Revision on Science

1. ……………. is the force with which all objects are attracted to the Earth.

• a. Mass

• b. Weight

• c Volume

The rapid combination between oxygen and elements producing heat and light is called ………………..

• respiration.

• burning.

• oxidation.

…………….. gas is used in making bread and dough.

• a. Carbon dioxide

• b. Oxygen

• c. Nitrogen

An object whose weight is 400 Newton on the Earth , so its mass equals……………….

• a. 40 kg.

• b. 40 g.

• c. 400 kg.

Legumes as clover benefit from nitrogen in formation of

• a. fats.

• b. carbohydrates.

• c. proteins.

You feel hot on touching a hot cup of tea because the temperature of the cup is ................ that of your hand.

• a. more than

• b. less than

• c. (a) & (b) are correct

The spring scale is used to measure the object's mass.

• True.

• False.

Oxygen gas doesn't burn but helps in burning

• True

• False.

The medulla oblongata controls the voluntary movements

• True

• False

Oxygen gas is collected by the downward displacement of water.

• True

• False