If the cubic expansivity of brass between 27^oC and 100^oC is 5.7 x 10^-5K^-1, What is its linear expansivity?

• A. 2.85 x 10^-5K^-1
• B. 1.90 x 10^-5K^-1
• C. 1.86 x 10^-5K^-1
• D. 1.70 x 10^-5K^-1

The following devices use plane mirrors in their operations, except

• A. periscope
• B. sextant
• C. kaleidoscope
• D. binoculars

A metal of mass 0.5kg is heated to 100°C and then transferred to a well-lagged calorimeter of heat capacity 80J/K containing water of heat capacity 420J/K at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal.

• A. 877J/kg/k
• B. 286J/kg/k
• C. 133J/kg/k
• D. 92J/kg/k

An image formed on a screen is always?

• A. inverted
• B. magnified
• C. upright
• D. virtual

The particle and wave nature of matter are demonstrated in the equation

• A. λ = hc/E
• B. λ = h/P
• C. λ = c/f
• D. λ = 2 d sin θ

In doping an intrinsic semiconductor to produce a p-type semiconductor,

• A. the semiconductor is heated up
• B. a donor element is added
• C. an acceptor element is added
• D. the semiconductor is conducted to a battery

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340m/s, how far is he from the cliff?

• A. 680m
• B. 170m
• C. 34m
• D. 85m

Which of the following is not a conductor of electricity?

• A. Human body
• B. Glass
• C. Silver
• D. Earth

A ball thrown vertically upward reaches a maximum height of 50 m above the level of projection. Calculate the;

(i) time taken to reach the maximum height,

(ii) speed of the throw. [g = 10 ms\(^{-2}\)]

A particle is projected horizontally at 15ms\(^{-1}\) from a height of 20m.

Calculate the horizontal distance covered by the particle just before hitting the ground.

[g = 10 ms\(^{-2}\)]