Revision worksheet for year 12 physics

1. YEAR 12 PHYSICS REVISION
Show necessary working for questions 8-18 as partial marks will be awarded for correct working.
The number of significant figures in 0.060 is
A. 1
B. 2
C. 3
D. 4
An instrument that measures both the inside and outside diameter of a circular object is a
A. metre rule.
B. micrometre.
C. vernier caliper.
D. measuring tape.

2. 3. A particle is moving in circular motion if it travels with:
Variable speed with a constant force acting in the direction of the motion.
Constant speed with no resultant force acting on it
Constant speed with a constant force acting in the direction of motion.
Constant speed with a constant force directed towards the centre of the
motion.
4. According to the principle of floatation a floating body displaces
its own weight of fluid
its own volume of fluid
less than its weight of fluid
more than its own volume of fluid

3. 5. What is the name given to the amount of energy
needed to turn 1 kg of water at 100°C into steam?
Specific latent heat
Specific heat capacity
Latent heat of fusion
Latent heat of vaporisation

4. 6. The lunar eclipse (eclipse of the moon) happens when
the moon passes through the shadow of the earth.
the earth passes through the shadow of the moon.
the moon passes through the shadow of the sun.
the earth is in the shadow of the sun.
7. The observation about light that strongly supports the wave theory of light is
reflection of light.
diffraction of light.
scattering of light.
formation of shadows.
8. The diagram below shows a wave that has a shape like a sine curve
The amplitude of the wave is given by which distance?
OP
PQ
OX
OY

5. Each of the diagrams below shows a straight wave train arriving
at an opening, represented by the bold lines. Which diagram
shows a situation in which diffraction will occur most
effectively?
The diagram below represents shallow water waves of constant
wavelength passing through two small openings, A and B, in a
barrier.
Which statement best describes the interference at point P?
It is destructive with shorter wavelengths.
It is destructive with smaller amplitude.
It is constructive with longer wavelengths.
It is constructive with larger amplitude.

6. Water from a 30 m high dam falls on a turbine at the rate of 500 kgs-1
Calculate the potential energy of the water that falls on the turbine in 1
second. (1 marks)
What is the energy conversion shown in the diagram?
(1 marks)
A 5 kg mass moves east at 2 ms-1 and breaks suddenly into two pieces, A and
B, that move away at right angles to each other. A has a mass of 3 kg and a
speed of 2 ms-1
What is the total momentum of the mass before it breaks up?
(1 mark)
Determine the velocity of the piece B. (1 mark)

7. A circle has a radius of 4.00 ± 0.06 m.
(i) Find the percentage uncertainty of the given radius.
(1 mark)
(ii) Calculate the area of the circle, giving the answer with the appropriate uncertainty.
(1 mark)
The diagram below shows a monochromatic light source, slits, and a screen arranged
for an experiment on light. Light and dark bands form on the screen. The diagram is
not to scale.
The two slits form coherent sources of light. What does coherent mean?
(1 mark)
Explain how the dark bands are formed on the screen.
(1 mark)
The distance between the centres of the double slit is 0.15 mm, and the distance
between the double slits and the screen is 0.75 m. The light has a wavelength of 590
nm. Calculate the distance on the screen from the centre of the central bright band to
the centre of the second bright band. (1 marks)