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The diagram figure below shows an electromagnet made by a student of Nyamogo Girls
secondary school, in the laboratory. The magnet was meant to pick up...
(Solved)
The diagram figure below shows an electromagnet made by a student of Nyamogo Girls
secondary school, in the laboratory. The magnet was meant to pick up and release a metal object
(i) Name giving reasons a suitable material for part X
(ii) The electromagnet will just lift a metal of mass 150g. Taking g = 10N/Kg, what will be the
least force exerted by the magnet to do this
(iii) State the changes which the student should make so that a heavier metal object could be
lifted by the magnet
(iv) Explain why the strength of the above magnet cannot be increased indefinitely
Date posted:
April 4, 2019
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Answers (1)
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Draw the magnetic field pattern around the magnets below.
(Solved)
Draw the magnetic field pattern around the magnets below.
Date posted:
April 4, 2019
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Answers (1)
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Two pins are attached to each of the magnets as shown below.
(Solved)
Two pins are attached to each of the magnets as shown below.
Explain the behaviour of pins in each case.
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a micrometer screw gauge being used to measure the diameter of a rod.
The thimble scale has 50 divisions.
(Solved)
The figure below shows a micrometer screw gauge being used to measure the diameter of a rod.
The thimble scale has 50 divisions.
What is the reading?
Date posted:
April 4, 2019
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Answers (1)
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A gold leaf electroscope is positively charged as shown in the diagram in figure where C is the cap and L is the gold leaf....
(Solved)
A gold leaf electroscope is positively charged as shown in the diagram in figure where C is the cap and L is the gold leaf. State and explain what happens to L when a positively charged rod is
brought near C without touching it.
Date posted:
April 4, 2019
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Answers (1)
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In the figure below, explain what happens when one of the metal balls comes into contact with
a negatively charged rod.
(Solved)
In the figure below, explain what happens when one of the metal balls comes into contact with
a negatively charged rod.
Date posted:
April 4, 2019
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Answers (1)
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Two identical spheres A and B each standing on an insulated base are in contact. A
negatively charged rod is brought near sphere A as shown...
(Solved)
Two identical spheres A and B each standing on an insulated base are in contact. A
negatively charged rod is brought near sphere A as shown below
In what way will A differ from B if separated while the rod is near?
Date posted:
April 4, 2019
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Answers (1)
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Two metal cons A and B of different sizes rest on two identical gold leaf electroscope as shown.
(Solved)
Two metal cons A and B of different sizes rest on two identical gold leaf electroscope as shown.
Compare the divergence of the gold leaves of the two electroscopes. Explain your answer
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows an uncharged pith ball under the attraction of a charged ball.
(Solved)
The figure below shows an uncharged pith ball under the attraction of a charged ball.
State and explain what would be observed after the two pith balls touch
Date posted:
April 4, 2019
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Answers (1)
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The length of a pinhole camera is 20cm. Determine the height of a storey building 300m away
from the pin hole if the image formed on...
(Solved)
The length of a pinhole camera is 20cm. Determine the height of a storey building 300m away
from the pin hole if the image formed on the screen of the pin hole camera is 2.5cm high
Date posted:
April 4, 2019
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Answers (1)
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Explain why transformers are widely used throughout the national grid system
(Solved)
Explain why transformers are widely used throughout the national grid system
Date posted:
April 4, 2019
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Answers (1)
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A coil of wire is connected in series with a battery, a rheostat and a switch as shown in figure
(Solved)
A coil of wire is connected in series with a battery, a rheostat and a switch as shown in figure
(i) Draw on the diagram, the shape of the magnetic field inside and outside the coil when the
switch is closed.
If the jockey J on the rheostat is moved towards Q what’s the effect on:-
(ii)The resistance of the circuit
(iii) The current through the coil
(iv) The magnetic field in the coil
Date posted:
April 4, 2019
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Answers (1)
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A student hung a magnet next to a coil of wire to make a door chime as shown in figure :-
(Solved)
A student hung a magnet next to a coil of wire to make a door chime as shown in figure :-
i) Explain how the current made the magnet move towards the chime bar
(ii) What should the student do to make the magnet hit the chime bar harder?
Date posted:
April 4, 2019
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Answers (1)
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The current capacity of an accumulator is 40Ah. Find the amount of current flowing if the
accumulator is used for 600 minutes
(Solved)
The current capacity of an accumulator is 40Ah. Find the amount of current flowing if the
accumulator is used for 600 minutes
Date posted:
April 4, 2019
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Answers (1)
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In the diagram below, the U-tube contains two liquids; X and Y which do not mix. If the density
of liquid Y is 900Kgm-3 and that...
(Solved)
In the diagram below, the U-tube contains two liquids; X and Y which do not mix. If the density
of liquid Y is 900Kgm-3 and that of X is 1200Kgm-3, calculate the height of liquid Y
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows two mini buses A and B at a speed of 40m/s and 20m/s
respectively moving in opposite directions. They collided head on
(Solved)
The figure below shows two mini buses A and B at a speed of 40m/s and 20m/s
respectively moving in opposite directions. They collided head on
Determine the common speed of the vehicles if they stuck to each other
Date posted:
April 4, 2019
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Answers (1)
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A footballer kicks a ball of 600g initially at rest using a force of 900N. If the foot was in
contact with the ball for 0.1sec....
(Solved)
A footballer kicks a ball of 600g initially at rest using a force of 900N. If the foot was in
contact with the ball for 0.1sec. What was the take off speed of the ball?
Date posted:
April 4, 2019
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Answers (1)
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State the law of inertia
(Solved)
State the law of inertia
Date posted:
April 4, 2019
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Answers (1)
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A minibus of mass 2000kg traveling at a constant velocity of 36km/h collides with a stationary
car of mass 1000kg. The impact takes 2 seconds before...
(Solved)
A minibus of mass 2000kg traveling at a constant velocity of 36km/h collides with a stationary
car of mass 1000kg. The impact takes 2 seconds before the two move together at a constant
velocity for 20 seconds. Calculate:
(i) The common velocity
(ii) The distance moved after impact
(iii) The impulse force
(iv) The change in kinetic energy
Date posted:
April 4, 2019
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Answers (1)
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(i) complete the diagram below to show how the pulley can be used to raise a load L by
applying an effort E
(Solved)
(i) complete the diagram below to show how the pulley can be used to raise a load L by
applying an effort E
(ii) The pulley system above has a mechanical advantage of 3. Calculate the total work done
when a load of 60N is raised through a height of 9M
Date posted:
April 4, 2019
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Answers (1)