Get premium membership and access questions with answers, video lessons as well as revision papers.
- A diverging lens of focal length 10cm produces a virtual image half the size of the object. Find the distance between the object from the...(Solved)
A diverging lens of focal length 10cm produces a virtual image half the size of the object. Find the distance between the object from the lens.
Date posted: September 12, 2019. Answers (1)
- In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:(Solved)
In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:
Mass of empty density bottle = 43.2g
Mass of density bottle full of water = 66.4g
Mass of density bottle with some sand = 67.5g
Mass of density bottle with the sand filled up with water = 82.3g
Use the above data to determine the;
a) Mass of the water that completely filled the bottle.
b) Volume of water that completely filled with the bottle.
c) Volume of the density bottle;
d) Mass of sand
e) Mass of water that filled the space above the sand.
f) Volume of the sand
g) Density of the sand
Date posted: September 12, 2019. Answers (1)
- A solid weighs 18.5N on the surface of the moon. The force of gravity on the moon is 1.7N/kg. Determine the mass of the solid.(Solved)
A solid weighs 18.5N on the surface of the moon. The force of gravity on the moon is 1.7N/kg. Determine the mass of the solid.
Date posted: September 12, 2019. Answers (1)
- The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the...(Solved)
The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the object.
i) State the type of lens used.
ii) Determine the object distance.
iii) Determine the radius of curvature.
iv) State one application of the lens as used in question (b) above.
Date posted: September 12, 2019. Answers (1)
- What is meant by a step-up transformer?(Solved)
What is meant by a step-up transformer?
Date posted: September 12, 2019. Answers (1)
- The figure below shows part of the lighting circuit of a house.(Solved)
The figure below shows part of the lighting circuit of a house.
i) Explain why a fuse is included in the circuit.
ii) Explain why the fuse is placed in the live wire rather than in the neutral wire.
iii) Each lamp has a power of 60 W. Calculate the current through one lamp when it is switched on.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a section of a flexible wire carrying current perpendicularly out of the paper.The wire moves in the direction shown as current...(Solved)
The figure below shows a section of a flexible wire carrying current perpendicularly out of the paper.The wire moves in the direction shown as current passes through it.
i) Label the polarities of the magnets A and B.
ii) Explain the behaviour of the flexible wire.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m(Solved)
The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m
Calculate the:
i) Weight of sea water displaced by the buoy (density of sea water = 1100kgm-3)
ii) Upward force exerted on the buoy by the water.
iii) The tension on the string.
Date posted: September 12, 2019. Answers (1)
- The diagram below shows two parallel mirrors M1 and M2 and a ray of light being incident on one of the mirrors as shown. Trace...(Solved)
The diagram below shows two parallel mirrors M1 and M2 and a ray of light being incident on one of the mirrors as shown. Trace the ray of light through the mirrors.
Date posted: September 12, 2019. Answers (1)
- State the unit specific latent heat of a substance.(Solved)
State the unit specific latent heat of a substance.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.(Solved)
The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.
X and Y are metal contact while P and Q are identical bulbs. Explain the effect on the bulb when ice cold water is poured onto the strip.
Date posted: September 12, 2019. Answers (1)
- Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.(Solved)
Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.
Determine the total extension of the system.
Date posted: September 12, 2019. Answers (1)
- The graph below is a sketch of a velocity-time graph of a car which was travelling at a constant velocity before the brakes were applied....(Solved)
The graph below is a sketch of a velocity-time graph of a car which was travelling at a constant velocity before the brakes were applied. Calculate the distance traveled after the brakes were applied.
Date posted: September 12, 2019. Answers (1)
- Distinguish between threshold frequency and threshold wavelength.(Solved)
Distinguish between threshold frequency and threshold wavelength.
Date posted: September 12, 2019. Answers (1)
- The figure below shows an object placed infront of a prism as shown.
Using two rays show the image of the object as observed by an...(Solved)
The figure below shows an object placed infront of a prism as shown.
Using two rays show the image of the object as observed by an observer at E.
Date posted: September 12, 2019. Answers (1)
- Give a reason why lecture theatre halls are covered with soft perforated materials.(Solved)
Give a reason why lecture theatre halls are covered with soft perforated materials.
Date posted: September 12, 2019. Answers (1)
- Explain why a p-n junction diode will conduct when connected in forward bias.(Solved)
Explain why a p-n junction diode will conduct when connected in forward bias.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a combination of capacitors across a power supply.(Solved)
The figure below shows a combination of capacitors across a power supply.
Determine the energy stored in the system of capacitors.
Date posted: September 12, 2019. Answers (1)
- State one differences between an image formed by a plane mirror and that observed through a pinhole camera.(Solved)
State one differences between an image formed by a plane mirror and that observed through a pinhole camera.
Date posted: September 12, 2019. Answers (1)
- The diagram below shows an electrical appliance connected to the mains.(Solved)
The diagram below shows an electrical appliance connected to the mains.
I. Name the color codes for leads A and B
II. What is the purpose of the fuse.
Date posted: September 12, 2019. Answers (1)