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The figure below represents a ray of light falling normally on the curved surface of a
semi- circular glass block A at an angle of 32°...
(Solved)
The figure below represents a ray of light falling normally on the curved surface of a
semi- circular glass block A at an angle of 32° at O and emerging into air at an angle of 48°
Calculate the absolute refractive index of the glass of which the block is made.
(Assume air is a vacuum)
Date posted:
April 4, 2019
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Answers (1)
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The refractive index of paraffin is 1.47 and that of glass is 1.55. Determine the critical
angle of a ray of light travelling from glass to...
(Solved)
The refractive index of paraffin is 1.47 and that of glass is 1.55. Determine the critical
angle of a ray of light travelling from glass to paraffin
Date posted:
April 4, 2019
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Answers (1)
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By use of a ray; diagram, show how a concave mirror may be a dentist mirror
(Solved)
By use of a ray; diagram, show how a concave mirror may be a dentist mirror
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows an object placed in front of a plane mirror. Draw appropriate rays to
locate the image as seen by the observer.
(Solved)
The figure below shows an object placed in front of a plane mirror. Draw appropriate rays to
locate the image as seen by the observer.
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a magnetic material being magnetized
(Solved)
The figure below shows a magnetic material being magnetized
Complete the diagram showing the windings on the magnetic material so as to produce polarities
at A and B both south poles
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a diagram of a simple electric generator
(Solved)
The figure below shows a diagram of a simple electric generator
i) Label the parts P and Q
ii) Identify the polarities of the poles X and Y
iii) State two ways of increasing the voltage – output in this generator
Date posted:
April 4, 2019
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Answers (1)
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Using a well- labeled diagram explain how a moving coil meter works
(Solved)
Using a well- labeled diagram explain how a moving coil meter works
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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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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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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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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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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A hydraulic machine is used to raise a load of 100kg at a constant velocity through a height
of 2.5m. The radius of the effort piston...
(Solved)
A hydraulic machine is used to raise a load of 100kg at a constant velocity through a height
of 2.5m. The radius of the effort piston is 1.4cm while that of the load piston is 7.0cm. Given
that the machine is 80% efficient, calculate:-
(i) The effort needed
(ii) The energy wasted in using the machine
Date posted:
April 4, 2019
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Answers (1)
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Name one machine that has a velocity ratio of less than one (V.R < 1)
(Solved)
Name one machine that has a velocity ratio of less than one (V.R < 1)
Date posted:
April 4, 2019
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Answers (1)
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An inclined plane of length 5m is used to raise a body of mass 60kg to the back of a lorry. If the
plane is inclined...
(Solved)
An inclined plane of length 5m is used to raise a body of mass 60kg to the back of a lorry. If the
plane is inclined at an angle 25° from the horizontal, calculate the efficiency of the system given
that a constant force of 650 N is used to push the body up the plane
Date posted:
April 4, 2019
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Answers (1)
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A ball of mass 100g is kicked horizontally from the top of a cliff. If the ball takes 4 seconds
to hit the ground, determine the...
(Solved)
A ball of mass 100g is kicked horizontally from the top of a cliff. If the ball takes 4 seconds
to hit the ground, determine the height of the cliff
Date posted:
April 4, 2019
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Answers (1)
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A faulty thermometer records 11oC instead of 0oC and 98oC instead of 100oC. Determine the reading on the thermometer when dipped in liquid at a temperature...
(Solved)
A faulty thermometer records 11oC instead of 0oC and 98oC instead of 100oC. Determine the reading on the thermometer when dipped in liquid at a temperature of 56oC
Date posted:
April 4, 2019
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Answers (1)
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The velocity-time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of the moon....
(Solved)
The velocity-time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of the moon. The weight of the object on earth’s surface is 20N, when the acceleration due to gravity is 10ms-2.
(i) State why the velocity becomes negative after 3seconds.
(ii) Determine the acceleration of free fall on the moon showing clearly your work
(iii) Determine the total distance travelled by the ball in 5.0sec
(iv) Find the weight of the ball on the moon
Date posted:
April 4, 2019
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Answers (1)