2013 - JAMB Physics Past Questions and Answers - page 2

What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

Calculate the work done when a force of 20N stretches a spring by 50mm.

At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? Density of sea water = 1013kg^-3, one atmosphere = 0.01 x 10⁵Nm^-2, g = 10ms^-2

What volume of alcohol will have same mass as 4.2m^-3 of petrol?

Density of alcohol = 8.4 x 10²kgm^-3, density of petrol =7.2x10³kgm^-3

Calculate the length which corresponds to a temperature of 20^oC if the ice and steam points of an unguarded thermometer are 400 mm apart

A wire of length 100.0m at 30^o has linear expansive of 2x10^-5K^-1 Calculate the length of the wire at a temperature of - 10^oC

A gas at a pressure of 10⁵Nm^-2expands from 0.6m^-3 to 1.2m³ at constant temperature, the work done is

Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is

Food cook quicker in salt water than in pure water because of the effect of

Steam from boiling water causes more damage on the skin than does boiling water because