GCE FREE PHYSICS 2016 ANSWERS HERE!!

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PHYSICS OBJ:
1-10: ADDCCCDBCA
11-20: DDCADBBCAB
21-30: BBDCDBABDC
31-40: ABABDDDDBD
41-50: AACDABDACD
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4a
-They are used in the fields of communications,
4b
-warfare
-in exploring spac
12a . decay constant is define as the instantaneous rate
of decay per unit atom of a substance.
9 )Boyle's law state that a law stating that the pressure of
a given mass
of an ideal gas is inversely proportional to its
volume at a constant temperature.
9 bi) Renewable energy is energy generated from
natural resources—such as sunlight, wind, rain,
tides and geothermal
9bii) rain
wind
Sunlight
Geothermal
12a . decay constant is define as the instantaneous rate
of decay per unit atom of a substance.

1)

Velocity of projection U_p =10m/s

T= sqr root 2h/g

Where H=1

G=10

T=sqr root 2*1/10

=sqr root 0.2

=0.447s

V=UsinTita + gt

V=10sin90 + 10*0.447

V=10 +4.45

V=14.5m/s

3a In physics, a standing wave – also known as
a stationary wave – is a wave in a medium in
which each point on the axis of the wave has an
associated constant amplitude. The locations at
which the amplitude is minimum are called
nodes, and the locations where the amplitude is
maximum are called antinodes
Question 5
At atmospheric pressure, air and other gases
are poor conductors (Insulators) of electricity.
Because, they don’t have any free electrons to
carry current. But, once the free electrons are
produced in gas byionization (they become
plasmas), electric discharge occurs. This could
be done in many ways such as by applying a
large potential difference across a gas column at
very low pressure, or by allowing high
frequency EM-waves such as the X-Rays through
the gas. This question is not proper to ask.
Indeed, gases become plasmas once they’re
ionized! All dielectrics have a certain value
ofbreakdown potential. In most of them like air,
ceramics, etc. (including semiconductors like
Silicon), this potential provides sufficient energy
to ionize a few atoms. The free electrons formed
as a result of this ionization are energized
enough to bump the neighborhood atoms, break
some covalent bonds and produce more free
electrons.

(12ai) Decay constant is defined as the

instantaneous rate of decay per unit atom of a

substance.

(12aii)

Halflife ,T=0.693/decay contant. Hence, decay

constant,llamda =0.693/T ; =0.693/3days;

=0.182day-1 i.e per day.

(12bi) the moderator of a nuclear fission reactor

is made up of graphite. Its function is that slow

down the movement of a neutron,so that the

chain reaction will not dry out.

(12bii) the control rods is made of Boron

steel.its function is to ensure movement of the

floor,so that it can shut off the reactor

automatically in case of electrical failure

10 a)

Sound Waves

1. Require a medium.

2. Travel with a speed of 332 m/s at 0 C.

3. Are longitudinal waves consisting of

compressions and rarefactions.

Light Waves

1. Do not require a medium

2. Travel with a speed of 3 *10 8 m/s.

3. Are electromagnetic waves consisting

of varying electric and magnetic fields.

(11a) principle of conservation of linear

Momentum states that in any system of colliding

objects the total momentum is always conserved

provided that there is net external force acting

on the system.

11b) Farad is the standard unit of capacitance

in the International System of Units (SI),

formally defined to be the capacitance of a

capacitor between the plates of which there

appears a potential difference of one volt when

it is charged by a quantity of electricity equal to

one coulomb. Symbol: F. Origin of farad

Expand.
11ci)
The brightness of the bulb remains the same
since the same current will flow through them
11cii)
a)The resistor should be connected in parallel
with the galvanometer
b)VR=Vg
I*R=0.05I*Rg
IR=0.05I*100
IR=5I
R=5I/I
R=5ohm
11di)
I=40sin5w(pie)t
but I=Iosin2(pie)ft
therefore 2(pie)ft=500(pie)t
2f=500
f=500/2
f=250Hz
11dii)
Io=40amp
11diii)
Ir.m.s=Io/sqroot2
=40/sqroot2
Ir.m.s=28.3amp
7)The effect of Doping a Semiconductors. The
addition of a small percentage of foreign atoms
in the regular crystal lattice of silicon or
germanium produces dramatic changes in their
electrical properties, producing n-type and p-
type semiconductors. Pentavalent impurities.
5)-traveling wave tubes
-Hall Effect sensors
-high temperature-resistant permanent magnets
-thin-film coating equipment
-flywheel storage systems.

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Thursday,15th September, 2016
Physics (Essay & Objective) 9.30a
12.15pm
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