SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Write any two preventive measures for global warming.

Write the preventive measures to control the effect of global warming.

Vermiwash is used as a ______ for crops.

______ can be used for seed treatment.

What is Panchgavya?

State the law of conservation of mass.

Match the following.

Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?

Name the four laws of chemical combinations.

______ source of bio-fertilizers.

Match the following:

What is bio-control?

What are bio-pesticides?

What are the effects of acid rain? How can we prevent them?

The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of ______.

In water, hydrogen and oxygen are combined in the ratio of _____ by mass.

State the law of constant proportions.

Ruthresh, Hari, Kanishka, and Thahera collected different samples of water from a well, a pond, a river, and underground water. All these samples were sent to a testing laboratory. The test result showed the ratio of hydrogen to oxygen as 1:8.

1. What conclusion would you draw from the above experiment?
2. Which law of chemical combination does it obey?

Name the microbe which converts atmospheric nitrogen directly into soluble nitrogen compounds.

Write any two preventive measures for acid rain.