Electricity

Study the circuit diagram.

Which bulb, if faulty, would allow only one other bulb to light up in the circuit.

• W

• X

• Y

• Z

The diagram below shows five lamps connected to two batteries.

When one of the lamps is not working, only two light bulbs remain lighted.

Which lamp is NOT working?

• A

• B

• C

• D

Study the circuit below.

Which of the bulbs, B and C, will remain lit when bulb A blows?

• B only

• C only

• B and C

• none

Siva wanted to find out whether liquid X is a conductor of electricity. The diagram below shows some of the apparatus found in the Science Room.

Which one of the following shows the most suitable set-up for Siva’s experiment?

• 
• 
• 
• 

Mary set up the circuit shown below. At first, the identical bulbs, A, B, C and D, lit up to the same level of brightness.

She then removed bulb E from the bulb holder and battery Y from the battery holder. What would happen to bulbs A, B, C and D?

• Bulbs A, B, C and D are dimmer than before.

• Bulbs A and B are dimmer than bulbs C and D.

• Bulbs A and B are brighter than bulbs C and D.

• Bulbs A, B, C and D do not light up.

Study the four circuits A, B, C and D shown below.

The bulbs and the batteries in the four circuits are identical. All the bulbs are lit up.

Which one of the following statements about the brightness of the bulbs is correct?

• The bulb in circuit A is as bright as the bulb in circuit C.

• The bulb in circuit A is as bright as each bulb in circuit D.

• Each bulb in circuit B is brighter than the bulb in circuit C.

• Each bulb in circuit B is brighter than each bulb in circuit D.

Study the circuit below. Bulbs A and B are identical and the three batteries are identical. At first, bulb A is unlit while bulb B is lit with a brightness of 10 units.

If the button is pressed and held down, what would happen to bulbs A and B?

• Bulb A - as bright as 10 units

  Bulb B - unlit

• Bulb A - brighter than 10 units

  Bulb B - unlit

• Bulb A - as bright as 10 units

  Bulb B - brighter than 10 units

• Bulb A - brighter than 10 units

  Bulb B - brighter than 10 units

In the circuit below, the bulbs and batteries are all working properly.

Which of the following switches should be closed so that only one bulb will light up?

• S1 and S4 only

• S2 and S4 only

• S1 and S3 only

• S2 and S3 only

Gopal set up four electrical circuits P, Q, R and S using identical batteries and identical bulbs. The batteries and bulbs are all working properly.

Which of the following is correct?

• Circuit(s) with brightly lit bulb(s) - Q

  Circuit(s) with dimly lit bulb(s) - P, R and S

• Circuit(s) with brightly lit bulb(s) - Q and S

  Circuit(s) with dimly lit bulb(s) - P and R

• Circuit(s) with brightly lit bulb(s) - R and S

  Circuit(s) with dimly lit bulb(s) - P and Q

• Circuit(s) with brightly lit bulb(s) - P, Q and R

  Circuit(s) with dimly lit bulb(s) - S

Each of the circuits below has an iron rod, a wooden rod and a plastic rod.

In which of the above circuits would the bulb light up?

• A only

• B only

• Both A and B

• None of the circuits