Explanation

• Brazing and welding are hot working processes.
• Because they involve the use of heat to join metals.
• In welding, metals are melted and joined together using heat.
• In brazing, a filler metal is melted to join two metal pieces without melting the base metals.

Last verified on 16-06-2026

Explanation

• Black colour cloth absorbs more sunlight than other colours.
• Black absorbs almost all light and converts it into heat.

Additional information:

• White colour reflects most sunlight and stays cooler.

Last verified on 16-06-2026

Explanation

• Lamp is not a form of energy.
• It is a device that produces light.
• Heat, sound, and light are all different forms of energy.
• Energy is the ability to do work or produce change.
• A lamp converts electrical energy into light energy.

Last verified on 16-06-2026

Explanation

• The teaspoon becomes hot due to conduction of heat.
• Heat transfers from the hot liquid to the metal spoon through direct contact.
• Metals are good conductors of heat, so they heat up quickly.
• This process does not involve movement of particles.

Last verified on 16-06-2026

Explanation

• Base Quantity: Length
• SI Unit: meter (m)
• Type: Fundamental quantity
• System: International System of Units (SI)

Additional information:

Base Quantities in SI System:

• Mass (kilogram)
• Time (second)
• Electric current (ampere)
• Temperature (kelvin)

Last verified on 16-06-2026