physics

• Physics
• Lower Secondary (Key Stage 3)

physics

What is an insulator?

1. A material that does not conduct electricity
2. A type of wire
3. A material that conducts electricity
4. A device used in electrical circuits

Which of the following materials is a good insulator?

1. Rubber
2. Aluminum
3. Copper
4. Silver

What is the primary purpose of an insulator in electrical systems?

1. To prevent the flow of electricity and protect against electric shocks
2. To generate electricity
3. To enhance the flow of electricity
4. To store electricity

Which of the following is not an example of an insulator?

1. Glass
2. Plastic
3. Copper
4. Wood

Why are insulators important in power transmission lines?

1. They generate electricity
2. They prevent the loss of electrical energy through leakage
3. They reduce the voltage in the lines
4. They increase the conductivity of the wires

What is thermal conductivity?

1. The ability of a material to conduct heat
2. The ability of a material to absorb sound
3. The ability of a material to reflect light
4. The ability of a material to conduct electricity

Which of the following materials has the highest thermal conductivity?

1. Glass
2. Copper
3. Rubber
4. Wood

Which unit is used to measure thermal conductivity?

1. Kilograms
2. Meters
3. W/mK (Watts per meter Kelvin)
4. Celsius

Which material has low thermal conductivity and is often used as an insulator?

1. Aluminum
2. Copper
3. Fiberglass
4. Steel

True or False: Thermal conductivity increases with temperature.

1. False
2. True

What is double glazing?

1. A type of window with four panes of glass
2. A type of window with three panes of glass
3. A type of window with two panes of glass
4. A type of window with one pane of glass

What is the purpose of double glazing?

1. To promote air circulation
2. To increase noise pollution
3. To improve energy efficiency and reduce heat loss
4. To enhance visual aesthetics

What material is commonly used for the frames of double glazed windows?

1. Aluminum
2. Wood
3. uPVC (Unplasticized Polyvinyl Chloride)
4. Steel

Which of the following is not a benefit of double glazing?

1. Reduced condensation
2. Increased vulnerability to break-ins
3. Improved sound insulation
4. Enhanced security

What is the recommended minimum gap between the two panes of glass in double glazing?

1. 8mm
2. 20mm
3. 12mm
4. 16mm

What is the process by which heat is transferred through direct contact?

1. Convection
2. Conduction
3. Radiation
4. Evaporation

Which type of heat transfer occurs due to the movement of fluids?

1. Conduction
2. Radiation
3. Condensation
4. Convection

What is the transfer of heat through electromagnetic waves called?

1. Radiation
2. Conduction
3. Sublimation
4. Convection

Which type of heat transfer involves the phase change of a substance?

1. Latent heat transfer
2. Adiabatic heat transfer
3. Heat of fusion
4. Sensible heat transfer

What is the unit of measurement for heat transfer?

1. Pascal
2. Kelvin
3. Watt
4. Joule