Explanation

• Natural gas is widely used as a domestic fuel because it is easy to use and burns cleanly.
• It produces less smoke and fewer harmful gases compared to coal and other fuels.
• It is supplied through pipelines, making it convenient for households.
• It is considered a cleaner fossil fuel.

Last verified on 13-05-2026

Explanation

• Solar energy is obtained directly from sunlight using solar panels.
• It is a renewable and inexhaustible source of energy.
• It can be used for electricity, heating, and many daily applications.

Last verified on 13-05-2026

Explanation

• Cytoplasm is the living, jelly-like material inside the cell.
• All cell organelles are embedded within it.
• It helps in transport of materials and supports cellular activities.
• It is essential for the proper functioning of the cell.

Last verified on 13-05-2026

Explanation

• Carbohydrates are the main energy-giving nutrients in an ordinary diet.
• They are broken down into glucose, which provides energy to the body.
• They are the fastest and most efficient source of energy.
• Common foods rich in carbohydrates include rice, bread, and potatoes.

Last verified on 13-05-2026

Explanation

• Laser light is highly concentrated in a very narrow beam.
• This allows it to deliver a large amount of energy to a very small area.
• It does not spread out like normal light.
• This property makes lasers useful in medicine, industry, and communication.

Last verified on 13-05-2026

Explanation

• The output unit of a computer presents processed data to the user.
• It converts machine results into human-readable form.
• It can be visual, audio, or printed form.
• Common output devices include monitor and printer.

Last verified on 13-05-2026

Explanation

• Atoms that have the same number of neutrons but different atomic numbers are called isotones.
• They belong to different elements because their proton numbers are different.

Additional information:

• The word “isotone” comes from Greek meaning “equal tension.”
• Isotopes belong to the same element, while isotones belong to different elements.

Last verified on 13-05-2026

Explanation

• Alpha radiation has the lowest penetrating power.
• It can be stopped easily by paper or even human skin.
• Alpha particles are heavy and carry a positive charge.

Additional information:

• Gamma rays have the highest penetrating power.

Last verified on 13-05-2026

Explanation

• An atom is electrically neutral when positive and negative charges are equal.
• Protons carry positive charge, while electrons carry negative charge.
• If both are equal in number, the total charge becomes zero.

Additional information:

• The nucleus contains protons and neutrons.
• Electrons move around the nucleus in energy shells.

Last verified on 13-05-2026

Explanation

• Wind energy is produced by moving air (wind).
• The amount of electricity generated depends on wind speed and air movement.
• It is a renewable and environmentally friendly energy source.

Last verified 13-05-2026