An aluminium rod of length 1.8m at 10°C is heated to proceed produce a difference in length of 0.007m. Calculate the temperature to which it is heated. (Linear expansivity of aluminium = 2.3 x 10\(^{-5}\)K\(^{-1}\)

• A. 155^oC
• B. 160^oC
• C. 169^oC
• D. 179^oC

Total internal reflection. i. is a phenomenon of refraction of light. ii. occurs when light rays travel into a denser medium. iii. occurs when the critical angle is just exceeded. iv. is a phenomenon of reflection of light. Which of the statements above are correct?

• A. i and ii only
• B. i and iii only
• C. i, ii and iii only
• D. i, iii and iv only

A mercury-in-glass thermometer read 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm

• A. 13^oC
• B. 20^oC
• C. 33^oC
• D. 38^oC

The distance between two successive trough of a wave is 0.4m. If the frequency of the source is 825Hz, Calculate the speed of the wave

• A. 165.0 ms^-1
• B. 330.0ms^-1
• C. 41.5ms^-1
• D. 85.0ms^-1

The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures

• A. continuous dissipation of heat to the room
• B. uniform distribution of thermal energy to all parts of the mixture
• C. that the thermal energy is confined to the mixture
• D. that there is rapid heat exchange

A projectile is fired with a velocity of 20 ms\(^{-1}\) at an angle of 40° to the horizontal. Determine the components of the velocity of the projectile at its maximum height.

A pressurized perfume bottle is left on the window pane of a room. What happens to he gas molecules of the perfume on a sunny day? They

• A. expand
• B. collide less often
• C. move more rapidly
• D. contract

Resonance occurs when one vibrating object causes a second object to vibrate at its own natural

• A. amplitude
• B. speed
• C. frequency
• D. intensity

The electricity meters in houses measure energy unit consumed in

• A. kilowatt-hour
• B. volt
• C. ampere
• D. coulomb