Explanation

A microscope is designed to magnify tiny, close-up objects that are not visible to the naked eye.

It helps in studying small details of specimens like cells, microorganisms, and other minute structures.

Explanation

A mirage occurs when light bends due to varying air temperatures, causing total internal reflection.

This makes distant objects appear as if they are reflected in water, commonly seen in deserts.

Explanation

Explanation

Acid rain reacts with minerals in stone structures, leading to their decay, which is termed "stone cancer."

It mainly affects limestone and marble, causing surface erosion and weakening of buildings and statues.

Explanation

Number of moons in the planets:

Mercury: 0

Venus: 0

Earth: 1

Mars: 2

Jupiter: 95

Saturn: 146

Uranus: 27

Neptune: 14

Explanation

Chlorine is the gas used to disinfect and purify water.

It is passed through water to kill bacteria.

Explanation

In isometric contraction, muscle length remains the same while tension increases.

No visible movement occurs, as seen in activities like holding a plank or pushing against a wall.

Explanation

• 60-80 is the normal pulse rate of adult.
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• A normal resting heart rate for adults ranges from 60 to 100 beats per minute.
• A normal resting heart rate should be between 60 to 80 beats per minute, but it can vary from minute to minute.
• ***

Explanation

The lifespan of a red blood cell is around 120 days.

Blood cells are made in the bone marrow.

Explanation

Last updated question 25 feb 2026