Short Questions
1. Sketch the following two graphs,
Current
0
Pressure
0
Pressure
0
(3)
Ohmic Conductor
Voltage
Volume
1/Volume
2. The pulley system on the left shows a block with
weight 75 N is connected by a string and pulley
to a block of weight 100 N. The pulley system on
the right is identical except that the block
weighing 100 N is replaced by a force of 100 N
downward.
Initially the systems are at rest. But because of
the imbalance of the forces, the 75 N blocks both
accelerate upward and eventually hit the pulley.
Which 75 N block hits the pulley first, or do they both hit at the same time, and why?
3. One side of a ripple tank ABCD is raised slightly, and a ripple is started a P by a
finger,
A
(3)
C
P
B
D
B
a. What is a ripple tank?
b. Why is the ripple not circular?
c. Which side of the tank has been tilted, and has it been tilted upwards or
downwards?
4. Describe an experiment to demonstrate electromagnetic induction.
5. What is a Goldilocks zone, and what makes it so? Also give three examples of
planets in Goldilocks zone.
(1)
(1)
(1)
(3)
(3)
Long Questions
1. a. What is the photovoltaic effect?
b. How is it specifically employed in solar cells? Discuss in detail
2. a. Describe entropy.
b. Does an air conditioner increase or decrease the entropy of air? In either case,
how is that possible?
c. Give an example of entropy around your surroundings, and state whether an
increase or decrease in entropy occurs.
(1)
(4)
(1)
(2)
(2)
Question
Number
1.
Answer
1 mark
1 mark
1 mark
2.
1 mark: Right Diagram
1 mark: Due to lower tension
in left diagram
1 mark: Due to newton’s
second law
3.a.
1 mark: Glass tank of water
used to demonstrate
properties of waves
3.b.
1 mark: Tank tilted. Different
forces on wave on either side
of P
3.c.
1 mark: A or B or AB or Left
Side
4.
5.
1.a.
1.b.
2.a.
1 mark: Bar magnet through
a wire coil
1 mark: Measure the
resulting Electric Current
through wire
1 mark: Current is induced
only when the magnet moves
with respect to the coil
1 mark: Habitable zone in
area around a star
1 mark: Water is liquid (not
too hot or cold)
1 mark: Any three correct
planets
1 mark: Process that
generates voltage through
sunlight or Process that
generates electric current
through sunlight
1 mark: Solar cells
composed of two types of
semi-conductors
1 mark: Explain p-type and
n-type
1 mark: Explain p-n junction
and movement of electrons
from n-type to p-type or
movement of holes from ptype to n-type
1 mark: Sunlight activates
the flow of electrons
1 mark: Degree of disorder
or uncertainty in a system
(simplest possible)
2.b.
2.c.
1 mark: A.C do not increase
entropy of air
1 mark: Decrease is possible
because there is an even
larger entropy gain to
balance loss when electricity
to power the A.C. is produced
(no need to go in detail)
1 mark: Any relevant
example
1 mark: “increase or
decrease” in entropy should
be correct according to
example