Recent questions tagged t9

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb ?

asked Oct 11, 2017 by priyanka.c

1 answer

Read the passage below and answer the question given below The blue colour of the sky is due to the scattering of the sunlight by the molecules of the atmosphere. The molecules of air, such as $N_2$ and $O_2$ have sizes smaller than the wavelength of visible light. As sunlight passes through the atmosphere these molecules absorb some amount of sunlight and re-emit it. They scatter blue light of shorter wavelength more strongly than red light of stronger wavelength. When we look at the sky scattered light enters our eyes and this light contains blue light in large proportion. That is why the sky appears blue. QUESTION : The colour of the sky in the absence of the atmosphere is

asked Oct 11, 2017 by priyanka.c

1 answer

Read the passage below and answer the question given below The blue colour of the sky is due to the scattering of the sunlight by the molecules of the atmosphere. The molecules of air, such as $N_2$ and $O_2$ have sizes smaller than the wavelength of visible light. As sunlight passes through the atmosphere these molecules absorb some amount of sunlight and re-emit it. They scatter blue light of shorter wavelength more strongly than red light of stronger wavelength. When we look at the sky scattered light enters our eyes and this light contains blue light in large proportion. That is why the sky appears blue. Question : The scattering of light depends on (1) wavelength of light (2) frequency of light (3) molecules of the atmosphere (4) medium

asked Oct 11, 2017 by priyanka.c

1 answer

Tyndall effect is a phenomenon of

asked Oct 11, 2017 by priyanka.c

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The light sensitive part of the eye is

asked Oct 11, 2017 by priyanka.c

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Bifocal lenses are used by people who suffer from

asked Oct 11, 2017 by priyanka.c

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What type of lens is an air bubble inside water ?

asked Oct 11, 2017 by priyanka.c

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Name the instrument used by the opticians to measure the power of the lens directly

asked Oct 11, 2017 by priyanka.c

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An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. Is this lens converging or diverging ?

asked Oct 11, 2017 by priyanka.c

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An optically denser medium should posses greater mass density than an optically rarer medium. Is this statement true or false ?

asked Oct 11, 2017 by priyanka.c

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During smelting, an additional substance is added which combines with impurities to form a fusible product known as

asked Sep 19, 2017 by meena.p

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The most abundant element in the earth's crust is ?

asked Sep 19, 2017 by meena.p

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Which of the following statements is not correct?

asked Sep 19, 2017 by meena.p

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Ethers are formed by attachment of

asked Sep 19, 2017 by meena.p

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Compounds which are added in soil to provide essential elements to plants are called

asked Sep 18, 2017 by meena.p

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Which one of the following gases is readily soluble in water at room temperature?

asked Sep 18, 2017 by meena.p

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Aluminium oxide is a/an

asked Sep 18, 2017 by meena.p

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Pentane has the molecular formula $C_5H_{12}$. It has

asked Sep 18, 2017 by meena.p

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Arrange the following elements in the order of their increasing nonmetallic character: Li, O, C, Be, F

asked Sep 18, 2017 by meena.p

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Which of the following salts does not contain water of crystallisation?

asked Sep 18, 2017 by meena.p

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

asked Sep 18, 2017 by meena.p

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Hard water is not available for an experiment. Some salts are given below : (I) Sodium chloride (II) Sodium sulphate (III) Calcium chloride (IV) Calcium sulphate (V) Potassium chloride (VI) Magnesium sulphate Select from the following group of these salts, each member of which may be dissolved in water to make it hard.

asked Sep 18, 2017 by meena.p

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The metallurgical process in which a metal is obtained in a fused state is called ?

asked Sep 18, 2017 by meena.p

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When copper oxide is heated with hydrogen, copper metal and water are formed. What happens to the copper oxide in this reaction?

asked Sep 18, 2017 by meena.p

1 answer