NCERT Solutions For Class 6 Science Chapter – 12
Q1. Fill in the blanks:
- A device that is used to break an electric circuit is called______.
- An electric cell has ______ terminals.
Answer:-
- The switch
- Two
Q2. Mark true or false for the following statements:
- Electric Current can flow through metals.
- Instead of metal wires, a jute string can be used to make a circuit.
- Electric current can pass through a sheet of thermocol.
Answer:-
- True
- False
- False
Q3. Explain why the bulb would not glow in the arrangement
Answer:-
In the given arrangement shown in the figure above the bulb would not glow because the screw/ tester driver is made up of plastic and plastic is poor conductor of electricity.
Q4. Complete the drawing shown in Fig 12.14 to indicate where the free ends of the two wires should be joined to make bulb glow.
Answer:-
The completed figure is shown below:
Q5. What is the purpose of using an electric switch ? Name some electrical gadgets that have switches built into them.
Answer:-
The purpose of using an electric switch is to make electric circuit open or closed for a particular appliance.
Some electrical gadgets that have switches built into them are table , fan , torchlight , etc.
Q6. Would the bulb glow after completing the circuit shown in Figure 12.14 If instead of safety pin we use an eraser?
Solution:-
No, the bulb will not glow as eraser is an insulator.
Q7. Would the bulb glow in the circuit shown in Figure 12.15 ?
Answer:-
No , the bulb will not glow.
Q8. Using the “conductor tester’ on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator ? Explain.
Answer:-
The object is a conductor because the bulb glows only when the conductor is used but not when the insulator is used.
Q9. Why should an electrician use rubber gloves while repairing an electric switch at your home ? Explain.
Answer:-
An electrician uses rubber gloves while repairing an electric switch at your home because rubber gloves are insulators. This protects him from avoiding electric shocks.
Q10. The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastics or rubber covers on them . Can you explain why ?
Answer:-
Tools like screwdrivers and pliers are used by electricians for repair work because plastics is an insulator and plastics handles protect the electrician fro electric shocks.