(i) Dispersion of white light
(ii) X – Red
Y – Violet
sharon kalunda answered the question on August 6, 2019 at 07:26
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A 5µF capacitor is charged to a potential difference of 200V and isolated. It is then connected
to a 10µF capacitor.Find
(i) The resultant potential difference across...
(Solved)
A 5μF capacitor is charged to a potential difference of 200V and isolated. It is then connected
to a 10μF capacitor.Find
(i) The resultant potential difference across the combination
(ii) Energy stored before connection
(iii) Total energy in the capacitors after connection
Date posted:
August 6, 2019
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Answers (1)
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The figure shows a human eye with a defect
(i) Identify the defect
(ii) Explain how the defect could be corrected
(iii) Draw a suitable diagram...
(Solved)
The figure shows a human eye with a defect
(i) Identify the defect
(ii) Explain how the defect could be corrected
(iii) Draw a suitable diagram to show the correction of the defect
Date posted:
August 6, 2019
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Answers (1)
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When the switch S is kept open in the circuit shown below the voltmeter reads 1.5V. When the switch is closed, the readings drops to...
(Solved)
When the switch S is kept open in the circuit shown below the voltmeter reads 1.5V. When the switch is closed, the readings drops to 1.3V and the current through the resistor is 0.5A.
(i) What is the e.m.f of the cell?
(ii) What the terminal voltage of the cell?
(iii) Calculate the value of R.
Date posted:
August 6, 2019
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Answers (1)
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The figure below shows how a student set up a circuit using 3 identical bulbs X, Y and Z
each rated “12V, 2.0A”
(i) When operating normally,...
(Solved)
The figure below shows how a student set up a circuit using 3 identical bulbs X, Y and Z
each rated “12V, 2.0A”
(i) When operating normally, calculate the resistance of one of the bulbs.
(ii) Calculate the effective resistance of the three bulbs.
(iii) What will be reading of the ammeter?
(iv) Draw a circuit diagram showing the three bulbs connected in such a way that they would all work at the same brightness especially if they are not identical.
Date posted:
August 6, 2019
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Answers (1)
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State two quantities that are used to determine whether accumulator require recharging or not.
(Solved)
State two quantities that are used to determine whether accumulator require recharging or not.
Date posted:
August 6, 2019
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Answers (1)
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State one advantage of using an optical fibre in communication.
(Solved)
State one advantage of using an optical fibre in communication.
Date posted:
August 6, 2019
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Answers (1)
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The figure below shows how the displacement varies for a certain wave.
Determine the frequency of the wave.
(Solved)
The figure below shows how the displacement varies for a certain wave.
Determine the frequency of the wave.
Date posted:
August 6, 2019
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Answers (1)
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Explain why soft iron keepers are suitable for storing magnets.
(Solved)
Explain why soft iron keepers are suitable for storing magnets.
Date posted:
August 6, 2019
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Answers (1)
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The figure below shows a ray of light incident on a plane mirror.
(Solved)
The figure below shows a ray of light incident on a plane mirror.
The plane mirror is then rotated clockwise through an angle of 200 keeping the incident ray
fixed. Determine the new angle of reflection.
Date posted:
August 6, 2019
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Answers (1)
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Explain why it is easier to loosen a tight nut using a spanner with long handle
(Solved)
Explain why it is easier to loosen a tight nut using a spanner with long handle
Date posted:
June 8, 2019
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Answers (1)
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State four significance of Karst regions.
(Solved)
State four significance of Karst regions.
Date posted:
June 4, 2019
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Answers (1)
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The figure below shows a pipe of varying cross-section. Three vertical tubes X, Y and Z of same diameter are fixed to the section A,...
(Solved)
The figure below shows a pipe of varying cross-section. Three vertical tubes X, Y and Z of same diameter are fixed to the section A, B and C of the pipe respectively as shown below.
Given that the water flows in the direction shown by the arrow, indicate on the diagram the relative levels of water in Y and Z.
Date posted:
June 4, 2019
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Answers (1)
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The densities of liquids may be measured using hydrometers. The
hydrometer in the Figure below consists of a weighted bulb with a thin stem , and...
(Solved)
The densities of liquids may be measured using hydrometers. The
hydrometer in the Figure below consists of a weighted bulb with a thin stem , and is floating to the depth shown when it is immersed in a liquid whose density is 0.8g/cm3.
The hydrometer has a mass of 165g and the stem has a uniform cross-sectional area of 0.75 cm2. Calculate;
I. the change in the submerged volume of the hydrometer when it is first placed in a liquid of density 1.00 g/cm3 and then in the liquid of density 1.25 g/cm3.
II. the distance on the stem between the 1.0 g/cm3 and 1.25 g/cm3 graduations.
Date posted:
June 4, 2019
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Answers (1)
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A bullet of mass 2g is fired horizontally into a block of wood of mass
498g. The block is suspended by a light inextensible string so...
(Solved)
A bullet of mass 2g is fired horizontally into a block of wood of mass
498g. The block is suspended by a light inextensible string so that it is able to move in a vertical plane. The block and the bullet move together through a vertical distance of 8.6cm as shown in figure below.
I. Calculate the change in gravitational potential energy of the block and bullet.
II. Calculate the initial velocity of the block and bullet after they start moving together.
III. Determine the speed of the bullet before the impact with the block.
Date posted:
June 4, 2019
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Answers (1)
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State the SI unit of momentum as used in Physics.
(Solved)
State the SI unit of momentum as used in Physics.
Date posted:
June 4, 2019
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Answers (1)
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The Figure below shows a velocity-time graph for a steel ball falling
through a viscous fluid.
Explain the nature of the curve in;
(i) section PQ.
(ii) section QR.
(iii)...
(Solved)
The Figure below shows a velocity-time graph for a steel ball falling
through a viscous fluid.
Explain the nature of the curve in;
(i) section PQ.
(ii) section QR.
(iii) If the graph shown above is of a ball falling through water, sketch on the same axis a graph for the ball falling through glycerine.
Date posted:
June 4, 2019
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Answers (1)
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The Figure 11 below shows a hydraulic lift supporting a load of 150kg. Its cross-sectional areas A1 and A2 are 0.02m2 and 0.4m2 respectively. The...
(Solved)
The Figure 11 below shows a hydraulic lift supporting a load of 150kg. Its cross-sectional areas A1 and A2 are 0.02m2 and 0.4m2 respectively. The length of the effort arm is 1m and the length of the plunger from the pivot is 0.4m.
Determine:
(i) the pressure exerted by 150kg mass.
(ii) the pressure exerted by F1 on the smaller piston.
(iii) the force F1.
(iv) the applied force, Fe.
(v) the mechanical advantage.
(vi) the velocity ratio of the system.
(v) the efficiency of the system.
Date posted:
June 4, 2019
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Answers (1)
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A stone of mass 0.5kg is attached to a string of length 0.5m which will break if the tension exceeds 20N. The stone is whirled...
(Solved)
A stone of mass 0.5kg is attached to a string of length 0.5m which will break if the tension exceeds 20N. The stone is whirled in a vertical plane, the axis of rotation being above the ground, as shown in the Figure below.
The angular velocity is gradually increased until the string breaks.
(a) In what position is the string most likely to break?
(b) At what angular velocity, w, will the string break?
Date posted:
June 4, 2019
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Answers (1)
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A stone is thrown with a horizontal velocity u from the top of a building of height 125m so as to hit a target on...
(Solved)
A stone is thrown with a horizontal velocity u from the top of a building of height 125m so as to hit a target on the ground 75m from the base of the building as shown in Figure below.
Calculate:
(i) the time taken for the stone to hit the target.
(ii) the horizontal velocity, u, of the stone.
Date posted:
June 4, 2019
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Answers (1)
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The Figure below shows a planet Venus orbiting the sun in a circular orbit
at constant speed.
(i) State what provides the centripetal force.
(ii) Indicate the...
(Solved)
The Figure below shows a planet Venus orbiting the sun in a circular orbit
at constant speed.
(i) State what provides the centripetal force.
(ii) Indicate the direction of centripetal force on the planet.
Date posted:
June 4, 2019
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Answers (1)