English Medium कक्षा १० - CBSE Question Bank Solutions for Science

Which of the following molecule is called buckministerfullerene?
C₉₀ C₆₀ C₇₀ C₁₂₀

What is the general name of all the compounds made up of carbon and hydrogen?

The colour of an aqueous solution of zinc sulphate as observed in the laboratory is:

(1) Green 

(2) Yellow 

(3) Blue 

(4) Colourless

To show that zinc is a more active metal than copper, the correct procedure is to: 

(1) add dilute nitric acid on strips of both the metals. 

(2) observe transmission of heat through strips of zinc and copper. 

(3) prepare solution of zinc sulphate and hang strip of copper into it. 

(4) prepare solution of copper sulphate and hang strip of zinc into it. 

State two characteristic features of carbon which when put together give rise to a large number of carbon compounds.

Explain the ways in which glucose is broken down in absence or shortage of oxygen. 

What is hydrocarbon? Give its one example. 

Give the structural difference between saturated and unsaturated hydrocarbons with two examples each.

Name of the following compounds : 

Write the relation between resistance and electrical resistivity of the material of a conductor in the shape of a cylinder of length `'l'`  and area of cross-section `'A'` . Hence derive the S.I. unit of electrical resistivity.

Resistance of a metal wire of length 5 m is 100 Ω . If the area of cross - section of the wire is `3 × 10^-7  "m"^2` , Calculate the resistivity of the metal . 

List the conclusions you will draw while studying the following properties of ethanoic acid : 

(a) Odour

(b) Solubility in water

(c) Effect on litmus paper

(d) Reaction with sodium hydrogen carbonate 

What is observed after about 1 hour of adding the strips of copper and aluminium separately to the ferrous sulphate solution filled in two beakers? Name the reaction if any change in colour is noticed. Also, write a chemical equation for the reaction.

Answer the following question.
Explain with the help of the pattern of magnetic field lines the distribution of the magnetic field due to a current-carrying a circular loop.

Answer the following question:
Why is it that the magnetic field of a current-carrying coil having n turns, is 'n' times as large as that produced by a single turn (loop)?

Identify the type of reaction taking place in the following case and write the balanced chemical equation for the reaction.
Zinc reacts with silver nitrate to produce zinc nitrate and silver.

Classify the following reaction into different type:

AgNO₃(aq) + NaCl(aq) →AgCl(s) + NaNO₃(aq)