Class 11 Composition and Structure of Atmosphere worksheet

Sample questions

Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.

Section A · multiple choice

1. 1.

   About 99 per cent of the atmosphere’s mass lies within a height of:

   1. 120 km
   2. 400 km
   3. 8 km
   4. 32 km

   Answer

   (d) 32 km

2. 2.

   Which describes the stratosphere?

   1. the uppermost, very rarefied layer
   2. charged particles reflect radio waves back to the earth
   3. it contains the ozone layer
   4. temperature falls to minus 100 °C at about 80 km

   Answer

   (c) it contains the ozone layer

3. 3.

   What is the role of water vapour in the atmosphere?

   1. act as nuclei for condensation
   2. the life-giving gas for humans and animals
   3. the largest share of the air by volume
   4. keeps in the earth’s heat like a blanket

   Answer

   (d) keeps in the earth’s heat like a blanket

Section B · short answer

1. 4.

   What is the atmosphere?

   Answer

   A mixture of gases, water vapour and dust particles that envelops the earth.

2. 5.

   Give one feature of each layer: (a) troposphere (b) ionosphere

   Answer

   (a) all weather happens here and temperature falls with height (b) charged particles reflect radio waves back to the earth

Section C · long answer

1. 6.

   Describe the composition of the atmosphere.

   Answer

   Gases (mostly nitrogen and oxygen, with argon, carbon dioxide and others), water vapour up to 4 per cent, and dust particles; oxygen is negligible by 120 km and carbon dioxide and water vapour reach only 90 km.

Fresh sheets for your child

In the app, every Composition and Structure of Atmosphere sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.

Coming soon for Android and iPhone.

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