Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To

• A. increase the intensity of sound waves
• B. increases the loudness of the sound waves
• C. reduce the effect of revibration of sound waves
• D. decreases thr frequency of sound waves

Which of the following source of energy is renewable?

• A. petroleum
• B. charcoal
• C. hydro
• D. nuclear

Power supply is transmitted at a very high voltage and low current in order to

• A) make pass through the trasformers
• B) increase the power supply
• C) make it travel fast
• D) prevent overheating of the coil

If tension is maintained on a stretched string of length 0.6m, such that its fundamental frequency of 220Hz is excited, determine the velocity of the transverse wave in the string.

• A. 528 ms-1
• B. 264 ms-1
• C. 132 ms-1
• D. 66 ms-1

The electrolyte in the Nickei-iron (Nife) accumulator is

• A) potassium hydroxide solution
• B) dilute tetraoxosulphate(VI)acid
• C) copper tetraoxosulphate(VI)solution
• D) ammonium chloride solution

Which of the following pairs of physical quantities is made up of vectors?

• A. speed and displacement
• B. mass and force
• C. dislacement and acceleration
• D. momentum and length

The electrical energy supplied by a Leclanche cell is obtained from the

• A. Nuclear energy
• B. Magnetic energy
• C. Solar energy
• D. Chemical energy

Which of the following is a unit of the time rate of flow of electric charges?

• A. coulomb
• B. ampere
• C. volt
• D. watt

A boy travels 8 km eastward to a point B and then 6km northward to another point C. Determine the difference between the magnitude of displacement of the boy and distance travelled by him

• A. 2.0km
• B. 4.0km
• C. 10.0km
• D. 13.0km

A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera

• A. 0.18m
• B. 0.50m
• C. 1.62m
• D. 18.00m