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- The figure below shows wave fronts approaching a concave sphere.
Complete the diagram to show wave fronts formed after striking the surface. Show how focal point...(Solved)
The figure below shows wave fronts approaching a concave sphere.
Complete the diagram to show wave fronts formed after striking the surface. Show how focal point of the surface is located.
Date posted: May 31, 2019. Answers (1)
- The figure below shows a displacement time graph for a wave motion.
What is the frequency of the wave?(Solved)
The figure below shows a displacement time graph for a wave motion.
What is the frequency of the wave?
Date posted: May 31, 2019. Answers (1)
- The figure below shows a diagram of a current -carrying wire wound on a U-shaped soft iron.
Draw the magnetic field pattern around P and Q.(Solved)
The figure below shows a diagram of a current -carrying wire wound on a U-shaped soft iron.
Draw the magnetic field pattern around P and Q.
Date posted: May 31, 2019. Answers (1)
- The plates of a simple cell are connected through a torch bulb and then dipped into dilute sulphuric acid on a beaker. The
bulb lights brightly...(Solved)
The plates of a simple cell are connected through a torch bulb and then dipped into dilute sulphuric acid on a beaker. The
bulb lights brightly for a short time. State two possible causes of this.
Date posted: May 31, 2019. Answers (1)
- The coil of an electric motor is usually wound on a soft iron armature. State two purposes of this armature.(Solved)
The coil of an electric motor is usually wound on a soft iron armature. State two purposes of this armature.
Date posted: May 31, 2019. Answers (1)
- A boy observes his face in a concave mirror of focal length 100cm. If the mirror is 80cm away, state one characteristic of the image...(Solved)
A boy observes his face in a concave mirror of focal length 100cm. If the mirror is 80cm away, state one characteristic of the image observed.
Date posted: May 31, 2019. Answers (1)
- The figure below shows the image behind a mirror M.
By ray diagram construction, locate the position of the object.(Solved)
The figure below shows the image behind a mirror M.
By ray diagram construction, locate the position of the object.
Date posted: May 31, 2019. Answers (1)
- Explain why a body moving in horizontal circular motion does no work.(Solved)
Explain why a body moving in horizontal circular motion does no work.
Date posted: May 31, 2019. Answers (1)
- A transformer has 800 turn in the primary and 40 turns in the secondary winding. The alternating
e.m.f connected to the primary is 240v and the...(Solved)
A transformer has 800 turn in the primary and 40 turns in the secondary winding. The alternating
e.m.f connected to the primary is 240v and the current is 0.5A.
Determine
i) The secondary e.m.f
ii) The power in the secondary if the transformer is 95% efficient.
Date posted: May 31, 2019. Answers (1)
- A bar magnet is moved into a coil of insulated copper wire connected to a centre-zero galvanometer as shown in figure below.
i) Show on the...(Solved)
A bar magnet is moved into a coil of insulated copper wire connected to a centre-zero galvanometer as shown in figure below.
i) Show on the diagram the direction of induced current in the coil.
ii) State and explain clearly what is observed on the galvanometer when the magnet is moved into and then withdrawn from the coil.
Date posted: May 31, 2019. Answers (1)
- A pendulum bob is raised to a height of 60cm above its lowest point and made to swing as shown in the figure.
Determine the velocity...(Solved)
A pendulum bob is raised to a height of 60cm above its lowest point and made to swing as shown in the figure.
Determine the velocity of the mass at the height where kinetic energy is equal to the potential energy.
Date posted: May 31, 2019. Answers (1)
- Figure below shows two rays of monochromatic light incident on two adjacent slits S1 and S2
State what is observed on the screen when the:
i) Distance...(Solved)
Figure below shows two rays of monochromatic light incident on two adjacent slits S1 and S2
State what is observed on the screen when the:
i) Distance X is increased.
ii) Slit separation, d is reduced.
iii) White light is used.
Date posted: May 31, 2019. Answers (1)
- The wave shown in figure below has a velocity of 200m/s
Determine
i) The period T of the wave
ii) The frequency of the wave.
iii)...(Solved)
The wave shown in figure below has a velocity of 200m/s
Determine
i) The period T of the wave
ii) The frequency of the wave.
iii) The wavelength of the wave.
Date posted: May 31, 2019. Answers (1)
- The figure below shows a pulley system being used to raise a load.
Given that the size of the load is 500N and the effort applied...(Solved)
The figure below shows a pulley system being used to raise a load.
Given that the size of the load is 500N and the effort applied is 200N, calculate the efficiency of the machine.
Date posted: May 31, 2019. Answers (1)
- Figure below shows an isolated positive point charge P
On the figure, sketch the electric field pattern around the charge.(Solved)
Figure below shows an isolated positive point charge P
On the figure, sketch the electric field pattern around the charge.
Date posted: May 31, 2019. Answers (1)
- A 200g mass of copper was heated to 100°C and then transferred to a lagged copper calorimeter of mass 5g containing 125g of water at...(Solved)
A 200g mass of copper was heated to 100°C and then transferred to a lagged copper calorimeter of mass 5g containing 125g of water at 30°C. Calculate the final temperature of water. (Specific heat capacity of copper = 400J/KgK, water =4200J/KgK).
Date posted: May 31, 2019. Answers (1)
- Figure below shows an object placed 5cm in front of a convex lens whose focus length is 10cm.
a) On the same figure, draw a ray...(Solved)
Figure below shows an object placed 5cm in front of a convex lens whose focus length is 10cm.
a) On the same figure, draw a ray diagram to show the position of the image formed.
b) Use the ray diagram to determine
i) The image distance
ii) The image size
iii) The magnification
Date posted: May 31, 2019. Answers (1)
- The graph below shows how temperature of a 40kg of a substance varied with time as it was heated steadily by electrical
means. The heating coil...(Solved)
The graph below shows how temperature of a 40kg of a substance varied with time as it was heated steadily by electrical
means. The heating coil carried a current of 16A at a potential difference of 22V.
i) What is happening to the substance at AB?
ii) Determine the specific heat capacity of the substance in solid state.
Date posted: May 31, 2019. Answers (1)
- The figure (a) below shows a distance -time graph of a motion of a body.In the figure (b), sketch the corresponding velocity-time graph for the...(Solved)
The figure (a) below shows a distance -time graph of a motion of a body.In the figure (b), sketch the corresponding velocity-time graph for the same motion.
Date posted: May 31, 2019. Answers (1)
- The figure below shows a block diagram of a p-n junction diode.
On the same diagram, show how a cell may be connected so that it...(Solved)
The figure below shows a block diagram of a p-n junction diode.
On the same diagram, show how a cell may be connected so that it is reverse biased.
Date posted: May 31, 2019. Answers (1)