GROUP 1
1. Which component provides electrical energy in a simple circuit?
A. Bulb
B. Cell
C. Switch
D. Wire
B. Cell
1. A bulb glows only when the circuit is
A. open
B. broken
C. complete
D. disconnected
C. complete
1. Which device is used to open or close a circuit?
A. Cell
B. Switch
C. Bulb
D. Filament
B. Switch
1. Which of the following is a conductor of electricity?
A. Rubber
B. Plastic
C. Copper
D. Wood
C. Copper
1. Which of the following is an insulator?
A. Iron
B. Copper
C. Aluminium
D. Plastic
D. Plastic
2. A bulb connected to a cell does not glow. Which is the most likely reason?
A. The circuit is incomplete
B. The wire is made of copper
C. The switch is closed
D. The bulb is receiving too much current
A. The circuit is incomplete
2. Why are electric wires covered with plastic?
A. To increase current flow
B. To make them colourful
C. To prevent electric shocks
D. To make them heavier
C. To prevent electric shocks
2. Which object is most suitable for completing a circuit?
A. Rubber band
B. Wooden stick
C. Iron nail
D. Plastic scale
C. Iron nail
2. In a torch, the bulb converts electrical energy mainly into
A. sound energy
B. light energy
C. chemical energy
D. magnetic energy
B. light energy
2. A student inserts a metal key into a gap in a circuit and the bulb glows. This shows that the key is
A. an insulator
B. transparent
C. a conductor
D. non-metallic
C. a conductor
3. A bulb connected with only one wire to a cell will not glow because
A. the bulb is defective
B. one wire is enough
C. the circuit is incomplete
D. the cell has no energy
C. the circuit is incomplete
3. Which of the following materials is least likely to allow a bulb to glow?
A. Coin
B. Aluminium foil
C. Steel spoon
D. Eraser
D. Eraser
3. A torch stops working suddenly. Which should be checked first?
A. Colour of the torch
B. Completeness of the circuit
C. Length of the wire
D. Shape of the bulb
B. Completeness of the circuit
3. Why are copper wires preferred in electrical circuits?
A. Copper is magnetic
B. Copper is transparent
C. Copper conducts electricity well
D. Copper is an insulator
C. Copper conducts electricity well
3. Which statement about an electric switch is correct?
A. It stores electricity.
B. It controls the flow of current.
C. It produces electricity.
D. It converts electricity into light.
B. It controls the flow of current
4. A bulb glows when a coin is inserted into a gap in the circuit but does not glow when paper is inserted. What does this indicate?
A. Paper is a conductor
B. Coin and paper are both conductors
C. Coin is a conductor and paper is an insulator
D. Coin is an insulator
C. Coin is a conductor and paper is an insulator
4. Which arrangement will definitely make a bulb glow?
A. Cell + bulb + one wire
B. Cell + bulb + conducting path forming a complete circuit
C. Bulb + switch
D. Cell only
B. Cell + bulb + conducting path forming a complete circuit
4. A bulb does not glow even though the circuit is complete. What could be a possible reason?
A. The bulb filament is broken
B. The wire is metallic
C. The switch is ON
D. The cell is connected
A. The bulb filament is broken
4. Why should the terminals of a cell be connected properly in a circuit?
A. To complete the path for current
B. To change the colour of the bulb
C. To reduce the size of the circuit
D. To make the wires longer
A. To complete the path for current
4. Which property makes rubber useful in electrical wiring?
A. It conducts electricity
B. It allows current to pass easily
C. It prevents the flow of electricity
D. It produces electricity
C. It prevents the flow of electricity
5. A student finds that a bulb glows with an iron key but not with a wooden ruler. What can be concluded?
A. All solids conduct electricity
B. Wood conducts better than iron
C. Different materials have different conducting properties
D. Iron is an insulator
C. Different materials have different conducting properties
5. Which of the following would make a circuit useless even if all other components are working?
A. A broken wire
B. A copper wire
C. A closed switch
D. A fresh cell
A. A broken wire
5. Why is it unsafe to touch bare electric wires?
A. They are too light
B. They may allow current to pass through our body
C. They change colour
D. They stop conducting electricity
B. They may allow current to pass through our body
5. A student tests several materials in a circuit. Which observation best helps identify a conductor?
A. The material is shiny
B. The material is hard
C. The bulb glows when the material is inserted in the circuit
D. The material floats in water
C. The bulb glows when the material is inserted in the circuit
5. Which of the following situations shows that a material is an insulator?
A. The bulb glows brightly when the material is inserted in the circuit.
B. The material attracts iron objects.
C. The bulb does not glow when the material is inserted in the circuit.
D. The material is shiny.
C. The bulb does not glow when the material is inserted in the circuit.