Recent questions in Olympiad-Science

The most important function of a cell membrane is that it

asked Aug 29, 2017 by priyanka.c

1 answer

Largest migration is exhibited by

asked Aug 29, 2017 by priyanka.c

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The variety of plants, animals and microbes found in a particular area is called

asked Aug 29, 2017 by priyanka.c

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The outer covering found in some microbes

asked Aug 29, 2017 by priyanka.c

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Microorganisms used in bread preparation

asked Aug 29, 2017 by priyanka.c

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Which of the following are harmful to crop plants?

asked Aug 29, 2017 by priyanka.c

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Conversion of ammonia into nitrate is called

asked Aug 29, 2017 by priyanka.c

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On contact with oxygen, Rubidium forms

asked Aug 29, 2017 by meena.p

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Which of the following is not matter

asked Aug 29, 2017 by meena.p

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a. Oxygen: diatomic b. Ozone :_______

asked Aug 29, 2017 by meena.p

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What is the formula for a gas at room temperature?

asked Aug 29, 2017 by meena.p

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In Rutherford's experiment, α particles were deflected because of

asked Aug 29, 2017 by meena.p

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The number of valence electrons determines:

asked Aug 29, 2017 by meena.p

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

asked Aug 29, 2017 by meena.p

1 answer

Fog is a solution of

asked Aug 29, 2017 by meena.p

1 answer

On industrial scale sodium metal is prepared by electrolysis of fused

asked Aug 29, 2017 by meena.p

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At constant pressure average kinetic energy of gas molecules increases 2 times if

asked Aug 29, 2017 by meena.p

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Shielding effect across period

asked Aug 29, 2017 by meena.p

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A student weighs $30\;kg$. Suppose his body is entirely made of electrons. How any electrons are there in his body? Mass of an electron$= 9.1 \times 10^{-31}\;kg$

asked Aug 29, 2017 by meena.p

1 answer

Filtration as a method of separation can be used for mixtures that are

asked Aug 29, 2017 by meena.p

1 answer

A chemistry poster indicated information on the number of particles in a newly discovered atom. According to the information in the poster the atomic number is: Protons: 113 Electrons: 113 Neutrons: 281

asked Aug 29, 2017 by meena.p

1 answer

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

asked Aug 29, 2017 by meena.p

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Which of the following has minimum spaces among the particles

asked Aug 29, 2017 by meena.p

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On contact with oxygen, Rubidium forms

asked Aug 29, 2017 by meena.p

1 answer

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

asked Aug 29, 2017 by meena.p

1 answer

The word atom is from a Greek word meaning:

asked Aug 29, 2017 by meena.p

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Which of the following alloys is used for making magnets ?

asked Aug 29, 2017 by meena.p

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Polythene and PVC are examples of

asked Aug 29, 2017 by meena.p

1 answer

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

asked Aug 29, 2017 by meena.p

2 answers

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

asked Aug 29, 2017 by meena.p

1 answer

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

asked Aug 29, 2017 by meena.p

1 answer

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

asked Aug 29, 2017 by meena.p

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The fibres manufacture by petrochemicals are

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Smog =

asked Aug 29, 2017 by meena.p

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Carbon monoxide in vehicle exhaust causes

asked Aug 29, 2017 by meena.p

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

asked Aug 29, 2017 by meena.p

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

asked Aug 29, 2017 by meena.p

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?

asked Aug 29, 2017 by meena.p

1 answer