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PHYSICS 1 2013
Where necessary the following constants may be used:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
Acceleration due to gravity, g = 10 N/kg or 10 m/s
3
Density of air = 1
...
14
2
SECTION A (30 Marks)
Answer all questions in this section
...
For each of the items (i) – (x), choose the correct answer among the given
alternatives and write its letter beside the item number
...
What will be their resultant force?
A
11
...
4
D
1
...
12 N
(ii)
Which of the following are good examples of ferromagnetic materials?
A iron and ceramic
B zinc and iron
C copper and nickel
D nickel and cobalt
E
cobalt and ceramic
(iii)
A white shawl wrapped around a baby keeps the baby warm because the
shawl
A is a poor reflector
B is a poor radiator
C has pockets of air trapped in it
D conducts heat to the baby
E
stops convection currents
...
(v)
The correct statements about sound waves is that they
A are transverse waves
B can travel in vacuum
C can be polarized
D cannot be polarized
E
do not require medium
...
(vii)
The battery in the circuit shown in the following diagram has an e
...
f
...
What will be the current flowing in the 6 Ω resistor?
A
0
...
64 A
C
1
...
10 A
E
0
...
(ix)
Which of the following particles is used to cause fission in an
atomic reaction?
A
proton
B
deuteron
C
neutron
D
beta-particle
E alpha-particle
(x)
The layer in the atmosphere where weather phenomena are formed is
called
A
stratosphere
B
magnetosphere
C
thermosphere
D
troposphere
E
exosphere
...
Match the items in List A with responses in List B by writing the letter of
the correct response beside the item number
...
(ii) The amplitude levels which usually occurs
in any digital signal
...
(iv) Increases the electrical conductivity of a
semiconductor
...
(vi) The region near the boundary which is fairly
free of majority charge carriers
...
(viii) Increases the region or width of the
depletion layers and rise the potential
barrier
...
(x) The relationship between input signal and
output signal of an amplifier
...
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
List B
Light-emitting
diode (LED)
Transducers
Rectification
Bipolar transistor
Semiconductors
Valence band
Nodes
Fermi level
Reverse bias
Transfer function
n-type doping
Dopants
Forbidden
Thermistors
Depletion layer
For each of the items (i)-(x), fill in blank spaces by writing the correct answer on
the space provided
...
(iv)
The production of an e
...
f
...
(v)
The combination of multiple echoes in the listener’s ear produce a louder
and more sustained sound called
...
(vi)
When the temperature at the surface is below the freezing point, dew takes
the form of ice called
...
(viii) Wheelbarrows and bottle openers are in the
levers
...
(x)
A resistor of low resistance used to convert a moving coil galvanometer
into an ammeter is called
...
4
...
(a)
Mention three differences between boiling and evaporation
...
(i) Define coefficient of linear expansion and give its SI unit
...
3% when carrying a steam at 100°C
...
The half-life of a certain radioactive substance is 64 days
...
(b)
A certain radioactive material has a half-life of 2 minutes
...
Write the nuclear equation for this process
...
(a)
Briefly explain why
(i)
Nylon clothes crackle when undressed?
(ii)
Petrol road tankers usually have a length of metal chain hanging
and touching the ground?
(b)
(c)
7
...
(ii)
Two cells each of e
...
f
...
Find
the current flowing in the 10 Ω resistor
...
Briefly explain the reasons for the following:
(i)
A person at great height suffers from nose bleeding
...
A cube of sides 2 cm is completely submerged in water so that the
bottom of the cube is at a depth of 10 cm
...
(ii)
the weight of water displaced by the cube
...
(b)
(c)
9
...
(ii)
The cork of a bottle of mass 4 g is ejected with a velocity of 10
m/s in 0
...
Find the force exerted on the bottle
...
0 kilowatts
...
(a)
What is meant by the following terms as used in geophysics:
(i)
Tsunami
...
(b)
(i) List down the various layers of the atmosphere starting from the
Earth’s surface
...
(c)
(i) What is a constellation?
(ii)
Briefly explain the causes of ocean tides
...
10
...
(ii)
Mention two advantages of a
...
generators over d
...
generators
...
(i) Briefly explain why the core of a transformer is made of thin layers of
metal insulated from one another
...
A transformer with 4800 turns in the primary coil is designed to work
form 240 V a
...
mains to give a supply of 8 V in order to ring a bell
...
c
...
(b)
(i) What is a simple pendulum
...
(c)
Name a machine or an apparatus used to change the following forms
of energy
...
(ii)
Mechanical energy to electrical energy
...
(iv)
Sound energy to electrical energy
...