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- The stability of a body can be increased by increasing the base area and lowering its centre of gravity. State one way of lowering its...(Solved)
The stability of a body can be increased by increasing the base area and lowering its centre of gravity. State one way of lowering its centre of gravity.
Date posted: September 27, 2019. Answers (1)
- A steel sphere released in a tall transparent water jar attains a constant velocity after a while. The same sphere released in air falls at...(Solved)
A steel sphere released in a tall transparent water jar attains a constant velocity after a while. The same sphere released in air falls at a constant acceleration. Explain with a reason the difference in its motion in water and in air
Date posted: September 27, 2019. Answers (1)
- A transformer with 6000 turns in the primary circuit and 300 turns in the secondary circuit has its primary circuit connected to a 400V a.c....(Solved)
A transformer with 6000 turns in the primary circuit and 300 turns in the secondary circuit has its primary circuit connected to a 400V a.c. source. A heater connected to the secondary circuit produces heat at the rate of 600W. Assuming that the transformer is 100% efficient determine:-
i). The voltage in the secondary circuit.
ii). The current in the primary circuit.
iii). The current in the secondary circuit.
Date posted: September 27, 2019. Answers (1)
- The figure below shows two adjacent solids of materials Diamond and Ruby.(Solved)
The figure below shows two adjacent solids of materials Diamond and Ruby.
The refractive index of Diamond is 2.4 and that of Ruby is 1.75.
(i) Find the refractive index of Ruby with respect to diamond.
(ii) Draw an accurate ray from diamond such that no light is incident on the screen.
Date posted: September 27, 2019. Answers (1)
- Refraction is the bending of light as it travels from one media to another. State the cause of the bending.(Solved)
Refraction is the bending of light as it travels from one media to another. State the cause of the bending.
Date posted: September 27, 2019. Answers (1)
- The maximum Kinetic energy of the electrons emitted from a metallic surface is 1.6 x 10-19J when the incident radiation is 7.5 x 1014Hz. Calculate...(Solved)
The maximum Kinetic energy of the electrons emitted from a metallic surface is 1.6 x 10-19J when the incident radiation is 7.5 x 1014Hz. Calculate the minimum frequency of radiation for which electrons will be emitted.(A planck’s constant = 6.6 x 10-34Js)
Date posted: September 27, 2019. Answers (1)
- The figure below shows the features of a Geiger-Muller (G.M) Tube used for detecting radiation.(Solved)
The figure below shows the features of a Geiger-Muller (G.M) Tube used for detecting radiation.
(i) State the use of Argon gas and Bromine.
Argon gas
Bromine
(ii) Explain how radiation from the source is detected by the tube.
(iii) State one use of radio activity in medicine.
Date posted: September 27, 2019. Answers (1)
- The figure below shows an experimental set up in a vacuum for investigating the effect of a magnetic field on the radiation emitted by a...(Solved)
The figure below shows an experimental set up in a vacuum for investigating the effect of a magnetic field on the radiation emitted by a radio-active source.
The background radiation at the place is 5 counts per minute. The detectors are placed a positions A, B and C respectively. Results obtained are shown in the table below.
Use the table to explain which of the three types of radiations are emitted from the source.
Date posted: September 27, 2019. Answers (1)
- Study the figure below and use it to answer questions that follow.(Solved)
Study the figure below and use it to answer questions that follow.
(i) Briefly explain how the circuit works to produce a rectified alternating current.
(ii) Draw on the diagram to show the position of the capacitor.
(iii) State the functions of the capacitor in the circuit.
(iv) Sketch the graph of the output as seen on a CRO screen.
Date posted: September 27, 2019. Answers (1)
- Define the term acceptor atoms as applied in semiconductor.(Solved)
Define the term acceptor atoms as applied in semiconductor.
Date posted: September 27, 2019. Answers (1)
- Sketch a circuit diagram that can be used to investigate p-n junction diode characteristics.(Solved)
Sketch a circuit diagram that can be used to investigate p-n junction diode characteristics.
Date posted: September 27, 2019. Answers (1)
- State the meaning of the statement diode characteristic curve.(Solved)
State the meaning of the statement diode characteristic curve.
Date posted: September 27, 2019. Answers (1)
- The figure below shows an experimental arrangement. S1 and S2 are narrow slits.(Solved)
The figure below shows an experimental arrangement. S1 and S2 are narrow slits.
State what is observed on the screen when the source is:
(i) Monochromatic
(ii) White light
Date posted: September 27, 2019. Answers (1)
- An observer watching a fireworks displays sees the light from an explosion and hears the sound 4 seconds later. How far was the explosion from...(Solved)
An observer watching a fireworks displays sees the light from an explosion and hears the sound 4 seconds later. How far was the explosion from the observer? (Speed of sound in air 330m/s).
Date posted: September 27, 2019. Answers (1)
- A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The...(Solved)
A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The distance from the centre of the table to the block is 15cm. If the maximum tension the thread can withstand is 5.6N, determine the maximum angular velocity the table can attain before the thread cuts.
Date posted: September 27, 2019. Answers (1)
- The figure below shows a metal rod AB of length 2m horizontally balanced while supported by a pivot and a string.(Solved)
The figure below shows a metal rod AB of length 2m horizontally balanced while supported by a pivot and a string.
Determine the mass of the metal rod if the tension is 15N.
Date posted: September 27, 2019. Answers (1)
- A block of wood of mass 80kg floats in water with 0.6 of its volume in water. Calculate the number of rods each 20g that...(Solved)
A block of wood of mass 80kg floats in water with 0.6 of its volume in water. Calculate the number of rods each 20g that can be placed on the block so that its top is level with the surface of water.
Date posted: September 27, 2019. Answers (1)
- Calculate the total power in lifting 0.2kg of metal cane containing 2000cm3 of ice onto a lorry as shown below within 4s. (SI Q =...(Solved)
Calculate the total power in lifting 0.2kg of metal cane containing 2000cm3 of ice onto a lorry as shown below within 4s. (SI Q = 0.9g/cm3)
Date posted: September 27, 2019. Answers (1)
- The figure below shows four equivalent springs with negligible weight, the weight of the rod R is 20N. Given that the spring constant is 5N/m....(Solved)
The figure below shows four equivalent springs with negligible weight, the weight of the rod R is 20N. Given that the spring constant is 5N/m. Calculate the load L which causes an extension of 28m to the system.
Date posted: September 27, 2019. Answers (1)
- State any two possible ways of increasing velocity ratio of wheel and axle.(Solved)
State any two possible ways of increasing velocity ratio of wheel and axle.
Date posted: September 27, 2019. Answers (1)