Recent questions tagged olympiad

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

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

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

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

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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

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On what principle does cinematography work?

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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?

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Which of the following statement are incorrect?

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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

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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 $Na_2CO_3(aq)+2HCl(aq) \to$ __________

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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?

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Differen Diamond is harder than graphite because of

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

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

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The luster of a metal is due to :

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Ethanol reacts with sodium and forms two products. These are

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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

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

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Solvents used for cleaning electronic circuit boards are

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

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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

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

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

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

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Which of the following statements is not correct?

asked Sep 19, 2017 by meena.p

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