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i) Provides a safe route for the current in case the live wire touches the casing of the appliance.
ii) The wire is at maximum potential . When there is a power surge in the wire, the fuse melts before the other wires,
breaking the circuit.
sharon kalunda answered the question on May 30, 2019 at 14:47
- The figure below shows a pin 60mm long placed a long the principal axis of a lens of focal length 50mm. The near end of...(Solved)
The figure below shows a pin 60mm long placed a long the principal axis of a lens of focal length 50mm. The near end of the pin is 80mm form the lens.
Determine the length of the image.
Date posted: May 30, 2019. Answers (1)
- i)The figure below shows an object 'O' in front of a lens.
By drawing appropriate rays, on the same figure, state the position of the image...(Solved)
i)The figure below shows an object 'O' in front of a lens.
By drawing appropriate rays, on the same figure, state the position of the image formed.
ii) Explain the adjustment you would make on the position of the object above in order to obtain a real magnified image.
Date posted: May 30, 2019. Answers (1)
- When does a convex lens form a virtual image?.(Solved)
When does a convex lens form a virtual image?.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a waver profile for a wave whose frequency is 2HZ
Determine the value of t3(s)(Solved)
The figure below shows a waver profile for a wave whose frequency is 2HZ
Determine the value of t3(s)
Date posted: May 30, 2019. Answers (1)
- Sound is a longitudinal pressure wave. Explain this statement.(Solved)
Sound is a longitudinal pressure wave. Explain this statement.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a conducting carrying current placed in the magnetic field and moves in the direction shown
Identify the polarities X and Y.(Solved)
The figure below shows a conducting carrying current placed in the magnetic field and moves in the direction shown
Identify the polarities X and Y.
Date posted: May 30, 2019. Answers (1)
- How many electric iron boxes rated 1000W could be safely connected to a 240V mains circuit fitted with a 13A fuse?(Solved)
How many electric iron boxes rated 1000W could be safely connected to a 240V mains circuit fitted with a 13A fuse?
Date posted: May 30, 2019. Answers (1)
- A ferromagnetic material is being magnetised by single stroking method. On the axes provided, sketch a graph to show how
the strength of the magnet being...(Solved)
A ferromagnetic material is being magnetised by single stroking method. On the axes provided, sketch a graph to show how
the strength of the magnet being created varies with number of strokes.
Date posted: May 30, 2019. Answers (1)
- Calculate the amount of heat required to melt 30g of ice that 0°C.
(Latent heat of fusion of ice is 3.34 × 105 j/Kg)
Give your answer...(Solved)
Calculate the amount of heat required to melt 30g of ice that 0°C.
(Latent heat of fusion of ice is 3.34 × 105 j/Kg)
Give your answer correct to two decimal places.
Date posted: May 30, 2019. Answers (1)
- A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube(Solved)
A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube
Date posted: May 30, 2019. Answers (1)
- An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State...(Solved)
An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State what happens to the reading.
(ii) Explain the force that causes observation in (i) above.
Date posted: May 30, 2019. Answers (1)
- The speed of a train, hauled by a locomotive varies as shown below as it travels between two stations along a straight
horizontal track.
Use the graph...(Solved)
The speed of a train, hauled by a locomotive varies as shown below as it travels between two stations along a straight
horizontal track.
Use the graph to determine:
i) the maximum speed of the train.
ii) The acceleration of the train during the first 2mins of the journey.
iii) The time during which the train is slowing down.
iv) The total distance, in metres, between the two stations.
v) The average speed in m/s of the train.
Date posted: May 30, 2019. Answers (1)
- A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.(Solved)
A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.
Date posted: May 30, 2019. Answers (1)
- A boy wants to rescue someone who has fallen through ice pond. Would it be safe to walk or crawl across the ice towards
him? Explain.(Solved)
A boy wants to rescue someone who has fallen through ice pond. Would it be safe to walk or crawl across the ice towards
him? Explain.
Date posted: May 30, 2019. Answers (1)
- A weather balloon contains 100m³ of helium when atmospheric pressure is 90Kpa. If the atmosphere pressure changes to
100Kpa, calculate the new volume.(Solved)
A weather balloon contains 100m³ of helium when atmospheric pressure is 90Kpa. If the atmosphere pressure changes to
100Kpa, calculate the new volume.
Date posted: May 30, 2019. Answers (1)
- Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a...(Solved)
Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a cylinder of carbon dioxide.
Describe how particles of carbon dioxide exert pressure.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.(Solved)
The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.
Date posted: May 30, 2019. Answers (1)
- A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i)...(Solved)
A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i) Upthrust on the solid when floating.
ii) Density of the liquid.
Date posted: May 30, 2019. Answers (1)
- The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added...(Solved)
The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added to the beaker.
Show on the figure the new pointer position.
Date posted: May 30, 2019. Answers (1)
- The figure shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with
water.
i) Indicate...(Solved)
The figure shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with
water.
i) Indicate and label on the diagram the forces acting on the cork.
ii) Write an expression showing the relationship between the forces.
Date posted: May 30, 2019. Answers (1)