Recent questions tagged science

Which of the following instrument works on electromagnetic induction?

asked Sep 15, 2017 by priyanka.c

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

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

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

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

asked Sep 15, 2017 by priyanka.c

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What is the unit for refractive index?

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______ is the commonly used material to manufacture solar cells

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

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Lignite, Anthracite and Bituminous are varieties of

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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

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The magnitude of induced current depends upn

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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

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Rare gases are

asked Sep 14, 2017 by meena.p

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

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Which of the following is not a balanced equation?

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Monosaccharides (simple sugars) have

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Out of total amount of water available for human use is

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All of the following are diatomic molecules, except:

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

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Equilibrium constant can be used to

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

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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 :

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1 answer

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

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

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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

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The blue colour of the sky is due to

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

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

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Which of the following hydroxides is most basic?

asked Sep 14, 2017 by meena.p

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

asked Sep 14, 2017 by meena.p

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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

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An element has an atomic number of 15 with which of the following elements will it show similar chemical properties.

asked Sep 13, 2017 by meena.p

1 answer

Which of the following gases can be used for storage of fresh sampel of an oil for a long time?

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Nail polish remover contains ?

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Conditions for equilibrium of concentration of reactant and products will be same if

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Strands of DNA are held together by

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Methyl orange is

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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 13, 2017 by meena.p

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In the reaction $2PbO + C \to 2Pb + CO_2$ (a) lead is getting reduced (b) carbon dioxide is getting oxidised (c) lead oxide is getting reduced. (d) carbon is getting reduced.

asked Sep 13, 2017 by meena.p

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Addition of hydrogen to ethene forms

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In magnetic separation, magnets are used to separate

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The inert gases are ____ in water

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The substance which, on treating with chlorine, yields bleaching powder is

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A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is :

asked Sep 13, 2017 by meena.p

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The by product of soap is

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