NCERT Solutions for Class 6th Science
Chapter 12 - ELECTRICITY AND CIRCUITS
(Complete Downloadable Chapter Solution PDF file is at the bottom of the page)
Q.1 Fill in the blanks:
(a) A device that is used to break an electric circuit is called _______________.
(b) An electric cell has _______________ terminals.
Ans (a) A device that is used to break an electric circuit is called switch.
(b) An electric cell has two terminals.
Q.2 Mark 'True' or 'False' for following statements:
(a) Electric current can flow through metals.
(b) Instead of metal wires, a jute string can be used to make a circuit.
(c) Electric current can pass through a sheet of thermo Col.
Q.3 Explain why the bulb would not glow in the arrangement shown in Fig. 12.13.
Q.4 Complete the drawing shown in Fig 12.14 to indicate where the free ends of the two wires should be joined to make the bulb glow.
Q.5 What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.
Q.6 Would the bulb glow after completing the circuit shown in Fig. 12.14 if instead of safety pin we use an eraser?
Q.7 Would the bulb glow in the circuit shown in Fig. 12.15?
Q.8 Using the "conduction tester" on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.
Ans The bulb begins to glow which shows that the object allowed current to pass through it. Hence it is a conductor.
Q.9 Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.
Ans Electric switch (containing wires) conducts electricity and as human body is a good conductor of electricity, the electrician may get shock while repairing an electric switch. Since rubber is a bad conductor of electricity and does not allow current to pass, it protects electrician from the shock.
Q.10 The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?