S2 Science Chapter 8

Multiple Choice

What is the unit of current?

• W

• V

• A

• J

Multiple Choice

What is the main voltage in HK

• 110V

• 120V

• 220V

• 240V

Multiple Choice

When resistance of a circuit increase, how is the current change

• decrease

• increase

• unchange

Multiple Choice

Which pin is longest in the socket?

• Same length

• earth

• live

• neutral

Multiple Choice

What is the correct current relation in series circuit

• A1=A2=A3

• A1=A2+A3

• A1=A2xA3

• A1=A2/A3

Multiple Choice

What is the correct voltage relation in parallel circuit

• V1=V2=V3

• V1=V2+V3

• V1=V2xV3

• V1=V2/V3

Multiple Choice

Which fuse is suitable for a cooker of 3A

• 1A

• 3A

• 5A

• 13A

Multiple Choice

Which wire can get electric shock when we touch

• neutral

• earth

• live

• all wires

Multiple Choice

Which environment may cause short circuit?

• dry and clean

• dry with dust

• wet and clean

• wet with dust

Multiple Choice

What is the voltage for four 1.5V cells connected in same direction

• 0V

• 1.5V

• 4.5V

• 6V

Multiple Choice

What is the voltage for four 1.5V cells connected in parallel

• 0V

• 1.5V

• 4.5V

• 6V

Multiple Choice

What is the colour of neutral wire

• brown

• blue

• yellow

• green

Multiple Choice

What is the colour of earth wire

• greenish yellow

• yellow green

• green and yellow

• green

Multiple Choice

What is the use of earth wire?

• save energy

• protect appliances

• prevent fire

• prevent electric shock

Multiple Choice

Which device can measure voltage

• ammeter

• resistor

• switch

• voltmeter

Multiple Choice

What one have the same function as fuse

• circuit breaker

• switch

• resistor

• voltmeter

Multiple Choice

What is the approximate current use for a portable fan?

• 0.05A

• 1A

• 15A

• 1000A

Multiple Choice

What is the use of connecting wires?

• supply energy

• consume energy

• Provide path

• transfer energy