Recent questions tagged class 10

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

asked Sep 19, 2017 by meena.p

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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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Ethers are formed by attachment of

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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

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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:

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 ?

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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

asked Sep 18, 2017 by priyanka.c

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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?

asked Sep 18, 2017 by meena.p

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One Mev of energy is equivalent to

asked Sep 18, 2017 by priyanka.c

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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?

asked Sep 18, 2017 by priyanka.c

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

asked Sep 18, 2017 by priyanka.c

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Which of the following reactions will not take place?

asked Sep 18, 2017 by meena.p

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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

asked Sep 18, 2017 by priyanka.c

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

asked Sep 18, 2017 by priyanka.c

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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—

asked Sep 18, 2017 by meena.p

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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

asked Sep 18, 2017 by priyanka.c

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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

1 answer

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

asked Sep 18, 2017 by priyanka.c

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Read the following statement and mark the correct option 1. Resistivity of a conductor depens on the nature of the material of the conductor 2. Resistance of a conductor is inversely proportional to its length

asked Sep 18, 2017 by priyanka.c

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Parallel rays from the top of a distant object incident on a cave mirror from an image on the screen. The diagram correctly showing the image of the object on the screen is

asked Sep 18, 2017 by priyanka.c

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What is the value of focal length of a plane mirror?

asked Sep 18, 2017 by priyanka.c

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