Jagran Josh Logo

Go

CBSE Class 12th English (Core) Question Paper 2013 Set-3

 12-APR-2013

CBSE Class 12th English (Core) Question Paper (Set-3), given here

1. Air pollution is an issue which concerns us all alike. One can willingly choose or reject a food a drink or a life comfort but unfortunately there is little choice for the air we breathe. All what is there in air is inhaled by one and all living in those surroundings.

Get the solved paper for other subjects

2. Air pollutant is defined as a substance which is present while normally it is not there or present in an amount exceeding the normal concentrations. It could either be gaseous or a particulate matter. The important and harmful polluting gases are carbon monoxide carbon dioxide ozone and oxides of sulphur and nitrogen. The common particulate pollutants are the dusts of various inorganic or organic origins. Although we often talk of the outdoor air pollution caused by industrial and vehicular exhausts the indoor pollution may prove to be as or a more important cause of health problems.

To get the tips and strategies for science and mathematics, Click Here

3. Recognition of air pollution is relatively recent. It is not uncommon to experience a feeling of suffocation in a closed environment. It is often ascribed to the lack of oxygen. Fortunately however the composition of air is remarkably constant all over the world. There is about 79 per nitrogen and 21 per cent oxygen in the air-the other gases forming a very small fraction. It is true that carbon dioxide exhaled out of lungs may accumulate in a closed and over-crowded place. But such an increase is usually small and temporary unless the room is really air-tight. Exposure to poisonous gases such as carbon monoxide may occur in a closed room heated by burning coal inside. This may also prove to be fatal.

To get the complete study material, Click Here

4. What is more common in a poorly ventilated home is a vague constellation of symptoms described as the sick-building syndrome. It is characterized by a general feeling of malaise head-ache dizziness and irritation of mucous membranes. It may also be accompanied by nausea itching aches pains and depression. Sick building syndrome is getting commoner in big cities with the small houses which are generally over-famished. Some of the important pollutants whose indoor concentrations exceed those of the outdoors include gases such as carbon monoxide carbon dioxide oxides of nitrogen and organic substances like spores formaldehydes hydrocarbon aerosols and allergens. The sources are attributed to a variety of construction materials insulations furnishings adhesives cosmetics house dusts fungi and other indoor products.

To Get Complete Question, Click Here

By:Kanhaiya raghav | On:26-DEC-2013 21:05:16


Please english sample paper


By:meenakshi | On:21-NOV-2013 16:54:31


english sample paper class 12th


Jagran Josh Test Prep Centers:

Register to receive latest updates for FREE!

All Fields Mandatory
(Ex:9123456789)
Please Select Your Interest
By clicking on Submit button, you agree to our terms of use