1
[1] How much
work is done in moving a charge of 75 C across two points having a potential
difference 220 V?
2
[3] Three
Registers of magnitudes 12 W, 15W and 20W are connected in (i) Series & (ii) Parallel.
Calculate the combined resistance in both the cases.
3
[1] How many
joules are there in one kilowatt-hour?
4
[2] Three
resistors of 10 W ,20 W and 30 W are connected in parallel with 6-V cell. Find (a) The
current through each resistor (b) The current supplied by the cell (c) the
equivalent resistance of the circuit.
5
[2,2] (a)How will you join three resistors of resistances 4 Ω, 6 Ω and
12 Ω to get an equivalent resistance of 8 Ω?
(b) what would be the highest and lowest
equivalent resistances possible by joining these resistances.
6
[4] A
household uses the following electric appliances :
(i)
Refrigerator of rating 400W for ten hours each day.
(ii) Two
electric fans of rating 80W each for twelve hours each day.
(iii) Six
electric tubes of rating 18W each for 6 hours each day.
Calculate
the electricity bill of the household for the month of June if the cost per
unit of electric energy is Rs. 3.00.
7
[5] Find out the following in the electric circuit
given in Figure.
(a) Effective resistance of
two 8
W resistors in the combination
(b) Current
flowing through 4 W resistor
(c) Potential
difference across 4 W resistance
(d) Power
dissipated in 4 W resistor
(e)
Difference in ammeter readings,
if any.
8
[4] Two water taps together can fill a tank in 75/8 hrs. The tap of larger
diameter takes 10 hrs less than the smaller one to fill the tank separately.
Find the time in which each tap can separately fill the tank.
9
[4]A passenger
train takes 2 hours less for a journey of 300km. If its speed is increased by
5km/hr from its original speed. Find the original speed of the train.
10
[4]Some
students arranged a picnic. The budget for food was Rs 240, because four
students of the group failed to go, the cost of food to each student got
increased by Rs 5. How many students went for the picnic?
11
[4] Five years
ago, Sagar was twice as old as Tiru. Ten years later Sagar's age will be ten
years more than Tiu's age. Find their present ages. What was the age of Sagar
when Tiru was born?
12
[4] In a class
test, the sum of the marks obtained by P in Mathematics and Science is 28. Had
he got 3 more marks in Mathematics and 4 marks less in Science, the product of
marks obtained in the two subjects would have been 180. Find the marks obtained
in the two subjects separately.
13
[HW] The sum
of the areas of two squares is 640 m2. If the difference in their
perimeters be 64 m, find the sides of the two squares.
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