Recent questions tagged t6

The rule which determines the polarity of a circular current loop is

asked Sep 19, 2017 by priyanka.c

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The scientist who first suggested that a magnet should exert force on a current carrying conductor was

asked Sep 19, 2017 by priyanka.c

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Read the passage carefully and answer the question given below Electric fuse: It is a safety device used to protect electrical appliances from strong currents. A fuse wire must have high resistivity and low melting point. It is usually made from an alloy of tin and lead. It is put in series with the live wire of the circuit. The electric installations are thus saved from getting damaged. Thus fuses used for domestic purpose are rated 1A, 2A, 3A, 5A, 10A, etc. For an electric iron that consumes 1KW electric power when operated at 220V, a current of (1000/220) A that is 4.54A will flow in the circuit. In this case a 5A fuse must be used. Question : A toaster is marked 1500W/220V. What should be the rating to fuse used across this appliance

asked Sep 19, 2017 by priyanka.c

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Read the passage carefully and answer the question given below Electric fuse : It is a safety device used to protect electrical appliances from strong currents. A fuse wire must have high resistivity and low melting point. It is usually made from an alloy of tin and lead. It is put in series with the live wire of the circuit. When the current exceeds the safety limit, the fuse wire melts and breaks the circuit. The electric installations are thus saved from getting damaged. The fuses used for domestic purposes are rated 1A, 2A, 3A, 5A, 10A etc. For an electric iron that consumes 1KW electric power when operated at 220V, a current of (1000/220). A that is 4.54 A will flow in the circuit. In this case a 5A fuse must be used . Question : Fuse wire connected in circuits work under the principle of

asked Sep 19, 2017 by priyanka.c

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6. Three resistances of 2Ω each are connected to form a triangle. The resistance between any two terminal is

asked Sep 19, 2017 by priyanka.c

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On what principle does cinematography work?

asked Sep 19, 2017 by priyanka.c

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One kilo watt hour is equal to _______J

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What will be the angle of deviation of a ray if it passes through its optic centre?

asked Sep 19, 2017 by priyanka.c

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Which of the following statement are incorrect?

asked Sep 19, 2017 by priyanka.c

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1. Red light of wavelength $750 nm$ enters a glass plate of refractive index $1.5$. If the velocity of light in vacuum is $3 \times 108 m/s$, then its frequency is

asked Sep 19, 2017 by priyanka.c

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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

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

asked Sep 13, 2017 by meena.p

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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

asked Sep 13, 2017 by meena.p

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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

asked Sep 13, 2017 by meena.p

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