Class X Science Question paper

 SET-1

SCIENCE

Time allowed : 3 hours

Maximum Marks : 80

General Instructions :
(i)
The question paper comprises five Sections, A, B, C, D and E. You are to
attempt All the sections.
(ii)
All questions are compulsory.
(iii) Internal choice is given in Sections B, C, D and E.
(iv) Questions number 1 and 2 in Section A are one-mark questions. They are
to be answered in one word or in one sentence.
(v)
Questions number 3 to 5 in Section B are two-marks questions. These are
to be answered in about 30 words each.
(vi) Questions number 6 to 15 in Section C are three-marks questions. These
are to be answered in about 50 words each.
(vii) Questions number 16 to 21 in Section D are five-marks questions. These
are to be answered in about 70 words each.
(viii) Questions number 22 to 27 in Section E are based on practical skills.

SECTION A
1. Name an enzyme present in pancreatic juice.
2. Mention the main social problem caused by building large dams.

SECTION B
3. A metal compound X reacts with dilute hydrochloric acid to produce brisk
effervescence. The gas evolved forms a white precipitate when passed
through lime water. Write balanced chemical equations involved in the
above mentioned chemical reactions.
4.
ZrMo Xem©E JE AmaoI Ho$ ^mJ
A Am¡a
^mJ
B H$m
2
Zm_ Am¡a àË`oH$ H$m EH$ H$m`© {b{IE &
B
A
Write the name and one function each of the parts A and B shown in the
following diagram.
B
A
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3
P.T.O.5.
àH$me Ho$ AndV©Z H$m ñZob H$m {Z`_ {b{IE & àH$me H$s Mmb Ho$ nXm| _| {H$gr _mÜ`_
Ho$ {Zanoj AndV©Zm§H$ Ho$ {bE ì`§OH$ {b{IE &
AWdm 2
n«H$me dm`w go 1·50 AndV©Zm§H$ Ho$ H$m±M _| àdoe H$aVm h¡ & H$m±M _| àH$me H$s Mmb
n[aH${bV H$s{OE &
{X`m J`m h¡ : {Zdm©V _| àH$me H$s Mmb = 3  10 8 m/s. 2
State Snell’s law of refraction of light. Write an expression for the
absolute refractive index of a medium in terms of speed of light.
OR
Light enters from air to glass having refractive index 1·50. Calculate the
speed of light in the glass.
Given : The speed of light in vacuum is = 3  10 8 m/s.
^mJ g
SECTION C
6.
(a)
ZrMo Xr JB© A{^{H«$`m
MnO 2 + 4HCl   MnCl 2 + 2H 2 O + Cl 2
(b)
_| CnMm`H$ Am¡a AnMm`H$ H$s nhMmZ H$s{OE &
H$maU Xr{OE :
(i)
(ii)
(a)
dgm`wº$ Am¡a V¡br` ImÚ - gm_J«r _| à{V - Am°ŠgrH$maH$ {_bmE OmVo h¢ &
gy` © Ho$ àH$me _| ídoV {gëda ŠbmoamBS> H$m a§J Yyga hmo OmVm h¡ &
In the following reaction :
MnO 2 + 4HCl   MnCl 2 + 2H 2 O + Cl 2
Identify the oxidant and reductant.
(b)
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Give reasons :
(i) Antioxidants are added to foods containing fats and oils.
(ii) White silver chloride turns grey in sunlight.
4
37.
(a)
(b)
(c)
(a)
(b)
8.
pH ñHo$b
Š`m _mnVm h¡ ?
BgH$m n[aga {b{IE &
pH ñHo$b Ho$ CƒV_ Am¡a {ZåZV_ _mZm| H$s gmW©H$Vm H$m C„oI H$s{OE &
AWdm
3
bdUOb (~«mBZ) Ho$ {dÚwV² - AnKQ>Z H$mo ‘Šbmoa - jma à{H«$`m’ Š`m| H$hVo h¢ ? Bg
à«{H«$`m _| gpå_{bV amgm`{ZH$ g_rH$aU {b{IE &
{H$gr ewîH$ naIZbr _| H$m°na gë\o$Q> Ho$ Hw$N> Ob`mo{OV {H«$ñQ>bm| H$mo J_© {H$`m
J`m h¡ & {H$Ýht Xmo àojUm| H$s gyMr ~ZmBE &
(a) What does pH scale measure ?
(b) Write its range.
(c) State the significance of highest and lowest values of pH scale.
OR
(a) Why is electrolysis of brine called ‘Chlor-alkali process’ ? Write the
chemical equation involved in this process.
(b) A few crystals of hydrated copper sulphate are heated in a dry
test-tube. Enlist any two observations.
{ZåZ{b{IV VÎdm| H$s VwbZm H$moîR>H$ _| {XE JE A{^bjUm| Ho$ AZwgma H$s{OE :
(a)
br{W`_ Am¡a ZmBQ´>moOZ (na_mUw {ÌÁ`m)
(b)
nmoQ>¡{e`_ Am¡a ŠbmoarZ ({dÚwV²G$UVm)
(c)
_¡½Zr{e`_ Amoa H¡$pëe`_ (g§`moOH$Vm)
àË`oH$ àH$aU _| AnZo CÎma H$m H$maU Xr{OE &
3
3
Compare the following elements as per the characteristics given in the
brackets :
(a)
Lithium and Nitrogen (Atomic radii)
(b)
Potassium and Chlorine (Electronegativity)
(c)
Magnesium and Calcium (Valency)
Give reason for your answer in each case.
9.
Ý`yam°Z H$m AmaoI It{ME VWm AmaoI _| CZ ^mJm| Ho$ Zm_ A§{H$V H$s{OE Ohm±
(a)
gyMZm Cnm{O©V H$s OmVr h¡,
(b)
go hmoH$a gyMZm {dÚwV² AmdoJ Ho$ ê$n _| J_Z H$aVr h¡, VWm
(c)
{dÚwV² AmdoJ AmJo àofU Ho$ {bE amgm`{ZH$ {g½Zb _| n[ad{V©V hmoZo Mm{hE &
AWdm
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3
P.T.O.ZrMo {XE JE àË`oH$ nmXn hm°_m©oZ H$m H$m`© {b{IE :
(a)
{O~ao{bZ
(b)
Am°pŠgZ
(c)
Epãg{gH$ Aåb
3
Draw a diagram of neuron and name and label the part
(a)
where information is acquired,
(b)
through which information travels as an electric impulse, and
(c)
where the electric impulse must be converted into a chemical
signal for onward transmission.
OR
State the function of each of the following plant hormones :
10.
(a) Gibberellins
(b) Auxins
(c) Abscisic acid
(a) OmBb_ Am¡a âbmoE_ Ho$ ~rM Xmo {d^oXZH$mar bjUm| H$s gyMr Vm{bH$m Ho$ ê$n _|
~ZmBE &
nmXnm| _| ñWmZmÝVaU Ho$ Xmo bm^ {b{IE &
(b)
11.
(a) List in tabular form two differentiating features between xylem
and phloem.
(b) Write two advantages of transpiration in plants.
3
20 cm \$moH$g
Xÿar Ho$ {H$gr CÎmb b|g go {H$gr {~å~ H$mo {H$VZr Xÿar na aIm OmZm Mm{hE
Vm{H$ BgH$m dmñV{dH$ à{V{~å~ b|g go 30 cm Xÿar na àmßV hmo ? `{X {~å~ 4 cm bå~m
h¡, Vmo à{V{~å~ H$s bå~mB© kmV H$s{OE &
AWdm
20 cm \$moH$g Xÿar Ho$ {H$gr AdVb Xn©U Ho$ gm_Zo {H$gr {~å~ H$mo H$hm± aIm OmE Vm{H$
CgH$m Xmo JwZm Amd{Y©V Am^mgr à{V{~å~ àmßV hmo ?
How far should an object be placed from a convex lens of focal length
20 cm to obtain its real image at a distance of 30 cm from the lens ?
Determine the height of the image if the object is 4 cm tall.
OR
Where should an object be placed in front of a concave mirror of focal
length 20 cm so as to obtain a two times magnified virtual image of the
object ?
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3
312.
ZrMo {XE JE H$WZm| H$s nwpîQ> H$s{OE :
(a)
{dÚwV² ~ë~m| Ho$ VÝVwAm§o Ho$ {Z_m©U _| EH$_mÌ Q>§½ñQo>Z H$m hr Cn`moJ {H$`m OmVm h¡ &
(b)
Kaoby n[anWm| _| loUr ì`dñWm H$m Cn`moJ Zht {H$`m OmVm h¡ &
(c)
{dÚwV² g§MaU _| àm`: H$m°na Am¡a Eobw{_{Z`_ Ho$ Vmam| H$m Cn`moJ {H$`m OmVm h¡ &
3
Justify the following statements :
(a)
Tungsten is used exclusively for filaments of electric lamps.
(b)
Series arrangement is not used for domestic circuits.
(c)
Copper and aluminium wires are usually employed for electricity
transmission.
13.
ZrMo {XE JE n[anW _| {XE JE à{VamoYH$m| R 1 , R 2 Am¡a R 3 Ho$ _mZ H«$_e: 10 , 20 
Am¡a 30  h¢, {OÝh| 12 V H$s ~¡Q>ar go g§`mo{OV {H$`m J`m h¡ & {ZåZ{b{IV H$m n[aH$bZ
H$s{OE :
(a) àË`oH$ à{VamoYH$ go àdm{hV Ymam,
(b) n[anW H$m Hw$b à{VamoY, VWm
(c) n[anW _| àdm{hV Hw$b Ymam &
3
In the circuit given below, the resistors R 1 , R 2 and R 3 have the values
10 , 20  and 30  respectively,
which have been connected to a
battery of 12 V. Calculate
(a) the current through each resistor,
(b) the total circuit resistance, and
(c) the total current in the circuit.
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P.T.O.14.
Zm{^H$s` D$Om© CËnÞ H$aZo _| Cn`moJ hmoZo dmbr à{H«$`m H$m Zm_ {b{IE & Zm{^H$s` D$Om©
Ho$ OZZ _| gm_mÝ`V: Cn`moJ hmoZo dmbo Xmo VÎdm| H$s gyMr ~ZmBE & dh Xmo H$maU {b{IE
Omo ~¥hV² ñVa na Zm{^H$s` D$Om© Ho$ Cn`moJ H$mo {ZfoYH$ ~ZmVo h¢ &
3
Name the process used to generate nuclear energy. List two elements
commonly used for the generation of nuclear energy. Give two reasons
which make the large scale use of nuclear energy prohibitive.
15.
(a)
(b) {H$gr Amhma ûm¥§Ibm _| gm_mÝ`V: VrZ `m Mma nmofr ñVa hr hmoVo h¢ & ì`m»`m
H$s{OE &
O¡d AmdY©Z {H$go H$hVo h¡ ? ì`m»`m H$s{OE &
(a)
(b) A food chain generally has three or four trophic levels. Explain.
What is biological magnification ? Explain.
3
^mJ X
SECTION D
16.
(a)
(b)
(c)
(a)
(b)
(c)
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CZ Xmo YmVwAm| Ho$ Zm_ {b{IE Omo AnZo A`ñH$m| go Ho$db J_© H$aZo na hr àmßV hmo
OmVr h¢ &
qOH$ Ho$ A`ñH$m| H$m CXmhaU boH$a {ZñVmnZ Am¡a ^O©Z Ho$ ~rM {d^oXZ H$s{OE &
W{_©Q> A{^{H«$`m Š`m hmoVr h¡ ? BgH$m _hÎd {b{IE &
Name two metals which are obtained from their ores by simple
heating.
Differentiate between calcination and roasting, taking examples of
zinc ores.
What is thermit reaction ? State its significance.
8
517.
(a)
(b)
(c)
(a)
_oW¡Z AUw H$s BboŠQ´>m°Z - {~ÝXþ g§aMZm It{ME &
ZrMo {XE JE `m¡{JH$m| _| CnpñWV àH$m`m©Ë_H$ g_yhm| H$s nhMmZ H$s{OE :
(i) C 2 H 6 O
(ii) C 2 H 4 O
Am°ŠgrOZ Am¡a EWmBZ Ho$ {_lU H$mo dopëS>¨J _| Obm`m OmVm h¡ & AmnHo$ {dMma go
dopëS>¨J _| EWmBZ Am¡a dm`w Ho$ {_lU H$m Cn`moJ Š`m| Zht {H$`m OmVm ?
AWdm
àË`oH$ àH$aU _| A{^{H«$`m hmoZo Ho$ {bE Amdí`H$ nyar eVmªo H$m C„oI H$aVo hþE
ZrMo {XE JE ê$nmÝVaU H$s{OE :
5
(i)
(b)
EWoZm°b H$mo EWoZm°BH$ Aåb _|
(ii)
EWrZ H$mo EWoZ _|
(iii) EWoZm°b Am¡a EWoZm°BH$ Aåb H$mo EñQ>a _|
Cn`w©º$ g^r ê$nmÝVaUm| H$mo {XE JE Zm_m| H$m C„oI ^r H$s{OE &
gm~wZm| H$s VwbZm _| {S>Q>aOoÝQ>m| (An_mO©H$m|) H$mo àmW{_H$Vm Xr OmVr h¡ & Š`m|
(H$moB© EH$ H$maU Xr{OE)
?
5
(a) Draw electron dot structure of methane molecule.
(b) Identify the functional groups present in the following compounds :
(i) C 2 H 6 O
(ii) C 2 H 4 O
(c) A mixture of oxygen and ethyne is burnt for welding. Why do you
think a mixture of ethyne and air is not used for welding ?
OR
(a) Carry out the following conversions giving complete conditions for
the reaction to take place in each case :
(i) Ethanoic acid from Ethanol
(ii) Ethane from Ethene
(iii) Ester from Ethanoic acid and ethanol
Also state the names given to all the above conversions.
(b)
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Detergents are preferred over soaps. Why ? (Give one reason)
9
P.T.O.18.
(a)
(b)
(c)
(a)
(b)
(c)
(a)
`Ú{n A_r~m Am¡a boí_m{Z`m OZZ H$s g_mZ {dYm Xem©Vo h¡§, naÝVw OZZ H$s
à{H«$`m Ho$ T>§J BZ XmoZm| _| {^Þ - {^Þ h¢ &
BZ XmoZm| ñnrerµO _| OZZ H$s {dYm nhMm{ZE Am¡a BZ_| hmoZo dmbr à{H«$`mAm| H$m
CëboI H$s{OE &
nwZéX²^dZ (nwZO©ZZ) {H$go H$hVo h¢ ? ßboZo[a`m _| `h à{H«$`m {H$g àH$ma hmoVr h¡
AmaoI H$s ghm`Vm go ñnîQ> H$s{OE &
amBµOmong Ho$ Cg ^mJ H$m Zm_ {b{IE {Og_| ~rOmUw ~ZVo h¢ & Cg n[apñW{V H$m
C„oI H$s{OE {Og_| ~rOmUw d¥{Õ H$aHo$ ZE Ord CËnÞ H$aVo h¢ &
AWdm
b¢ {JH$ g§MaU Ûmam OrdmUw O{ZV {H$Ýht Xmo g§H«$_Um| Ho$ Zm_ {b{IE & BZgo ~Mmd
{H$g àH$ma {H$`m Om gH$Vm h¡ ?
Cn`w©º$ (a) _| ~VmE JE Cnm` Ho$ A{V[aº$ AZMmho J^© H$mo amoH$Zo _| ghm`H$ VrZ
AÝ` Cnm`m| H$s gyMr ~ZmBE &
J^©{ZamoYr Cnm`m| H$mo AnZmZo Ho$ VrZ bm^m| H$s gyMr ~ZmBE &
Although Amoeba and Leishmania, both show same mode of
reproduction, but the process of reproduction is carried out in
different ways.
Identify their mode of reproduction and mention the way it is
carried out in the two species.
(b) What is regeneration ? Explain with the help of a diagram how
this process is carried out in Planaria.
(c) Name the part of Rhizopus in which spores are formed.
State the condition under which spores grow into a new individual.
OR
(a) Name any two bacterial infections that are sexually transmitted.
How can they be prevented ?
(b) List three different ways, other than the one stated in (a) above,
that help an individual to avoid unwanted pregnancies.
(c) List three advantages for adopting contraceptive measures.
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5
519.
(a)
(b)
(a)
20.
_|S>b Ho$ à`moJm| H$s ghm`Vm go Xem©BE {H$
(i)
bjU à^mdr Am¡a Aà^mdr hmo gH$Vo h¢, VWm
(ii)
bjU ñdV§Ì ê$n go d§emZwJV hmoVo h¢ &
{Jbhar AWdm {N>nH$br H$s Anojm njr Ed§ M_JmX‹S> Ho$ ~rM g§~§Y A{YH$
K{ZîR> h¢ & {Q>ßnUr H$s{OE &
With the help of Mendel’s experiments show that
(i) traits may be dominant or recessive, and
(ii) traits are inherited independently.
(b) Birds and bats are more closely related to each other than to
squirrels or lizards. Comment.
(a)
(b) h_mao ZoÌ _| CnpñWV nú_m^r no{e`m| H$s ^y{_H$m H$m C„oI H$s{OE &
ZrMo {XE JE àË`oH$ àH$aU _| ÑpîQ> Xmof H$s nhMmZ H$s{OE Am¡a CgHo$ g§emoYZ H$m
Cnm` gwPmBE :
(i)
A{^ZoÌ b|g H$m Xÿ{Y`m `m Y±wYbm hmo OmZm &
(ii)
A{^ZoÌ b§og H$s dH«$Vm H$m AË`{YH$ hmo OmZm &
(iii) A{^ZoÌ b|g H$s \$moH$g Xyar H$m AË`{YH$ hmo OmZm (gm_mÝ` go A{YH$ hmo
OmZm) &
(iv) nú_m^r no{e`m| H$m Xþ~©b hmo OmZm &
AWdm
AmaoI H$s ghm`Vm go AmBµOH$ Ý`yQ>Z Ho$ Cg à`moJ H$s ì`m»`m H$s{OE {Oggo `h
YmaUm AmJo ~‹T>r {H$ gy`© H$m àH$me gmV dUmªo go {_bH$a ~Zm h¡ &
dm`w_§S>br` AndV©Z {H$go H$hVo h¢ ? dm`w_§S>br` AndV©Z na AmYm[aV Xmo
àmH¥${VH$ n[aKQ>ZmAm| H$s gyMr ~ZmBE &
(a)
(b)
(a)
(b)
(a)
(b)
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5
5
State the role of ciliary muscles present in our eye.
Identify the defect of vision in each of the following cases and
suggest its corrective measure :
(i)
The eye lens has become milky and cloudy.
(ii)
The eye lens has excessive curvature.
(iii) The eye lens has large focal length (longer than normal).
(iv) Ciliary muscles have weakened.
OR
With the help of diagram explain Isaac Newton’s experiment that
led to the idea that the sunlight is made up of seven colours.
What is atmospheric refraction ? List two natural phenomena
based on atmospheric refraction.
11
P.T.O.21.
(a)
(b)
(c)
(d)
(a)
(b)
(c)
(d)
Xmo Mwå~H$s` joÌ aoImE± EH$ - Xÿgao H$mo H$^r ^r à{VÀN>o{XV Š`m| Zht H$aVt ? ì`m»`m
H$s{OE &
{H$gr Ymamdmhr n[aZm{bH$m Ho$ ^rVa Ho$ Mwå~H$s` joÌ H$mo EH$g_mZ H$hm OmVm h¡ &
Š`m| ?
âboq_J H$m dm_hñV {Z`_ {b{IE &
ì`mdgm{`H$ _moQ>am| H$s e{º$ _| d¥{Õ H$aZo dmbo Xmo H$maH$m| H$s gyMr ~ZmBE &
5
Why don’t two magnetic field lines ever intersect each other ?
Explain.
‘‘The magnetic field is said to be uniform inside a current carrying
solenoid.’’ Why ?
State Fleming’s left hand rule.
Enlist two factors that enhance the power of commercial motors.
^mJ ¶
SECTION E
22.
VrZ n¥W H²$ naIZ{b`m| _| {bE JE VrZ {^Þ a§JhrZ {db`Zm| X, Y Am¡a Z _| H$moB© N>mÌ
gmd©{ÌH$ gyMH$ H$s Hw$N> ~y±X| {_bmVm h¡, Am¡a `h n«ojU H$aVm h¡ {H$ {db`Z H$m a§J
n[ad{V©V hmoH$a X _| ham, Y _| bmb Am¡a Z _| Zrbm hmo J`m h¡ &
(a)
{db`Zm| X, Y Am¡a Z H$mo CZHo$ pH Ho$ ~‹T> Vo (Amamohr) H«$_ _| ì`dpñWV H$s{OE &
(b)
BZ VrZm| {db`Zm| X, Y Am¡a Z _| go H$m¡Z - gm {db`Z µ\$sZm°ë\$Wo{bZ Ho$ a§J H$mo
n[ad{V©V H$aoJm Am¡a Š`m| ?
AWdm
\o$ag gë\o$Q> Ho$ D$î_r` {d`moOZ Ho$ g_` CËnÞ hmoZo dmbr J¡g Ho$ gånH©$ _|
(a) Jrbm Zrbm {bQ>_g nÌ Am¡a (b) Jrbm bmb {bQ>_g nÌ bmZo na H$moB© N>mÌ Š`m àojU
H$aVm h¡ Am¡a Š`m {ZîH$f© {ZH$mbVm h¡, BgH$m C„oI H$s{OE &
On adding a few drops of universal indicator in three colourless solutions
X, Y and Z taken separately in three test tubes, a student observed the
changes in colour as green in X, red in Y and blue in Z.
(a)
Arrange X, Y and Z in increasing order of their pH values.
(b)
Which one of the three, X, Y and Z, will change the colour of
phenolphthalein ? Why ?
OR
State the observation and inference made by a student when he brings
(i) a wet blue litmus paper and (ii) a wet red litmus paper in contact with
the gas liberated during thermal decomposition of ferrous sulphate.
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2
223.
Mma n¥WH²$ naIZ{b`m§o I, II, III Am¡a IV _o| \o$ag gë\o$Q> H$m \$sH$m ham {db`Z boH$a
naIZ{b`m| , II, III Am¡a IV _| H«$_e: Cu, Zn Am¡a Al Ho$ Qw>H$‹S>o S>mbo JE & {H$g / {H$Z
àH$aU / àH$aUm| _|
(a)
\o$ag gë\o$Q> {db`Z H$m a§J naIZbr (I) Ho$ {db`Z Ho$ a§J go gw_ob H$aoJm ?
H$maU Xr{OE &
(b)
\o$ag gë\o$Q> {db`Z H$m a§J \$sH$m (bwßV) hmo OmEJm VWm YmVwAm| Ho$ n¥îR> na
H$mbm nXmW© {Zjo{nV hmo OmEJm ?
2
A pale green solution of ferrous sulphate was taken in four separate test
tubes marked I, II, III and IV. Pieces of Cu, Zn and Al were dropped in
test tubes II, III and IV respectively. In which case(s)
24.
(a) the colour of ferrous sulphate solution will match with the colour
in test tube (I) ? Give reason.
(b) the colour of ferrous sulphate solution will fade and black mass
will be deposited on the surface of the metal ?
H$moB© N>mÌ {Û~rOnÌr ~rOm| H$mo A§Hw$[aV H$aZm MmhVm h¡ & BgHo$ {bE Mma MaUm| H$mo C{MV
H«$_ _| {b{IE Vm{H$ dh ghr T>§J go à`moJ H$mo H$a gHo$ &
AWdm
ZrMo {XE JE AmaoI H$mo nhMm{ZE Am¡a Bg na A§{H$V ^mJm| A, B Am¡a C Ho$ Zm_ {b{IE :
2
2
A
B
C
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13
P.T.O.A student wants to germinate dicot seeds. Write the four steps in correct
sequence that will help him to perform the experiment in the right way.
OR
Identify the following diagram and name the parts marked as A, B and C :
A
B
C
25.
Xem©B© JB© àm`mo{JH$ ì`dñWm _|,
(a)
bKw naIZbr _| ^ao nXmW© X Am¡a e§ŠdmH$ma âbmñH$ _| Vbr _| aIo nXmW©
Zm_ {b{IE &
(b)
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{ZH$mg Zbr
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Y
31/1/1
14
Y
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2In the experimental set-up shown,
(a)
name the material X filled in the small test tube and the material
Y placed at the bottom of the conical flask.
(b)
why is there a rise in water level in the delivery tube ?
Delivery tube
X
Water
Y
26.
(a)
(b)
(a)
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nmR>çm§H$ Š`m h¡ ?
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h¢ ?
2
In a given ammeter, a student saw that needle indicates
12 th division in ammeter while performing an experiment to verify
Ohm’s law. If ammeter has 10 divisions between 0 to 0·5 A, then
what is the ammeter reading corresponding to 12 th division ?
(b)
How do you connect an ammeter and a voltmeter in an electric
circuit ?
31/1/1
15
P.T.O.27.
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Out of the five incident rays shown in the following diagram, find any two
incident rays that are obeying the laws of refraction of light and may be
used for locating the position of the image formed by a convex lens.
Use these two rays in finding the position, size and nature of the image
formed when an object is placed between F 1 and 2F 1 of a convex lens.
OR
Write four steps in proper sequence which should be followed in the
determination of focal length of a given convex lens by obtaining a sharp
image of a distant object.
31/1/1
16

Balancing Chemical Equations

1. CO₂ + H₂O → C₆H₁₂O₆ + O₂

2. SiCl₄ + H₂O → H₄SiO₄ + HCl

3. Al + HCl → AlCl₃ + H₂

4. Na₂CO₃ + HCl → NaCl + H₂O + CO₂

5. C₇H₆O₂ + O₂ → CO₂ + H₂O

6. Fe₂(SO₄)₃ + KOH → K₂SO₄ + Fe(OH)₃

7. Ca₃(PO₄)₂ + SiO₂ → P₄O₁₀ + CaSiO₃

8. KClO₃ → KClO₄ + KCl

9. Al₂(SO₄)₃ + Ca(OH)₂ → Al(OH)₃ + CaSO₄

10. H₂SO₄ + HI → H₂S + I₂ + H₂O

Complete Solutions:

1. CO₂ + H₂O → C₆H₁₂O₆ + O₂

6CO₂ + H₂O → C₆H₁₂O₆ + O₂

6CO₂ + 6H₂O → C₆H₁₂O₆ + O₂

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

2. SiCl₄ + H₂O → H₄SiO₄ + HCl

SiCl₄ + H₂O → H₄SiO₄ + 4HCl

SiCl₄ + 4H₂O → H₄SiO₄ + 4HCl

SiCl₄ + 4H₂O → H₄SiO₄ + 4HCl

3. Al + HCl → AlCl₃ + H₂

Al + 2HCl → AlCl₃ + H₂

Al + 6HCl → 2AlCl₃ + H₂

2Al + 6HCl → 2AlCl₃ + H₂

2Al + 6HCl → 2AlCl₃ + 3H₂

 

4. Na₂CO₃ + HCl → NaCl + H₂O + CO₂

Na₂CO₃ + HCl → 2NaCl + H₂O + CO₂

Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂

Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂

 

5. C₇H₆O₂ + O₂ → CO₂ + H₂O

C₇H₆O₂ + O₂ → 7CO₂ + H₂O

C₇H₆O₂ + O₂→ 7CO₂ + 3H₂O

C₇H₆O₂ + 7.5O₂ → 7CO₂ + 3H₂O

2C₇H₆O₂ + 15O₂ → 14CO₂ + 6H₂O

6. Fe₂(SO₄)₃ + KOH → K₂SO₄ + Fe(OH)_3­-

Fe₂(SO₄)₃ + KOH → K₂SO₄ + 2Fe(OH)_3­-

Fe₂(SO₄)₃ + KOH → 3K₂SO₄ + 2Fe(OH)_3­-

Fe₂(SO₄)₃ + 6KOH → 3K₂SO₄ + 2Fe(OH)_3­-

 

7. Ca₃(PO₄)₂ + SiO₂ → P₄O₁₀ + CaSiO₃

Ca₃(PO₄)₂ + SiO₂ → P₄O₁₀ + 3CaSiO₃

2Ca₃(PO₄)₂ + SiO₂ → P₄O₁₀ + 3CaSiO₃

2Ca₃(PO₄)₂ + SiO₂ → P₄O₁₀ + 6CaSiO₃

2Ca₃(PO₄)₂ + 6SiO₂ → P₄O₁₀ + 6CaSiO₃

2Ca₃(PO₄)₂ + 6SiO₂ → P₄O₁₀ + 6CaSiO₃

 

8. KClO₃ → KClO₄ + KCl

4KClO₃ → 3KClO₄ + KCl

4KClO₃ → 3KClO₄ + KCl

 

9. Al₂(SO₄)₃ + Ca(OH)₂ → Al(OH)₃ + CaSO₄

Al₂(SO₄)₃ + Ca(OH)₂ → 2Al(OH)₃ + CaSO₄

Al₂(SO₄)₃ + Ca(OH)₂ → 2Al(OH)₃ + 3CaSO₄

Al₂(SO₄)₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaSO₄

Al₂(SO₄)₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaSO₄

 

10. H₂SO₄ + HI → H₂S + I₂ + H₂O

H₂SO₄ + HI → H₂S + I₂ + 4H₂O

H₂SO₄ + 2HI → H₂S + I₂ + 4H₂O

H₂SO₄ + 8HI → H₂S + I₂ + 4H₂O

H₂SO₄ + 8HI → H₂S + 4I₂ + 4H₂O

11. P₄O₁₀ + H₂O → H₃PO₄

P₄O₁₀ + H₂O → 4 H₃PO₄

P₄O₁₀ + 6 H₂O → 4 H₃PO₄

1. 1 SnO₂ + 2 H₂ → 1 Sn + 2 H₂O
2. 3 KOH + 1 H₃PO₄ → 1 K₃PO₄ + 3 H₂O
3. 2 KNO₃ + 1 H₂CO₃ → 1 K₂CO₃ + 2 HNO₃
4. 1 Na₃PO₄ + 3 HCl → 3 NaCl + 1 H₃PO₄
5. 1 TiCl₄ + 2 H₂O → 1 TiO₂ + 4 HCl
6. 1 C₂H₆O + 3 O₂ → 2 CO₂ + 3 H₂O
7. 2 Fe + 6 HC₂H₃O₂ → 2 Fe(C₂H₃O₂)₃ + 3 H₂
8. 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O
9. 1 B₂Br₆ + 6 HNO₃ → 2 B(NO₃)₃ + 6 HBr
10. 4 NH₄OH + 1 Kal(SO₄)₂·12H₂O → 1 Al(OH)₃ + 2 (NH₄)₂SO₄ + 1 KOH + 12 H₂O 

 

_{2Fe2O3+3C--->4Fe+3CO2
2)H2SO4+CaCO3--->CaSO4+H2CO3
3) 2H2+02--->2H20
4) CH3COOH+C2H5OH ---> CH3COOC2H5+H2O
5) 1 AgNO3 + 1 LiOH --> 1 AgOH + 1 LiNO3
6) CH4+2O2--->CO2+2H2O.
7) Sn+2H2SO4-->SnSO4+2H2O+SO2
8) CuO+H2SO4--->CuSO4+H2
9) Mg3N2 + 3H2O ---> 3MgO + 2NH3
10) N2 + O2 ---> 2 NO
11) 2 CH4 + 3 O2 ---> 2 CO + 4 H2O
12) 6 CO2 + 6 H2O ---> C6H12O6 + 6 O2
13) 2 AgI + Na2S ---> Ag2S + 2 NaI
14) Ba3N2 + 6 H2O --->3 Ba(OH)2 + 2 NH3
15) 4 FeS + 7 O2 --->2 Fe2O3 + 4 SO2
16) PCl5 + 4 H2O ---> H3PO4 + 5 HCl
17) 3 CaCl2 + 2 Na3PO4--->Ca3(PO4)2 + 6 NaCl
18) 2 As + 6 NaOH --->2 Na3AsO3 + 3 H2
19) 12 HClO4 + P4O10 ---> 4 H3PO4 + 6 Cl2O7
20) 10 KClO3 + 3 P4 ---> 3 P4O10 + 10 KCl
21) SnO2 + 2 H2 ---> Sn + 2 H2O
22) 3 KOH + H3PO4 ---> K3PO4 + 3 H2O
23) 3 Hg(OH)2 + 2 H3PO4 ---> Hg3(PO4)2 + 6 H2O
24) 2 KNO3 + H2CO3 ---> K2CO3 + 2 HNO3
25) Na3PO4 + 3 HCl ---> 3 NaCl + H3PO4
26) TiCl4 + 2 H2O ---> TiO2 + 4 HCl
27) C2H6O + 3 O2 ---> 2 CO2 + 3 H2O
28 4 NH3 + 5 O2 ---> 4 NO + 6 H2O
29) B2Br6 + 6 HNO3 ---> 2 B(NO3)3 + 6 HBr
30) 8 CO + 17 H2 ---> C8H18 + 8 H2O
31) 4 NH4OH + KAl(SO4)212H2O ---> Al(OH)3 + 2 (NH4)2SO4 + KOH + 12 H2O
32) 2 Fe + 6 HC2H3O2 ---> 2 Fe(C2H3O2)3 + 3 H2
33) N2+3H2--->2NH3
34) N2 + 3H2 ---> 2NH3
35) Al2O3+3H2SO4--->Al2(SO4)3 +3H2O
36) HCl+NH3--->NH4Cl
37) 2Na + 2H2O = 2NaOH + H2
38) C6H12O6--->6C+6H2O
39) CuO+H2SO4--->CuSO4+H2
40) COH12O6--->2CO2+2C2H5OH
41) FeCl3+Fe2O3--->3FeOCl
42) NaCl+AgNO3--->NaNO3+AgCl
43) HCl+NH3--->NH4Cl
44) 2Al+6HCl--->2AlCl3+3H2
45) Ca + 2HCl = CaCl2 + H2
46) CaCO3 + H2SO4 = CaSO4 + H20 + CO2
47) 3H2SO4 + 2Fe ---> Fe2(SO4)3 + 3H2
48) Mg3N2 + 3H2O ---> 3MgO + 2NH3
49) CH4+ O2 ---> CO2 + H2O
50) Cl2 + SO2 + H2O ---> HCl + H2SO4}

 

1. What do you mean by Bt?

 Bacillus thuringiensis (Bt) is a species of bacteria that lives in soil. It makes proteins that are toxic to some insects when eaten, but not others. The proteins are not toxic to humans because, like all mammals, we cannot activate them. Bt is not toxic to non-target wildlife. However, one type of Bt (aizawi) can be toxic to honeybees. Bt is used as an insecticide, typically, for insect larvae. Remember, it has to be eaten to work.

M1-R4 : IT TOOLS & BUSINESS SYSTEMS : July 2021

Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the "OMR" answer sheet supplied with the question paper, following instructions therein.

(1x10)

1.1 SaveAs dialog box can be used :

(A) for saving the file for the first time

(B) to save file by some alternative name

(C) to save file in a format other than Word

(D) all of the above

1.2 Non-impact based printing device is :

(A) Dot-Matric Printer

(B) Scanner

(C) Laser Printer

(D) None of the above

1.3 To cut text from the document, press the keys

(A) Ctrl and V

(B) Ctrl and C

(C) Ctrl and A

(D) Ctrl and X

1.4 __________ maps IP addresses with the domain names of the sites.

(A) URL

(B) DNS

(C) FTP

(D) None of the above

1.5 A Nibble consists of __________ Bits.

(A) 2

(B) 4

(C) 8

(D) 16

1.6 User interact with the operating system through a set of __________.

(A) USB Sticks

(B) Commands

(C) Scanner

(D) All of the above

1.7 Which is the technology used in the evaluation of aptitude test ?

(A) OCR

(B) OMR

(C) MICR

(D) MCR

1.8 To create a Paragraph Break in MS-WORD, which key is used ?

(A) Enter

(B) Esc

(C) Tab

(D) Shift

1.9 MIDI means :

(A) Multimedia Instrument Digital Information

(B) Multimedia Instrument Digital Interface

(C) Musical Instrument Digital Interface

(D) Musical Information Information

1.10. Full form of ASCII :

(A) American Standard Code for Information Interconnection

(B) American Situation Code for Information Intercommunication

(C) American Standard Code for Information Interchange

(D) American Standard Coding for Information Interconnection

 

2. Each statement below is either TRUE or FALSE. Choose the most appropriate one and enter your choice in the "OMR" answer sheet supplied with the question paper, following instructions therein.

(1x10)

2.1 IPv6 Internet Protocol address is represented as eight groups of four Octal digits.

2.2 There are only two types of page orientation - portrait and landscape.

2.3 Internet is a network of networks.

2.4 MIDI means Multimedia Instrument Digital Interface.

2.5 MICR stands for Magnetic Ink Character Reader.

2.6 Peripheral is an external device connected to the computer, such as input and output devices and external storage devices.

2.7 We can get back the deleted files/folders from the Recycle bin.

2.8 ALU is not a part of CPU.

2.9 Results are automatically recalculated by a formula if the data is changed in a given cell of worksheet.

2.10 Database can contain table, query and report.

 

3. Match words and phrases in column X with the closest related meaning/word(s)/phrases in column Y. Enter your selection in the "OMR" answer sheet supplied with the question paper, following instructions therein.

(1x10)

X		Y
3.1	Popular RDBMS	(A)	Protocol
3.2	Number system to the base 2	(B)	Ctrl + w
3.3	Set of Rule	(C)	Binary
3.4	Shortcut to Close a document.	(D)	Octal
3.5	A type of file system in Windows operating system	(E)	Internet
3.6	Any part of the computer that you can physically touch	(F)	Functions
3.7	The arranging of data in a logical sequence is called :	(G)	Sorting
3.8	Readymade formulas of Excel	(H)	Software
3.9	Global system of interconnected computer networks.	(I)	Hardware
3.10	Facility can automatically rectify common spelling mistakes and often-used acronyms, etc.	(J)	Auto Right
		(K)	Auto correct
		(L)	NTFS
		(M)	ORACLE

4. Each statement below has a blank space to fit one of the word(s) or phrase(s) in the list below. Choose the most appropriate option, enter your choice in the "OMR" answer sheet supplied with the question paper, following instructions therein.

(1x10)

(A)	F12	(B)	Cut/Copied	(C)	Home
(D)	IT Act	(E)	Tables & Query	(F)	Control
(G)	Cyber crime	(H)	F2	(I)	Autosum
(J)	Hard disk Drive	(K)	Mailbox	(M)	Link
(L)	End

4.1 _________ deals with cybercrime and electronic commerce.

4.2 Relational Database contains ________.

4.3 The ________ tab is to take you to first page of website.

4.4 Inventory ________ is concerned with minimizing the total cost of inventory.

4.5 ________ is used in MS-Excel to total rows and/or columns.

4.6 Save As dialog box is open by pressing ________ key.

4.7 A Clipboard is a temporary storage area used for text which is ________.

4.8 _________ an area of memory or disk that is assigned to store e-mail messages sent by

other users.

4.9 ________ is both an Input-Output device.

4.10 Foreign Key is used to ________ the given table with other table.

 

5. (a) What is the difference between function and formula in Excel ? Provide example. Explain the working of the functions with

example: count, max, if, sort in worksheet.

(b) Enumerate the components of multimedia and explain in brief. Enlist the commonly used file formats of multimedia files.

(8+7)

6.

(a) Convert (2565)₈ to Hexadecimal number.

(b) Differentiate between DDL and DML.

(c) Discuss the role of Information Technology in the field of Education.

(5+5+5)

7.

(a) Why are high level languages known as machine independent ?

(b) What is the need of database Management System ? Give three examples of popular database management systems.

(c) Compare all three : Compiler, Interpreter and Assembler.

(5+6+4)

8.

(a) What is Personal Information System (PIS) and what are its functions ?

(b) Explain the application of Multimedia in E-learning.

(c) Explain the need of Operating System in a computer. What is the role of Kernel and Shell in LINUX Operating System ?

(5+5+5)

9.

(a) Differentiate between Open Source Software and Proprietary Software.

(b) Explain common characteristic of the computer.

(c) Differentiate between SPAM and VIRUS.

(5+5+5)

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