Recent questions in Olympiad-Science

The power of a lens is -2.0D. What will be its focal length?

asked Sep 19, 2017 by priyanka.c

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An incident ray makes an angle of $25^{\circ}$ with the surface of a plane mirror. What will be the angle of reflection?

asked Sep 19, 2017 by priyanka.c

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What is the minimum size of a plane mirror which can enable a man to see his full image?

asked Sep 19, 2017 by priyanka.c

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Which of the following are not responsible for acid rain?

asked Sep 19, 2017 by priyanka.c

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The particles which causes fission of U-235 atom are

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Magnetic fields do not interact with

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The radiations from the sun which is felt by us in the form of heat is

asked Sep 19, 2017 by priyanka.c

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A bar magnet falls vertically through a magnet. Its acceleration is

asked Sep 19, 2017 by priyanka.c

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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

1 answer

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

1 answer

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

asked Sep 19, 2017 by priyanka.c

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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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Name the process associated with acylation of benzene

asked Sep 19, 2017 by meena.p

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In the following reaction, identify the products $Na_2CO_3(aq)+2HCl(aq) \to$ __________

asked Sep 19, 2017 by meena.p

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Which of the following metals does not displace $H_2$ gas from dilute HCl or dilute $H_2SO_4$?

asked Sep 19, 2017 by meena.p

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A hydrocarbon compound burns with a non-luminous flame. Which hydrocarbon type does it indicate?

asked Sep 19, 2017 by meena.p

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Differen Diamond is harder than graphite because of

asked Sep 19, 2017 by meena.p

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Which are the fundamental particles present in the nucleus of an atom ?

asked Sep 19, 2017 by meena.p

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Maximum iron ore is found in which of the following states ?

asked Sep 19, 2017 by meena.p

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The luster of a metal is due to :

asked Sep 19, 2017 by meena.p

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Ethanol reacts with sodium and forms two products. These are

asked Sep 19, 2017 by meena.p

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Which of the following are the characteristics of isotopes of an element? i. Isotopes of an element have same atomic masses ii. Isotopes of an element have same atomic number iii. Isotopes of an element show same physical propertiesr> <biv. Isotopes of an element show same chemical properties

asked Sep 19, 2017 by meena.p

0 answers

If concentration of $H^+$ is greater than $1 \times 10^{-7}$ then solution is

asked Sep 19, 2017 by meena.p

1 answer

Solvents used for cleaning electronic circuit boards are

asked Sep 19, 2017 by meena.p

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Silver articles becomes black on prolonged exposure to air. This is due to the formation of

asked Sep 19, 2017 by meena.p

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10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HC1. If we take 20 mL of the same solution of NaOH, the amount of HC1 solution (the same solution as before) required to neutralise it will be

asked Sep 19, 2017 by meena.p

1 answer

“Atoms can neither be created nor destroyed.” This principle was given by __?

asked Sep 19, 2017 by meena.p

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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

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Because of the formation of which of the following lime water turns milky when carbon dioxide is passed in it?

asked Sep 18, 2017 by meena.p

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__________ carbide reacts with water to give methane

asked Sep 18, 2017 by meena.p

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The hydrocarbon in which all the four valencies of carbon atoms are fully utilized are called________

asked Sep 18, 2017 by meena.p

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