Science important questions of 2marks,3 marks and 5 marks-class X

 Important Questions

2 marks question

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1.When electricity is passed an aqueous solution of sodium chloride, 3 products are obtained .Then why is the process called chlor alkali process.

2.An electric iron consumes energy at a rate of 840 W when the heating is at the minimum rate and 360 W when the heating is at the minimum rate.The applied voltage is 220 V.What is the value of current and resistance in each case.

3.Write any two properties of ionic compound?

4.Show the formation of aluminium chloride by the transfer of electron between the atoms.(Atomic number of aluminium and chlorine are 13 and 17 respectively)

5.Describe the components of blood along with their function.

6.i.Describe the role of fallopian tube in the female reproductive system.

ii.Explain placenta.

7.i.Discuss the symptoms of the following bactterial diseases.

a)Gonorrhoea

b)Syphilis.

ii.Write the full form of the following .

a)AIDS

b)HIV

8.i. In which direction does the wire shown in the diagram given below tend to move?

ii.In an experiment ,there are two coils wound on a non-conducting cylindrical rod.

Initially ,key is not inserted.Discuss  the case when key is inserted and when it is removed.

3 marks questions

9.Describe the location ,structure and functions of kidney in human beings.

10.State which of the following chemical reactions will take place or which will not,giving suitable reason for each?

i)Zn(s)+ CuSO4 (a)-------->ZnSO4 (aq) +Cu(s)

ii)Fe(s) +ZnSO4(aq)--------->FeSO4 (aq) +Zn(s)

iii)Zn(s)+FeSO4(aq)----------->ZnSO4(aq)+Fe(s)

11.Give reasons ,Why?

i)connecting wires are made up of copper.

ii)Nichrome is used to make the element of electric heater and .

iii)The 500W bulb glows with more brightness than a 200W?

12.i.A student carries out an experiment and plots the V-I graph of three samples of Nichrome  wire with resistance R1,R2  and R3, respectively as shown in figure.Interpret the graph by considering R1,R2 and R3 in proper order.

ii.Why does the electrical resistivity of a given metallic wire depends on the nature of the material?

13.Describe the stages of respiration.

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14.

i.Identify the process taking place in the diagram .when does this process become essential for an individual?

ii.Describe the above process in detail.

15.During the reaction of some metals with dilute hydrochloric acid, following observations were made .

i.The temperature of the reaction mixture rises when aluminium (Al) is added.

ii.The reaction of sodium metal is found to be highly explosive .

iii.Some.bubbles of a gas are seen when lead (Pb) is reacted with the acid.Explain these observations giving suitable reasons.

16.i.A convex lens made of a material of refractive index n2 is kept in a medium of refractive index n1.A parallel beam of light is incident on the lens .Draw the path of rays of light emerging from the convex lens,if

a)n1<n2

b)n1=n2

ii.If the magnification of the image formed by a mirror is negative ,then what does it mean?

5marks questions 

17.Write the  structural formulae of  all isomers of an alkane with six C-atoms(C6H16)

18.Explain the nature of the covalent bond using the bond formation in CH3 Cl.

19.'Lenght of food chains in an ecosystem is generally limited to three or  four trophic levels '.Justify the statement.

20.Give the answer of the following questions.

i.Compare the power used in in 2Ω resistors in each of the following circuits 

a)a 6V battery in series with 1Ω and 2Ω resistors.

b)a 4Ω battery in parallel with 12Ω and 2Ω resistors.

ii.How does the resistance of a wire vary with it's area of cross-section?

21.

i.A current of 1 A flows in a series circuit having an electric  lamp and a conductor of 5Ω when connected to a 10V battery .Calculate the resistance of the electric lamp

ii.Now ,if  a resistance of 10Ω is connected in parallel with this series combination ,then what change (if any ) in current flowing through 5Ωconductor and potential difference across the lamp will take place ?Give reason.

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By Anuranjan Gadekar

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