Sample paper Science Questions CBSE 10

9/24/2015 CBSE

Sample paper� Science Questions CBSE

Q.1 What is the name of
physical quantity which is equal to V/I


Ans. Since V/I =R where R is called the
resistance of the conductor. Therefore, the required physical quantity


is resistance.


Q.2 Write the type of
reactions in the following :


(i) Reaction between an
acid and a base.


(ii) Rusting of iron.


Ans. (i) Neutralisation reaction. (ii)
Oxidation reaction.


Q.3 Give the names of the
functional groups.


(i) � CHO (ii) C = O


Ans. (i) Aldehyde group (ii) Ketone group


Q.4 Write the function of
Iris in the human eye.


Ans. Iris is a coloured muscular diaphragm
that controls the size of the pupil.


Q.5 What is the S.I. unit
of electrical potential ?


Ans. S.I. unit of electrical potential is
Volt.


Q.6 Choose a strong acid
and a strong base from the following :


CH3COOH, NH4OH,
KOH, HCI


Ans. HCL Strong acid


KOH Strong base


Q.7 What are esters ? Write
an equation to show the formation of an ester.


Ans. Esters are sweet smelling organic
compounds. Their function group is R1COOR2, where R1 and
R2 are alkyl
radicals.



CH3 COOH + C
2
H 5OH ��������� H2SO4

CH3 COOC2 H2 ��+ ���H2 O



Ethanoic ��������
Ethanol����������� ���������� �����������Ethyl ethanoate



Acid



 



Q.8 An
electric iron has a rating of 750 W, 220 V. Calculate :



(i) Current
passing through it, and



(ii) its
resistance, when in use.



 



Ans. P = 750 watt, V = 220
volt. I = ? r = ?



 



We know P = VI



 



\
(i) I (Current) = 750 /220



 



= 3.4 ampere


 



and (ii)� V= R/1



 



\
R (Resistance) = 220 /64.7
ohms



 




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