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
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)
Q.3 Give the names of the
(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
Q.6 Choose a strong acid
and a strong base from the following :
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
2H 5OH ��������� H2SO4�
CH3 COOC2 H2 ��+ ���H2 O
Ethanol����������� ���������� �����������Ethyl ethanoate
electric iron has a rating of 750 W, 220 V. Calculate :
passing through it, and
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