English Medium कक्षा १० - CBSE Question Bank Solutions

Give reason why the carbon compounds do not conduct electricity in the molten state.

Which radiations are absorbed by ozone layer?

Name the group of chemical compounds which damages the ozone layer.

Write the full name of CFC.

Fill in the following blank with suitable word :

Ultraviolet rays can cause skin..............

Give one harmful effect of CFC.

Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.

What are the causes of depletion of ozone layer?

With the help of a flow diagram, describe how energy from the sun flows through various trophic levels.

What is ozone? 

How Ozone is Formed?

How does ozone layer protect us from harmful effects in the environment?

What is UNEP?

What step has been taken by UNEP in 1987 to prevent too much damage to the ozone layer?

Which pollutant released into the air during refrigeration and airconditioning is the greatest contributor to the depletion of ozone layer?
(a) BHC
(b) DDT
(c) CFC
(d) UNEP

The depletion of ozone layer in the upper atmosphere is mainly due to the emission of :
(a) unburnt hydrocarbons
(b) chlorofluorocarbons
(c) greenhouse gases
(d) ultraviolet radiations

The excessive exposure of humans to ultraviolet rays results in:

1. damage to immune system
2. damage to lungs
3. skin cancer
4. peptic ulcers

O₂ is converted into O₃ by the action of :
(a) infrared radiations
(b) ultraviolet radiations
(c) gamma radiations
(d) cosmic radiations