Exercise

Author:Dr. Yogita Gupta & Deepika Sharma

Dr. Yogita Gupta Science Solutions for Exercise

Simple step-by-step solutions to Exercise questions of Combustion and Flame from Focus Science in Everyday Life. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.

Questions from Exercise with Hints & Solutions

EASY
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 1

Give three conditions which are necessary for combustion.

EASY
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 2

What is ignition temperature?

MEDIUM
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 3

Differentiate between luminous and non-luminous zones.

EASY
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 4

What do you understand by the calorific value of a fuel?

EASY
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 5

What causes acid rain?

HARD
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 3

How are fuels classified on the basis of their physical state? Give at least two examples of each.

HARD
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Exercise>Q 4

What are the characteristics of a good fuel?

MEDIUM
8th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Combustion and Flame>Train Your Brain>Q 3

Hydrogen gas has high calorific value but it is not widely used as a fuel. Why?