Time:-1
hour
M.M.:-20
1.
Why is tungsten metal selected
for making filaments of incandescent lamp bulbs? (1)
2.
Relate kWh with joule? (1)
3.
What are superconductors? Who
invented it? (2)
4.
How is the fuse wire connected?
What is its advantage? (2)
5.
Classify materials into various
kinds based on their conducting property? How are superconductors different
from this? (2)
6.
A wire of length l, area of
cross section A and material of resistivity ρ is cut into two parts in the ratio 1:3 of length. Find the ratio of
their (i)resistivity and (ii)resistance. (2)
7.
How much current will an
electric heater rated 1 kW draw when connected to 250 V? (2)
8.
You have 3 resistances of value
R each. How will you connect these for obtaining a total resistance of 3R/2 ? Show
this connection by a diagram?(2)
9.
A toaster produces more heat
than a light bulb when connected in a parallel to the 220 V mains. Which of the
two has greater resistance? (3)
10.
Geyser draws a current of 15A
from the main line for half an hour to heat water. Calculate the amount of
charge that flows through the filament. (3)
Time:-1
hour
M.M.:-20
1.
Why is tungsten metal selected
for making filaments of incandescent lamp bulbs? (1)
2.
Relate kWh with joule? (1)
3.
What are superconductors? Who
invented it? (2)
4.
How is the fuse wire connected?
What is its advantage? (2)
5.
Classify materials into various
kinds based on their conducting property? How are superconductors different
from this? (2)
6.
A wire of length l, area of
cross section A and material of resistivity ρ is cut into two parts in the ratio 1:3 of length. Find the ratio of
their (i)resistivity and
(ii)resistance. (2)
7.
How much current will an
electric heater rated 1 kW draw when connected to 250 V? (2)
8.
You have 3 resistances of value
R each. How will you connect these for obtaining a total resistance of 3R/2 ?
Show this connection by a diagram?(2)
9.
A toaster produces more heat
than a light bulb when connected in a parallel to the 220 V mains. Which of the
two has greater resistance? (3)
10.
Geyser draws a current of 15A
from the main line for half an hour to heat water. Calculate the amount of
charge that flows through the filament.
(3)
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