 1972

Opium is derived from which part of poppy plant ?

ASeeds

BLeaves

CBark

DCapsule

Show answer

D. CapsuleExplanation: Opium is obtained from the latex present in the unripe capsule of the poppy plant (Papaver somniferum). The latex is collected by making incisions on the capsule, and after drying, it forms raw opium, which contains alkaloids like morphine and codeine.

Question 1971

Which of the following is not a viral disease ?

ATuberculosis

BPolio

CSwine flu

DHepatitis

Show answer

A. TuberculosisExplanation: Tuberculosis (TB) is not a viral disease; it is caused by a bacterium called Mycobacterium tuberculosis. In contrast, Polio, Swine flu, and Hepatitis are viral diseases caused by different types of viruses.

Question 1970

Which of the following cells produce immune response in human body ?

ARed blood cells

BWhite blood cells

CEpithelical cells

DAdipose cells

Show answer

B. White blood cellsExplanation: White blood cells (WBCs), also known as leukocytes, are responsible for producing the immune response in the human body. They defend against infections by attacking bacteria, viruses, and other foreign invaders, helping to maintain the body’s immunity.

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Science

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 ?

Which of the following is not a biofertilizer ?

Opium is derived from which part of poppy plant ?

Which of the following is not a viral disease ?

Which of the following cells produce immune response in human body ?

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