The temperature at which the water vapor in the air saturates the air and begins to condense is known as

• A. dew point
• B. critical point
• C. boiling point
• D. triple point

Refraction of lights differs from reflection in that, in refraction i. at least two media are involved ii. there is a change in the direction of the ray iii. the speed of the ray changes. Which of the statements above is/are correct?

• A. i only
• B. i ad ii only
• C. ii and iii only
• D. i and iii only

The change of state from solid to liquid occurs

• A. at constant temperature
• B. when temperature is lower than the boiling point
• C. when temperature is just near freezing point
• D. when temperature is equal to the boiling point

A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]

• A. 0.23hp
• B. 0.40hp
• C. 4.00hp
• D. 4.40hp

The diagram below represents the graph of electron energy against the frequency of the radiation incident on a metal surface. Interpret the: (a) slope of the graph; (b) intercept, OC; (c) intercept, OK.

Which of the following types of thermometers can be used to measure a range of temperature from -50°C to 50°C? i. Clinical ii. Mercury iii. Alcohol-in-glass

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

A tennis ball projected at an angle 0 attains a range R = 78. If the velocity imparted to the ball by the racket is 30 ms\(^{-1}\), calculate O. [ g = 10 ms\(^{-2}\)]

A quantity of water at 20^oC is mixed with another quantity of water at 70^oC. The final steady temperature of the mixture is 40^oC. Determine the ratio of the mass of the cold water to that of the hot water

• A. 7:2
• B. 3:2
• C. 2:5
• D. 1:2

Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equal resistance ii. Current is maximum iii. Reactance are maximum iv. Current and voltage are 90° out of phase

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

Alcohol of mass 21g and density 0.7g cm^-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm^-3]

• A. 0.775gcm^-3
• B. 0.875gcm^-3
• C. 0.780gcm^-3
• D. 0.880gcm^-3