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Question 3625

"Athlete's foot" is:

Aa specific footwear for athletes to prevent them from straining their feet

Ban allergic skin rash

Ca common fungal infection that attacks the skin below the toes

Dan eczema

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C. a common fungal infection that attacks the skin below the toesExplanation: Athlete’s foot, scientifically known as Tinea pedis, is a fungal infection caused mainly by dermatophytes such as Trichophyton species. It thrives in warm, moist areas like the skin between the toes. Symptoms include itching, scaling, redness, and sometimes blistering. It spreads easily in communal areas like locker rooms and swimming pools. Proper hygiene and antifungal treatment can prevent and cure the infection.

Question 3624

Which one is a water soluble vitamin?

AVitamin A

BVitamin C

CVitamin K

DVitamin D

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B. Vitamin CExplanation: Vitamins are classified into two categories based on their solubility — fat-soluble and water-soluble. Vitamin C (ascorbic acid) and the B-complex vitamins are water-soluble, meaning they dissolve in water and are not stored in the body. Therefore, they must be consumed regularly through diet. Deficiency of Vitamin C causes scurvy, characterized by bleeding gums and delayed wound healing.

Question 3623

What makes a lemon sour?

ATartaric acid

BOxalic acid

CCitric acid

DHydrochloric acid

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C. Citric acidExplanation: The sour taste of a lemon is due to the presence of citric acid. Citric acid is a weak organic acid found naturally in citrus fruits such as lemons, oranges, and limes. It gives them their characteristic tangy flavor and also acts as a natural preservative.

Question 3622

The weight of a body at the centre of the earth is:

Azero

Binfinite

Csame as at other places

Dnone of these

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A. zeroExplanation: The weight of a body at the centre of the Earth is zero because the gravitational forces from all directions cancel each other out. Although the body still has mass, it experiences no gravitational pull, resulting in zero weight.

Question 3621

The acid present in the stomach of human beings is:

AHNO3

BH2CO3

CHCl

DH2SO4

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C. HClExplanation: The acid present in the human stomach is hydrochloric acid (HCl). It helps in the digestion of food by breaking down proteins and activating the enzyme pepsin. HCl also kills harmful microorganisms present in the food, aiding in maintaining a healthy digestive system.

Question 3620

Organic farming does not include:

Agreen manures

Bchemical fertilizers

Ccrop rotation

Dcompost and farmyard manures

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B. chemical fertilizersExplanation: Organic farming is an agricultural method that emphasizes the use of natural inputs and eco-friendly techniques. It avoids chemical fertilizers, pesticides, and genetically modified organisms (GMOs). Instead, it uses organic manures (compost, green manure, and farmyard manure), crop rotation, and biological pest control to maintain soil health and productivity. Chemical fertilizers are excluded because they degrade soil quality and harm beneficial soil organisms over time.

Question 3619

The stars twinkle at night because:

Athey emit energy

Bof diffraction

Cof refraction

Dof reflection

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C. of refractionExplanation: Stars appear to twinkle at night due to the refraction of light by the Earth's atmosphere. As starlight passes through different layers of air with varying densities, its path bends continuously, causing the light’s intensity and position to appear to change, creating the twinkling effect.

Question 3618

An alternating current instead of direct current is used in long-distance electric transmission because:

Ait is easy to generate

Brectification is possible

Cenergy losses are minimum

Dit causes fewer accidents

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C. energy losses are minimumExplanation: Alternating current (AC) is used for long-distance transmission because energy losses are minimal. The voltage of AC can be easily increased or decreased using transformers, allowing transmission at high voltage and low current, which reduces power loss due to resistance in the wires.

Question 3617

Which one of the following solutions will not turn blue litmus to red litmus?

ALemon juice

BAcetic acid

CSodium hydroxide

DHydrochloric acid

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C. Sodium hydroxideExplanation: Sodium hydroxide (NaOH) is a base, so it does not turn blue litmus paper red. Instead, it turns red litmus paper blue. In contrast, lemon juice, acetic acid, and hydrochloric acid are acidic and turn blue litmus red.

Question 3616

CNG stands for:

ACompressed Natural Gasoline

BCompressed Natural Gas

CCompressed Nitrogen Gas

DCompressed Neon Gas

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B. Compressed Natural GasExplanation: CNG stands for Compressed Natural Gas. It is an eco-friendly fuel made primarily of methane (CH₄) and is used as an alternative to petrol and diesel. CNG burns cleanly, producing fewer pollutants and helping reduce air pollution.

Preparing your study space

Science

"Athlete's foot" is:

Which one is a water soluble vitamin?

What makes a lemon sour?

The weight of a body at the centre of the earth is:

The acid present in the stomach of human beings is:

Organic farming does not include:

The stars twinkle at night because:

An alternating current instead of direct current is used in long-distance electric transmission because:

Which one of the following solutions will not turn blue litmus to red litmus?

CNG stands for:

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