Recent questions in Olympiad-Science

Read the passage carefully and answer the question below One of the remarkable properties of the eye is the ability of the eye to observe distinctly the objects situated at widely different distance from the eye. This property of the eye is called accommodation or power of accommodation of the eye. The accommodation of the eye is due to the action of ciliary muscles holding the eye lens. For observing distance objects (say at infinity) the ciliary muscles are relaxed. The eye lens is thin and it has maximum focal length and minimum converging power. The image of the distance object is formed on the retina. Thus for observing distant objects eye is in relaxed state. It is said to be unaccommodated. The accommodation of the eye is due to the action of

asked Sep 15, 2017 by priyanka.c

1 answer

Which of the following statements is not correct? 1) In a domestic electric circuits the live wire usually has red insulation 2) The neutral wire has black insulation 3) The earth wire has green insulation

asked Sep 15, 2017 by priyanka.c

1 answer

Which of the following instrument works on electromagnetic induction?

asked Sep 15, 2017 by priyanka.c

2 answers

The minimum wind velocity required to obtain useful energy with a wind mill is

asked Sep 15, 2017 by priyanka.c

1 answer

The maximum temperature attained in a concave reflector type solar cooker is

asked Sep 15, 2017 by priyanka.c

1 answer

How much current will be drawn by an electric heater from a 220V line, if the resistance of the heater is 50 ohms?

asked Sep 15, 2017 by priyanka.c

1 answer

The magnification of a plane mirror is +1. What does this signify?

asked Sep 15, 2017 by priyanka.c

1 answer

What is the unit for refractive index?

asked Sep 15, 2017 by priyanka.c

1 answer

______ is the commonly used material to manufacture solar cells

asked Sep 15, 2017 by priyanka.c

1 answer

______ is the source of energy in the sun and other planets

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1 answer

Lignite, Anthracite and Bituminous are varieties of

asked Sep 15, 2017 by priyanka.c

1 answer

Which of the statement is true (A) An AC can be changed to DC when required (B) In India the frequency of AC is 60 Hertz (C) The power wastage in AC transmission is high when compared to DC (D) In an AC the direction is changed after a fixed interval

asked Sep 15, 2017 by priyanka.c

1 answer

The magnitude of induced current depends upn

asked Sep 15, 2017 by priyanka.c

1 answer

Read the following passage and answer below Direction of force acting on a charge moving in a magnetic field Since the direction of current is the same as that of the motion of a positive charge, the direction of force acting on it, when moving perpendicular to direction field is the same as that acting on a current carrying conductor placed perpendicular to the direction of magnetic field. The direction of this force is given by Flemming's left-hand rule. Obviously the force acting on a negative charge moving in a direction perpendicular to the field opposite to that acting on a positive charge. Question: When both the magnetic field and the electric field are kept in the same direction, as electron which is moving in this field will

asked Sep 15, 2017 by priyanka.c

1 answer

Read the following passage and answer below Direction of force acting on a charge moving in a magnetic field Since the direction of current is the same as that of the motion of a positive charge, the direction of force acting on it, when moving perpendicular to direction of magnetic field is the same as that acting on a current carrying conductor placed perpendicular to the direction of magnetic field. The direction of this force is given by Flemming's left-hand rule. Obviously the force acting on a negative charge moving in a direction perpendicular to the field opposite to that acting on a positive charge. Question : The force of an electron moving a magnetic field is

asked Sep 15, 2017 by priyanka.c

1 answer

An electric toaster has a rating of 155W 220V marked on it/ What should be the minimum ratio(in whole number) of the fuse wire that may be required for the safe use with this toaster?

asked Sep 14, 2017 by priyanka.c

1 answer

Two wires are made up of silver. Both wires are 2m long, but wire A is 2mm thick and wire B is 4mm thick. The resistivity is

asked Sep 14, 2017 by priyanka.c

1 answer

Rare gases are

asked Sep 14, 2017 by meena.p

1 answer

All of the following are trends in the periodic table, except:

asked Sep 14, 2017 by meena.p

1 answer

Which of the following is not a balanced equation?

asked Sep 14, 2017 by meena.p

1 answer

Monosaccharides (simple sugars) have

asked Sep 14, 2017 by meena.p

1 answer

Out of total amount of water available for human use is

asked Sep 14, 2017 by meena.p

1 answer

All of the following are diatomic molecules, except:

asked Sep 14, 2017 by meena.p

1 answer

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.The solution contains:

asked Sep 14, 2017 by meena.p

1 answer

Equilibrium constant can be used to

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1 answer

The plot which shows the dependence of current I on potential difference V across a resistance as shown in the figure is

asked Sep 14, 2017 by priyanka.c

1 answer

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be :

asked Sep 14, 2017 by meena.p

1 answer

The lens which can form a virtual, erect, magnified image is

asked Sep 14, 2017 by priyanka.c

1 answer

A man wishes to use a concave mirror of 50cm as a magnifying glass. Upto what distance can you stand from the mirror?

asked Sep 14, 2017 by priyanka.c

1 answer

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

asked Sep 14, 2017 by meena.p

1 answer

Focal length of a concave mirror depends upon

asked Sep 14, 2017 by priyanka.c

1 answer

The blue colour of the sky is due to

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1 answer

The electrolytic decomposition of water gives $H_2$ and $O_2$ in the ratio of

asked Sep 14, 2017 by meena.p

1 answer

The power of accommodation of the eye decreases due to aging, this defect is called

asked Sep 14, 2017 by priyanka.c

1 answer

Which of the following hydroxides is most basic?

asked Sep 14, 2017 by meena.p

1 answer

Sodium is most likely to form a compound with which one of these elements?

asked Sep 14, 2017 by meena.p

1 answer

Which of the following is an example of a colloid?

asked Sep 14, 2017 by meena.p

1 answer

Order the following forms of matter from smallest to largest.

asked Sep 14, 2017 by meena.p

1 answer

Which of the following is not a source of waste water?

asked Sep 13, 2017 by priyanka.c

0 answers

In a filtration plant water is filtered using layer of

asked Sep 13, 2017 by priyanka.c

1 answer

Which of the following is a part of inorganic impurities of the sewage?

asked Sep 13, 2017 by priyanka.c

1 answer

Which of the following inhibits the seepage of rainwater into ground?

asked Sep 13, 2017 by priyanka.c

1 answer

Water cycle does not involve which of the following?

asked Sep 13, 2017 by priyanka.c

2 answers

Pollination refers to the

asked Sep 13, 2017 by priyanka.c

1 answer

Which of the following statements is/are true for sexual reproduction in plants? (i) Plants are obtained from seeds (ii) Two plants are always essential (iii) Fertilisation can occur only after pollination (iv) Only insects are agents of pollination Choose from the options given below

asked Sep 13, 2017 by priyanka.c

2 answers

Aquatic animals like fish excrete their wastes in gaseous form as

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1 answer

Choose the odd one from the following options:

asked Sep 13, 2017 by priyanka.c

1 answer

The coldest region on earth is the

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Cud is the name given to the food of ruminants which is

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1 answer

The enzymes present in the saliva convert

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