a. Because petrol has a property of absorbing oxygen from water.

b. Because petrol is lighter than water.

c. Because petrol. is heavier than water.

d. Because petrol is highly inflammable.

a. its capacity to do work.

b. the rate at which a body can do work.

c. that property of the body which determines the effectiveness of a given force which is applied on the body.

d. a measure of the motion,of the body.

a. 1ecause the pendulum gains length in summer.

b. Because the pendulum loses length in summer.

c. Because days are longer in summer.

d. Because the dial of the clock expands in summer.

a. 7/10 of its total volume.

b. 8/10 of its total volume.

c. 9/10 of its total volume.

d. 1/2 of its total volume.

a. It increases.

b. It decreases.

c. It may or may not change.

d. It does not change.

a. 40 degree.

b. 39 degree.

c. 38 degree.

d. 37 degree.

a. Because the accumulation of steam in the pressure cooker increases pressure inside the cooker.

b. Because the accumulation of steam in the pressure cooker' increases the temperature inside the cooker.

c. Because the accumulation of steam in the pressure cooker increases both pressure and temperature inside the cooker.

d. Because of the increase in the penetrating power of the steam.

a. Because wind blows faster on warm days.

b. Because humidity is less on warm days.

c. Because high temperature of air fastens' evaporation.

d. ecause clothes expand on warm days. Thus more surface area is exposed.

a. 0 degree C.

b. 1 degreeC.

c. 2 degreeC.

d. 4 degreeC.

a. Because ice is cooler than water.

b. Because water exerts an upward pressure on the ice.

c. Because the surface of water behaves like a stretched membrane.

d. Because the density of ice is less than that of water.