sources of energy and combustion for D.A.V. class 8

energy is the................

• capacity to rest

• capacity to do work

• capacity to play games

• all of these

-------- is inter-convertible.

• heat

• energy

• temperature

• pressure

substance which produce heat on burning in air is called------

• a)combustible substance

• b) wood and coal

• c) fuel

• both b and c

sources of energy are classify on the basis of

• occurrence

• physical state

• availability

• all of these

------ is synthetic sources of energy.

• solar energy

• wind energy

• chemical energy

• hydro energy

petroleum example of liquid fuel

• yes

• no

• may be

• may be not

________ are inexhaustible natural resources.

• coal

• wind

• both

• none

non-renewable sources of energy are

• exhaustible

• inexhaustible

• both

• none

wood is fossil fuel.

• true

• false

• may be

quality of carbon monoxide is________________

• undesirable

• irritating

• dangerous

• all