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$m`© {b{IE &
B
A
Write the name and one function each of the parts A and B shown in the
following diagram.
B
A
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P.T.O.5.
àH$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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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)
{ZH$mg Zbr _| Ob H$m ñVa D$na Š`m| CR> OmVm h¡ ?
{ZH$mg Zbr
X
Ob
Y
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14
Y
H$m
2In the experimental set-up shown,
(a)
name the material X filled in the small test tube and the material
Y placed at the bottom of the conical flask.
(b)
why is there a rise in water level in the delivery tube ?
Delivery tube
X
Water
Y
26.
(a)
(b)
(a)
{H$gr N>mÌ Zo Amo_ Ho$ {Z`_ H$mo gË`m{nV H$aZo Ho$ à`moJ _| `h nm`m {H$ {XE JE
Eo_rQ>a _| Eo_rQ>a H$s gwB© 12 d| A§e H$mo B§{JV H$a ahr h¡ & `{X Bg Eo_rQ>a _|
0 go 0·5 A Ho$ ~rM 10 {d^mOZ h¢, Vmo 12 d| {d^mOZ Ho$ VXZê$n Eo_rQ>a H$m
nmR>çm§H$ Š`m h¡ ?
Amn {H$gr {dÚwV² n[anW _| Eo_rQ>a Am¡a dmoëQ>_rQ>a H$mo {H$g àH$ma g§`mo{OV H$aVo
h¢ ?
2
In a given ammeter, a student saw that needle indicates
12 th division in ammeter while performing an experiment to verify
Ohm’s law. If ammeter has 10 divisions between 0 to 0·5 A, then
what is the ammeter reading corresponding to 12 th division ?
(b)
How do you connect an ammeter and a voltmeter in an electric
circuit ?
31/1/1
15
P.T.O.27.
ZrMo {XE JE AmaoI _| Xem©B© JB© nm±M Amn{VV {H$aUm| _| go {H$Ýht Xmo Amn{VV {H$aUm| H$mo
kmV H$s{OE Omo àH$me Ho$ AndV©Z Ho$ {Z`_m| H$m nmbZ H$aVo hþE ItMr JB© h¢ Am¡a {OZH$m
Cn`moJ {H$gr CÎmb b|g Ûmam ~Zo à{V{~å~ H$s pñW{V kmV H$aZo _| {H$`m Om gH$Vm h¡ &
BZ Xmo {H$aUm| H$m Cn`moJ {H$gr CÎmb b|g Ho$ F 1 d 2F 1 Ho$ ~rM pñWV {H$gr {~å~ Ho$
à{V{~å~ H$s pñW{V, gmBµO Am¡a àH¥${V kmV H$aZo _| H$s{OE & 2
AWdm
CZ Mma MaUm| H$mo C{MV H«$_ _| {b{IE {OZH$m nmbZ {H$gr XÿañW {~å~ H$m {H$gr {XE
JE CÎmb b|g Ûmam VrúU à{V{~å~ à«mßV H$aHo$ CgH$s \$moH$g Xÿar {ZYm©[aV H$aZo _| {H$`m
OmZm Mm{hE & 2
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
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