The earpiece of a telephone handset converts energy from

• A. electrical to sound
• B. sound to electrical
• C. sound to electrical
• D. sound to radio wave

The components of vectors Q and R are (-3.0, 5.5) and (9.2, 4.4) respectively. Determine the components of Q + R.

• A. (3.7, 7.4)
• B. (6.2, 9.9)
• C. (2.5, -4 .8).
• D. (14.7, 1.4)

I. Jet propelled aircraft

II. Rocket propulsion

III. The recoil of a gun

IV. A person walking

Which of the above is based on Newton's third law of motion

• A. I and II only
• B. I, II, III, and IV only
• C. I and III only
• D. I, II and III only

A planet has mass m₁ and is at a distance r, from the sun. A second planet has mass m₂ = 10m₁ and at a distance of r₂ = 2r₁ from the sun. Determine the ratio of the gravitational force experienced by the planets.

• A.1 : 5
• B.2 : 5
• C.3 : 5
• D.4 : 5

A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days?

• A) 1/32
• B) 1/16
• C) 1/ 8
• D) 1/4

The phenomenon of radioactivity was first discovered by

• A. Marie Curve
• B. Sir J.J Thomson
• C. Henn Becquerel
• D. Niels Bohr

Two similar cells are used to light two similar lamps as illustrated in the diagrams below. In which of the circuit diagrams are the lamps brightest?

• A. P
• B. Q
• C. R
• D. S

Which of the following devices is used to determine the relative density of an acid?

• A. manometer
• B. hydrometer
• C. hypsometer
• D. hygrometer

A piece of substance of specific head capacity 450JKg^-1K^-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms^-2]

• A. 2/9℃
• B. 4/9℃
• C. 9/4℃
• D. 9/2℃

For a pear-shaped conductor shown below, the concentration of charge on the outside is highest at?

• A. X
• B. Z
• C. Y
• D. K