Previous Year Paper year:2015 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2015

with Solutions - page 4

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#4-b-i
Why does a current carrying, freely suspended solenoid rest along a particular
direction?
Ans : Current carrying freely suspended solenoid behaves just like a bar magnet with fixed polarities (North and South) at its ends. Hence it rest in North- South direction exactly in the same manner as a bar magnet does.

#4-b-ii
State the direction in which it rests.
Ans : North-South direction.

#4-c [2]
Find the equivalent resistance between points A and B.

Ans :

#4-d [2]
Give two similarities an AC generator and a DC motor
Ans :
(i) Both have a strong horse shoe permanent magnet or an electromagnet.
(ii) Both have an armature coil having soft iron core.

#4-e [2]

#4-e-i
Why is a cathode ray tube evacuated to a low pressure?
Ans : The cathode ray tube is evacuated to a low pressure so that the electrons may move without being obstructed by air molecules.

#4-e-ii
What happens if the negative potential is changed on a grid?
Ans : The variation of the negative potential on the grid affects the number of electrons reaching the anode and striking the screen changed which changes the brightness of pattern on the screen.

# [40]
Section : II
Attempt any four questions from this Section.

#5

#5-a [2]
Draw a simplified diagram of a lemon crusher, indicting of load and effort.
Ans :

#5-b [4]

#5-b-i
Name the physical quantity measured in terms of horse power.
Ans : Horse power is another unit of Power.
1 H.P = 746 watt.

#5-b-ii
A nut is opened by a wrench of length ``\pu{20 cm}``. If the least force required is ``\pu{2 N}``,
find the moment of force needed to loosen the nut.
Ans : Given : Force = 2N, d = 20 cm = 0.2 m.
Moment of force = Force x distance
= 2 x 0.2
= 0.4 Nm.

#5-b-iii
Explain briefly why the work done by a fielder when he takes a catch in a
cricket match is negative.
Ans : Work done is said to be negative when a force opposes the motion or tries to stop a moving body since the fielder also tries to stop the moving ball hence his work done is also negative.

#5-c [4]
A block and tackle system has V.R. = 5.