Explanation

A generator works on Faraday’s Law of Electromagnetic Induction, producing electricity when a conductor moves in a magnetic field.

It converts mechanical energy into electrical energy using electromagnetic induction.

Explanation

In a single displacement reaction, one element replaces another in a compound.

Here, C replaces B in the compound AB, forming A + BC.

Explanation

High-frequency radio waves from mobile phones may affect the brain’s electrical activity, leading to sleep disturbances and increased stress levels.

Studies have linked prolonged exposure to electromagnetic radiation with potential risks like headaches, anxiety, and reduced sleep quality.

Explanation

Al-Hawi by Muhammad bin Zakriya Al-Razi is a comprehensive medical encyclopedia.

It compiled significant medical knowledge from both Greek and Arab sources.

Explanation

When a grain of sand enters an oyster's body, the oyster secretes layers of nacre (mother of pearl) around the irritant.

Over time, these layers build up and form a pearl.

Explanation

CaCO₃ → CaO + CO₂ is an endothermic reaction because it absorbs heat to decompose calcium carbonate.

Exothermic reactions (like combustion reactions) release heat to the surroundings.

Explanation

Hepatitis A and E are typically acute, short-term infections that resolve on their own without causing chronic liver disease.

Hepatitis B and C, on the other hand, can lead to chronic infections.

Explanation

Number of neutrons = Atomic mass - Atomic number

= 27 - 13 = 14

Atomic number (13) gives the number of protons, and subtracting it from the atomic mass gives the neutrons.

Explanation

Radiation transfers heat through electromagnetic waves and does not require a medium.

For example, the Sun's heat reaches Earth through radiation.

Explanation

Photosynthesis occurs in the mesophyll tissues of leaves, where chloroplasts are present.

Other options are incorrect because:

Leaves are organs, not just cells.

Oesophagus is part of the digestive system, not respiratory.

Trachea belongs to the respiratory system, not digestive.