Electricity & Its Effects Quiz

A student wraps a wire around a wooden stick and connects it to a battery. What will most likely happen?

1. The wire will conduct electricity through the wooden stick.
2. The wood will conduct electricity to the battery.
3. The current will flow only through the wire, not the wood.
4. The wooden stick will heat up due to electricity.

Answer: (b) The wood will conduct electricity to the battery.

When a switch in an electric circuit is turned off, what happens to the current in the circuit?

1. The current increases gradually until it reaches a constant level.
2. The current instantly stops flowing in the circuit.
3. The current slows down but continues to flow at a reduced rate.
4. The current flows backward through the circuit

Answer: (b) The current instantly stops flowing in the circuit.

What would happen to the brightness of a bulb in a parallel circuit if another identical bulb is added in parallel?

1. The brightness of both bulbs will increase
2. The brightness of both bulbs will decrease
3. The brightness of both bulbs will remain the same
4. The brightness of the first bulb will increase while the second bulb dims

Answer: (c) The brightness of both bulbs will remain the same

A steel rod is used in place of the iron bar in the experiment. When the circuit is closed, the steel rod attracts iron filings. Which of the following statements is correct?

1. The steel rod remains magnetized even after the switch is turned off.
2. The steel rod becomes demagnetized immediately after the switch is turned off.
3. The steel rod shows stronger magnetism than the iron bar while the current flows.
4. The steel rod repels the iron filings as it becomes electrically charged.

Answer: (a) The steel rod remains magnetized even after the switch is turned off.

In which of the following cases would you observe electroplating? A. A plastic spoon is connected to a copper electrode in a copper sulphate solution. B. An iron spoon is connected to a copper electrode in a copper sulphate solution. C. A wooden stick is dipped in copper sulphate without any current. D. A glass rod is connected to a battery and dipped in copper sulphate solution.

1. Only B
2. Only C
3. Both B and C
4. Both C and D

Answer: (a) Only B

A student tests four liquids with a bulb circuit. The following results are obtained: Which of the following is the most reasonable conclusion based on the observations? Liquid Bulb Glows (Yes/No) Gas Bubbles Form (Yes/No) Lemon juice Yes Yes Saltwater Yes Yes Distilled water No No Oil No No

1. All liquids with dissolved substances conduct electricity
2. Liquids containing ions conduct electricity and form gas bubbles
3. Liquids without gas bubbles are non-conductive
4. Only acidic liquids conduct electricity

Answer: (b) Liquids containing ions conduct electricity and form gas bubbles

Lina built an electrical circuit using wires, three batteries, three bulbs, a switch, a piece of cardboard, and a metal paper clip. When she turned on the switch, none of the bulbs lit up. Which of the following could represent the circuit Lina constructed?

Answer: (d)

The table below shows the electrolytes used in different electroplating processes: Why is aluminium oxide used in molten form rather than as a solution? A. Aluminium reacts with water. B. Aluminium oxide does not dissolve in water. C. Aluminium is more reactive than water. D. Aluminium cannot be plated using electricity. Metal to Be Plated Electrolyte Used Nature of Electrolyte Silver Silver nitrate solution Ionic compound Copper Copper sulfate solution Ionic compound Nickel Nickel chloride solution Ionic compound Aluminium Molten aluminium oxide Covalent compound

1. Only A
2. Only B
3. Only A and B
4. Only C and D

Answer: (b) Only B

Harry sets up four circuits using identical batteries and bulbs in working condition. In which circuits will bulb T have the same brightness?

1. A and B only
2. B and D only
3. C and D only
4. A, B and C only

Answer: (d) A, B and C only

Gabrielle sets up an electric circuit as shown below. She uses identical batteries, switches and bulbs. She wants to switch on the hair dryer only. Which switches should she close?

1. S1 and S5 only
2. S1, S2 and S3 only
3. S1, S2 and S4 only
4. S2, S3 and S5 only

Answer: (c) S1, S2 and S4 only