Do you think an electromagnet can be used for separating plastic bags
from a garbage heap? Explain.
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) To make a battery of two cells, the negative terminal of one cell is
connected to the negative terminal of the other cell. (T/F)
(b) When the electric current through the fuse exceeds a certain limit,
the fuse wire melts and breaks. (T/F)
(c) An electromagnet does not attract a piece of iron. (T/F)
(d) An electric bell has an electromagnet. (T/F)
Fill in the blanks:
(a) Longer line in the symbol for a cell represents its terminal.
(b) The combination of two or more cells is called a .
(c) When current is switched ‘on’ in a room heater, it .
(d) The safety device based on the heating effect of electric current is
called a .
When the current is switched on through a wire, a compass needle kept
nearby gets deflected from its north-south position. Explain.
Draw in your notebook the symbols to represent the following
components of electrical circuits: connecting wires, switch in the ‘OFF’
position, bulb, cell, switch in the ‘ON’ position, and battery
Which of the following relations is correct?
(i) Speed = Distance × Time (ii) Speed =
Distance
Time
(iii) Speed =
Time
Distance (iv) Speed =
1
Distance Time
A car moves with a speed of 40 km/h for 15 minutes and then with a
speed of 60 km/h for the next 15 minutes. The total distance covered by
the car is:
(i) 100 km (ii) 25 km
(iii) 15 km (iv) 10 km
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