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What is meant by a step-up transformer?
(Solved)
What is meant by a step-up transformer?
Date posted:
September 12, 2019
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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State the unit specific latent heat of a substance.
(Solved)
State the unit specific latent heat of a substance.
Date posted:
September 12, 2019
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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Distinguish between threshold frequency and threshold wavelength.
(Solved)
Distinguish between threshold frequency and threshold wavelength.
Date posted:
September 12, 2019
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
(Solved)
A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
Date posted:
September 12, 2019
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Answers (1)
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The figure below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is...
(Solved)
The figure below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is in liquid A. Density of liquid B is 800kg/m³
(Take g = 10N/kg).
a.Determine
(i) Weight of liquid B displacement.
(ii) Weight of liquid A displaced.
iii) Volume of A.
b.The sphere is now anchored at the base of the container that ¼ of its volume is in liquid A. Find the tension in the string.
Date posted:
September 12, 2019
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Answers (1)
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Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S. Density of ice...
(Solved)
Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S. Density of ice is 0.9g/cm³
Date posted:
September 12, 2019
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Answers (1)
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Explain the energy change that occur when a man climbs the mountain.
(Solved)
Explain the energy change that occur when a man climbs the mountain.
Date posted:
September 12, 2019
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Answers (1)
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A loudspeaker is a transducer. Explain.
(Solved)
A loudspeaker is a transducer. Explain.
Date posted:
September 12, 2019
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Answers (1)