Name the device used these days in place of electric fuses in
electrical circuits.
Which property of a conducting wire is utilised in making
electric fuse?
Which of the following precautions need not be taken while
using electric gadgets/appliances/circuit?
(a) We should never touch a lighted electric bulb connected
to the mains.
(b) We should never experiment with the electric supply from
the mains or a generator or an inverter
(c) We should never use just any wire or strip of metal in
place of a fuse.
(d) We should never turn the switch in ON position.
When a switch is in OFF position,
(i) circuit starting from the positive terminal of the cell stops
at the switch.
(ii) circuit is open.
(iii) no current flows through it.
(iv) current flows after some time.
Choose the combination of correct answer from the following.
(a) all are correct
(b) (ii) and (iii) are correct
(c) only (iv) is correct
(d) only (i) and (ii) are correct
Choose the statement which is not correct in the case of an
electric fuse.
(a) Fuses are inserted in electric circuits of all buildings.
(b) There is a maximum limit on the current which can safely
flow through the electric circuits.
(c) There is a minimum limit on the current which can safely
flow in the electric circuits.
(d) If a proper fuse is inserted in a circuit it will blow off if
current exceeds the safe limit.
Distance between Bholu’s and Golu’s house is 9 km. Bholu
has to attend Golu’s birthday party at 7 o’clock. He started
from his home at 6 o’clock on his bicycle and covered a distance
of 6 km in 40 minutes. At that point he met Chintu and he
spoke to him for 5 minutes and reached Golu’s birthday party
at 7 o’clock. With what speed did he cover the second part of
the journey? Calculate his average speed for the entire journey.
Plot a distance-time graph of the tip of the second hand of a
clock by selecting 4 points on x-axis and y-axis respectively.
The circumference of the circle traced by the second hand is
64 cm.
The average age of children of Class VII is 12 years and 3 months.
Express this age in seconds.
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