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Recent questions and answers in Class 10

Questions >> Olympiad-Science >> Class 10

Which of the following instrument works on electromagnetic induction?

answered Apr 29, 2020 by harirao.e

2 answers

The main constituent of petroleum gas is

answered Mar 15, 2020 by deepalij928

1 answer

Which type of lens have negative power?

answered Mar 2, 2020 by amishak5792275

1 answer

The angle between two refracting faces of a prism is known as

answered Feb 10, 2020 by sidharthsundeep2004

1 answer

A charged body at rest produces

answered Feb 10, 2020 by jibannayak2011

1 answer

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

answered Feb 7, 2019 by bijubalangcc

3 answers

Which of the following statements are correct? <br><br> 1. The magnetic lines of force are always continuous loops, so they are endless.<br> 2. The lines of force always starts from the south pole to north pole <br> 3. Soft iron core is generally not preferred for solenoid<br> 4. Force of the moving charge is maximum when it moves perpendicular to the direction pf the magnetic field.

answered Jan 20, 2019 by kavyamanchanda512

1 answer

Air is not visible because it

answered Jan 18, 2019 by shababkhan73668

1 answer

The apparent depth of an object at the bottom of the tank filled with a liquid of refractive index 1.3 is 7.7 cm. What is the actual depth of the liquid in the tank?

answered Dec 7, 2018 by dta79989

2 answers

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

answered Oct 10, 2018 by meena.p

1 answer

Name the process associated with acylation of benzene

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

Differen Diamond is harder than graphite because of

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

The luster of a metal is due to :

answered Jun 8, 2018 by sharmaaparna1

1 answer

Ethanol reacts with sodium and forms two products. These are

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 8, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

Which of the following statements is not correct?

answered Jun 7, 2018 by sharmaaparna1

1 answer

Ethers are formed by attachment of

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

Aluminium oxide is a/an

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

In the reaction $2PbO + C \to 2Pb + CO_2$<br> (a) lead is getting reduced <br> (b) carbon dioxide is getting oxidised <br> (c) lead oxide is getting reduced. <br> (d) carbon is getting reduced.

answered Jun 7, 2018 by meena.p

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.The solution contains:

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

When copper oxide is heated with hydrogen, copper metal and water are formed. What happens to the copper oxide in this reaction?

answered Jun 7, 2018 by sharmaaparna1

1 answer

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

answered Jun 7, 2018 by sharmaaparna1

1 answer

__________ carbide reacts with water to give methane

answered Jun 6, 2018 by sharmaaparna1

1 answer

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

answered Jun 6, 2018 by sharmaaparna1

1 answer

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

answered Jun 6, 2018 by sharmaaparna1

1 answer

The chemical formula of caustic potash is

answered Jun 6, 2018 by sharmaaparna1

1 answer

Which is not true about the noble gases?

answered Jun 6, 2018 by sharmaaparna1

1 answer

Human bone does not contain

answered Jun 6, 2018 by sharmaaparna1

1 answer

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?

answered Jun 6, 2018 by sharmaaparna1

1 answer

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

answered Jun 6, 2018 by sharmaaparna1

1 answer

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?

answered Jun 6, 2018 by sharmaaparna1

1 answer

Depletion of water table is due to

asked Nov 5, 2017 by priyanka.c

1 answer

It is painful to walk bare footed on a road converted with pebbles because

asked Oct 30, 2017 by priyanka.c

1 answer

Both eyes seeing the same object is called?

asked Oct 25, 2017 by priyanka.c

1 answer

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