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Explain why when graduating the upper fixed point of a thermometer; the bulb is put in steam
above boiling water and not boiling water.
(Solved)
Explain why when graduating the upper fixed point of a thermometer; the bulb is put in steam
above boiling water and not boiling water.
Date posted:
August 6, 2019
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Answers (1)
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The figure below shows a soap film formed on a metal ring and a loop of thread inside it.
(i) Explain what will happen when the...
(Solved)
The figure below shows a soap film formed on a metal ring and a loop of thread inside it.
(i) Explain what will happen when the film is punctured by a needle at X.
(ii) What is the name given to the force acting on the thread?
Date posted:
August 6, 2019
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Answers (1)
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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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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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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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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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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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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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The bicycle pump shown in Figure below is one of the applications of pressure in
gases.
Explain how the leather washer functions during;
(a) backstroke
(b) forward stroke
(Solved)
The bicycle pump shown in Figure below is one of the applications of pressure in
gases.
Explain how the leather washer functions during;
(a) backstroke
(b) forward stroke
Date posted:
June 4, 2019
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Answers (1)
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A smooth wooden plane is inclined at an angle of 300 to the horizontal as shown in Figure 5 below. An object of mass 10kg...
(Solved)
A smooth wooden plane is inclined at an angle of 300 to the horizontal as shown in Figure 5 below. An object of mass 10kg is pulled steadily up the plane by a force of 60N. Determine;
(a) the velocity ratio of the inclined plane.
(b) efficiency of the system.
Date posted:
June 4, 2019
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Answers (1)
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An immersion heater consumes a voltage of 240V and a current of 10A. If it is used to heat 5kg of water at 200C, find...
(Solved)
An immersion heater consumes a voltage of 240V and a current of 10A. If it is used to heat 5kg of water at 200C, find the final temperature of water after 7 minutes. (Take the specific heat capacity of water = 4200 J/kgk)
Date posted:
June 4, 2019
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Answers (1)
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A student observed some pollen grains on the surface of water in a beaker with the
help of hand lens as shown below.
(a) State the observation...
(Solved)
A student observed some pollen grains on the surface of water in a beaker with the
help of hand lens as shown below.
(a) State the observation made.
(b) Explain the observation in (a) above.
(c) What conclusion can be drawn from the above experiment.
Date posted:
June 4, 2019
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Answers (1)
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The figure below shows a ray of light incident at an angle of 35.60 at point D on the first face of a glass prism...
(Solved)
The figure below shows a ray of light incident at an angle of 35.60 at point D on the first face of a glass prism ABC. The refractive index of the prism is 1.6.
(i) Determine the angle of refraction at point D.
(ii) Find the angle of incidence of the refracted ray on the face AC to 1 decimal point.
(iii) Complete the ray diagram to show the emergent ray from the face AC.
(iv) State two conditions necessary for total internal reflection to occur.
Date posted:
June 3, 2019
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Answers (1)
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An object of height 10.5cm stands before a diverging lens of focal length 20cm and a distance of 10cm from the lens. Determine;
(i) image distance....
(Solved)
An object of height 10.5cm stands before a diverging lens of focal length 20cm and a distance of 10cm from the lens. Determine;
(i) image distance.
(ii) height of the image.
(iii) magnification.
Date posted:
June 3, 2019
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Answers (1)
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The graph below show stopping potential Vs against frequency f. (Take C = 3.0 x 108ms¯¹).
Use the graph to determine:-
(i) the threshold wavelength.
(ii) Planck’s...
(Solved)
The graph below show stopping potential Vs against frequency f. (Take C = 3.0 x 108msˉ¹).
Use the graph to determine:-
(i) the threshold wavelength.
(ii) Planck’s constant.
(iii) the work function of the metal.
Date posted:
June 3, 2019
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Answers (1)
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The diagram below shows a simplified hydraulic braking system of a car.
(i) State the property of the liquid (oil) that makes its more suitable than...
(Solved)
The diagram below shows a simplified hydraulic braking system of a car.
(i) State the property of the liquid (oil) that makes its more suitable than a gas for use as a brake fluid.
(ii) Explain how the system works starting from when the driver presses the foot pedal.
Date posted:
June 3, 2019
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Answers (1)
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Explain how a person is able to draw milk from a glass using a straw.
(Solved)
Explain how a person is able to draw milk from a glass using a straw.
Date posted:
June 3, 2019
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Answers (1)
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The following figure shows a wheel and axle used to raise a load W by applying an effort F. The radius of the larger wheel...
(Solved)
The following figure shows a wheel and axle used to raise a load W by applying an effort F. The radius of the larger wheel is R and the small wheel is y.
Given that v = 5cm and R is 8cm, determine the effort required to raise a load of 20N if the efficiency of the system is 80%.
Date posted:
June 3, 2019
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Answers (1)