Secondary School (English Medium) (5 to 8) कक्षा ८ - CBSE Question Bank Solutions for Science

Suggest a suitable word for the following statement.

Nitrogen-fixing microorganism present in the root nodules of legumes

Which is a thermosetting plastic?

The material which is commonly used for making kitchen containers is ______.

Plastic articles are available in all possible shapes and sizes. Can you tell why?

PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?

A plastic used for making crockery is ______.

Unscramble the jumbled word given below, related to synthetic material.

Laspict

Which of the following non-metals reacts and catches fire on exposure to air?

Iron is more reactive than copper. Can you write an activity to show this?

Which of the following is not a constituent of petroleum?

Petroleum was formed from organisms

You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

Name the petroleum product used as fuel for stoves, lamps and jet aircrafts.

Petroleum, ______ and ______ are fossil fuels. 

The underlined word in the following sentence have been jumbled up. Write them in their correct form.

Umpetlore is a fossil fuel.

The underlined word in the following sentence have been jumbled up. Write them in their correct form.

Keenrose is a fuel used in jet crafts. 

Coal and petroleum are formed from the dead remains of organisms and are known as ______.

Excessive burning of fossil fuels is a major cause of ______.

We say fossil fuels will last only for a few hundred years. Comment.

We read in newspapers that burning of fuels is a major cause of global warming. Explain why.