Question

Fill in the blanks in the following sentences.
(a) A ____________ process in which a substance reacts with
__________ to give off heat is called combustion.
(b) When the clothes of a person catch __________, the person is
covered with a __________ to extinguish fire.
(c) The __________ temperature at which a substance catches
fire is called its __________ temperature.
(d) The substances which have very ________________ ignition
temperature and can easily catch fire with a flame are called
__________ substances.
(e) The substances which vapourise during __________, give flame.


NCERT Class VIII
Science - Exemplar Problems

Chapter 6. Combustion and Flame

Answer 1

(a) physical, oxygen
(b) fire, blanket
(c) lowest, ignition
(d) low, inflammable
(e) burning

Answer 2

Answer:

A physical process in which a substance reacts with

oxygen to give off heat is called combustion.

(b) When the clothes of a person catch  

fire, the person is  covered with a blanket to extinguish fire.

(c) The lowest temperature at which a substance catches

fire is called its ignition   temperature.

(d) The substances which have very low ignition

temperature and can easily catch fire with a flame are called  inflammable substances.

(e) The substances which vaporize during burning , give flame.