WAEC GCE 2016 PHYSICS Answer Now Available Here

2)-Concentration of electrolyte

-Nature of electrode

-Positions of ions in the electrochemical series

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11a) the rigidity of the springs

11b) the farade is the capacitance of a capacitor when a potential difference of 1volt rises across it when a charge of 1colomb is placed on it

11ci) if more bulbs are added in series, the bulbs dim because the voltage drop across them decreases

11cii) a# the resistor should be placed across the galvanometer in parallel

B# Voltage across galvanometer = voltage across resistor

Vg = Vr

Irg = (I-i)R

0.05 * 100 = (0.95)R

5 = 0.95R

R = 5/0.95

R = 5.26olms

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5)

Applications of permanent magnet:

i) in telephone earpiece

ii) in electrical bell

iii) in generators

iv) in electrical motors

v) in induction coil systems

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4a)

i)They are used in the fields of communications

4b)

ii)warfare

ii)in exploring space

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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.

9bi) Renewable energy is energy generated from natural resources—such as sunlight, wind, rain, tides and geothermal

9bii)

rain

wind

Sunlight

Geothermal

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10a)

Sound Waves

i)Require a medium.

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

iii)Are longitudinal waves consisting of compressions and rarefactions.

Light Waves

i)Do not require a medium

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

iii)Are electromagnetic waves consisting of varying electric and magnetic fields.

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(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

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