Recent questions tagged olympiad

Find the value of following expression DCCLXIII + CDXXXIX =

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Find the value of following expression (76÷4-4)x 6+((6x 7)-3)=

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Find the missing place value from the following number 50000 + 800000 + ............ + 2000 + 5 + 30 = 852135

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A cook bought 5 kg potatoes and 10 kg tomatoes. If 1 kg of tomato cost Rs 25 and 1 kg of potato costs Rs 20. What is the total amount paid by the cook

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The product of two numbers is 65 and the difference of those two numbers is 8 what are the two numbers

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A flight ticket is 15 cm long and 19 cm wide. What is its perimeter?

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There are 7 yellow balls, 4 green balls, 3 red balls and 6 blue balls. If a ball is selected at random what is the probability that it i not a blue ball?

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A doll in a shop costed Rs. 736.50 paise. Shyam paid the shopkeeper Rs 1000. How much change did shyam get from the shopkeeper ?

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Swamy puts 18 chocolates in bag 1, 36 chocolates in bag 2, 72 chocolates in bag 4. How many chocolates did he pit in bag?

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Which is more from the following 1) 10 decimeters 2) 10 millimeters 3) 100 millimeters 4)100 decimeters

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How many vertices does the given figure has

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What is the sequence of the following number pattern? 2, 2, 4, 12, 48, 240

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

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

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Aluminium oxide is a/an

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

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

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

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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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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.

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How many straight lines are there in the given figure

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

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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?

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

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__________ carbide reacts with water to give methane

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

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The product of equivalent weight and valency of an element is equal to _

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Which one of the following element is essential for construction is nuclear reactors?

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The chemical formula of caustic potash is

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Which is not true about the noble gases?

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Human bone does not contain

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The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

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Which of the following does not belong to the same homologous series?

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The fission products obtained after the fission of $U_{235}$ is

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In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

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One Mev of energy is equivalent to

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The near point of a hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book at 25 cm from the eye?

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Which has greater resistance, a toaster of 1KW and an electric heater of 2KW?

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Which of the following reactions will not take place?

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The amount of charge that would flow in 2 hours through the element of an electric bulb drawing a current of 0.25 A is

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In Faraday's experiment when the magnet is stationary, there is

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A positively charged particle projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

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Which of the following metals is not attacked by the environment—

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The density of the gas is equal to

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The intensity of scattered light varies inversely as the $n^{th}$ power of wavelength of incident light where

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An element X forms an oxide XO3 What is the valency of X?

asked Sep 18, 2017 by meena.p

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Read the passage below and answer the following question below When the direction of relative motion between the magnet and the coil is reversed i.e; instead of bringing the magnet and the coil towards each other, if they are taken away from each other, the direction of deflection in the galvanometer (i.e; induced current in the coil) is also reversed. It is due to the reason that when we being the magnet and the coil closer to each other, the magnetic flux linked with the coil increases whereas when these are moved away from each other, the magnetic flux linked with the coil decreases. Thus it is the change (whether an increase or a decrease) in magnetic flux in the coil which induces current in the coil. Increasing magnetic flux induces current in one direction whereas decreasing magnetic flux induces current in the opposite direction. Question : 1. Increase in the magnetic flux increases the induced current 2. Decrease in the flux decreases the induced current

asked Sep 18, 2017 by priyanka.c

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The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is -

asked Sep 18, 2017 by meena.p

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Read the passage below and answer the following question below When the direction of relative motion between the magnet and the coil is reversed i.e; instead of bringing the magnet and the coil towards each other, if they are taken away from each other, the direction of deflection in the galvanometer (i.e; induced current in the coil) is also reversed. It is due to the reason that when we being the magnet and the coil closer to each other, the magnetic flux linked with the coil increases whereas when these are moved away from each other, the magnetic flux linked with the coil decreases. Thus it is the change (whether an increase or a decrease) in magnetic flux in the coil which induces current in the coil. Increasing magnetic flux induces current in one direction whereas decreasing magnetic flux induces current in the opposite direction. Question : What is the factor which induces the current in the coil?

asked Sep 18, 2017 by priyanka.c

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In an experiment to study the dependence of current on potential difference across a resistor a student obtained graph as shown in fig: The value of the resistor is

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