A plane inclined at 30° to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly upn the plane

• A. 50.0N
• B. 120.0N
• C. 200.0N
• D. 240N

The pressure of a fixed mass of an ideal gas at 27°C is 3 pa. The gas is heated at a constant volume until its pressure is 5 pa. Determine the new temperature of the gas.

• A. 100^oC
• B. 227^oC
• C. 273^oC
• D. 500^oC

Mechanical energy can be either

• A. kinetic or electric
• B. white surface
• C. black surface
• D. electric or heat

A body of mass 200g and specific heat capacity 0.4Jg^-1k^-1 cools from 37^oC to 31^oC. Calculate the quantity of the heat released by the body.

• A. 4800J
• B. 1200J
• C. 480J
• D. 202J

A wire of length 5.0 m and diameter 2.0 mm extends by 0.25 mm when a force of 50 N was used to stretch it from its end. Calculate the;

(a) stress on the wire;

(b) strain in, the wire. [\(\pi = 3.142\)]

The ice and steam point on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in decree Celsius when the mercury meniscus is the 14cm mark

• A. 20^oC
• B. 30^oC
• C. 34^oC
• D. 70^oC

State;

(a) the difference between plane polarized light and ordinary light;

(b) two uses of polaroids

A cube made of metal of linear expansivity \(\alpha\) is heated through a temperature \(\theta\). If the initial volume of the cube is V_o, the correct expression for the increase in volume of the cube is

• A. \(\frac{1}{3} \alpha V_o \theta\)
• B. \(\frac{1}{2} \alpha V_o \theta\)
• C. \(2 \alpha V_o \theta\)
• D. \(3 \alpha V_o \theta\)

A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated

• A. 320J
• B. 400J
• C. 10800J
• D. 72000J

A body accelerates uniformly from rest at 2ms^-2. Calculate the magnitude of its velocity after travelling 9m

• A. 4.5 ms^-1
• B. 6.0ms^-1
• C. 18.0^-1
• D. 36.0^-1