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Recent questions and answers in Class 8

Questions >> Olympiad-Science >> Class 8

When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

answered Apr 7, 2019 by abin2242

2 answers

Polycot is obtained by mixing

answered Feb 2, 2019 by jagdishbodade15

2 answers

Molarity of solution which contains $40\; g$ urea dissolved in $500cm^3$ is

answered May 17, 2018 by sharmaaparna1

1 answer

An element X has valency equal to 3. What will be its formula with carbonate ions?

answered May 9, 2018 by sharmaaparna1

1 answer

When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:

answered May 8, 2018 by sharmaaparna1

1 answer

Nitrous oxide, commonly called laughing gas, has been a matter of concern to environmentalists recently because

answered May 7, 2018 by sharmaaparna1

1 answer

The word atom is from a Greek word meaning:

answered May 7, 2018 by sharmaaparna1

1 answer

Which of the following alloys is used for making magnets ?

answered May 7, 2018 by sharmaaparna1

1 answer

Polythene and PVC are examples of

answered May 7, 2018 by sharmaaparna1

1 answer

Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called

answered May 7, 2018 by sharmaaparna1

1 answer

Choose the correct statement about inflammable substances from the following. They have:

answered May 7, 2018 by sharmaaparna1

1 answer

Which non metal is essential for our life and inhale during breathing?

answered May 7, 2018 by sharmaaparna1

1 answer

The fibres manufacture by petrochemicals are

answered May 7, 2018 by sharmaaparna1

1 answer

Smog =

answered May 7, 2018 by sharmaaparna1

1 answer

Carbon monoxide in vehicle exhaust causes

answered May 7, 2018 by sharmaaparna1

1 answer

The presence of which of the following salts in water causes corrosion in steam boilers ?

answered May 7, 2018 by sharmaaparna1

1 answer

During electrolysis of water, oxygen gas is deposited at which electrode?

answered May 7, 2018 by sharmaaparna1

1 answer

Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?

answered May 7, 2018 by sharmaaparna1

1 answer

Which of the following groups contain all synthetic substances?

answered May 7, 2018 by sharmaaparna1

1 answer

What compound is a common component of air pollution, but is essential in the upper atmosphere to protect life on earth?

answered May 7, 2018 by sharmaaparna1

1 answer

Shyam’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

answered May 7, 2018 by sharmaaparna1

1 answer

When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of

answered May 7, 2018 by sharmaaparna1

1 answer

Choose the incorrect statement from the following. Forest fires are usually due to:

answered May 7, 2018 by sharmaaparna1

1 answer

Dead organisms are transformed into petroleum & natural gas in

answered May 7, 2018 by sharmaaparna1

1 answer

Explosion takes place because of

answered May 7, 2018 by sharmaaparna1

1 answer

The purest form of iron is —

answered May 4, 2018 by sharmaaparna1

1 answer

Chemical effect of electric current is also known by which term?

answered May 4, 2018 by sharmaaparna1

1 answer

Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

answered May 4, 2018 by sharmaaparna1

1 answer

The most suitable material for the preparation of handles of cooking utensils is

answered May 4, 2018 by sharmaaparna1

1 answer

On burning metals react with oxygen to produce-

answered May 4, 2018 by sharmaaparna1

1 answer

Petrol can be saved by

answered May 4, 2018 by sharmaaparna1

1 answer

At room temperature, most elements are in which phase of matter?

answered May 4, 2018 by sharmaaparna1

1 answer

If a metal can be drawn into wires relatively easily it is called:

answered May 4, 2018 by sharmaaparna1

1 answer

A type of plastic that is biodegradable has been in the news lately. The ingredient that makes it biodegradable is:

answered May 3, 2018 by sharmaaparna1

1 answer

What is the name for steel alloyed with chromium?

answered May 3, 2018 by sharmaaparna1

1 answer

The sulphuric acid turns blue litmus paper into-

answered May 3, 2018 by sharmaaparna1

1 answer

Which of the following will work best as a tester for electric current?

answered May 3, 2018 by sharmaaparna1

1 answer

Which of the following is natural resources?

answered May 3, 2018 by sharmaaparna1

1 answer

What is called black gold?

answered May 3, 2018 by sharmaaparna1

1 answer

Carbon monoxide in vehicle exhaust causes

answered May 3, 2018 by sharmaaparna1

1 answer

A Pond contains clean water. Which of the following activities will produce least pollution of water?

answered May 3, 2018 by sharmaaparna1

1 answer

CNG is the abbreviated form of

answered May 3, 2018 by sharmaaparna1

1 answer

Which of the following is Non-biodegradable

answered May 3, 2018 by sharmaaparna1

1 answer

The substance that does not burn with flame is

answered May 3, 2018 by sharmaaparna1

1 answer

Which gas is obtained during the processing of coal?

answered May 3, 2018 by sharmaaparna1

1 answer

Which of the following metals reacts vigorously with water?

answered May 3, 2018 by sharmaaparna1

1 answer

Thermoplastic is used for making which of the following?

answered May 3, 2018 by sharmaaparna1

1 answer

Which of the following is used as a material for making protective windows in space probes ?

answered May 3, 2018 by sharmaaparna1

1 answer

Which of the following causes blindness ?

asked Nov 14, 2017 by priyanka.c

1 answer

What does the law of reflection state when the ray of light reflects off a surface ?

asked Nov 14, 2017 by priyanka.c

1 answer

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