CBSE Class 10 Question Paper 2022 Science (Solved)

SET-1
Series QQARR/1 àíZ-nÌ H$moS>
Q.P. Code 31/1/1
amob Z§. narjmWu àíZ-nÌ H$moS> >H$mo CÎma-nwpñVH$m Ho$
Roll No. _wI-n¥ð >na Adí` {bIo§ &
Candidates must write the Q.P. Code
on the title page of the answer-book.

H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 11 h¢ &
àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE àíZ-nÌ H$moS> H$mo narjmWu CÎma-nwpñVH$m Ho$ _wI-n¥ð>
na {bI| &
H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >15 àíZ h¢ &
H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$ Adí`
{bI| &
Bg àíZ-nÌ 15 {_ZQ >H$m g_` {X`m J`m h¡ & àíZ-
_| 10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-
Am¡a Bg Ad{Y Ho$ Xm¡amZ do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
Please check that this question paper contains 11 printed pages.
Q.P. Code given on the right hand side of the question paper should be
written on the title page of the answer-book by the candidate.
Please check that this question paper contains 15 questions.
Please write down the serial number of the question in the
answer-book before attempting it.
15 minute time has been allotted to read this question paper. The question
paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the
students will read the question paper only and will not write any answer on
the answer-book during this period.

{dkmZ
SCIENCE

:2 : 40
Time allowed : 2 hours Maximum Marks : 40

31/1/1 1 P.T.O.

:

:
(i) 15
(ii)
(iii) 1 7 2
(iv) 8 13 3
(v) 14 15 4
(vi)

IÊS> H$

1. (H$) ZrMo {XE JE H$m~©Z Ho$ `m¡{JH$m| Ho$ AmpÊdH$ gyÌ {b{IE :
(i) _oWoZ
(ii) àmonoZ
(I) ? 2

2. Xmo VÎdm| X Am¡a Y >m°Z VrZ H$moem| _| {d^m{OV h¢ VWm BZHo$ ~møV_
1 Am¡a 7 &
(H$) BZ VÎdm| H$s AmYw{ZH$ AmdV© gmaUr _| g_yh g§»`m {b{IE &
(I) X Am¡a Y Ho$ g§`moJ go ~ZZo dmbo `m¡{JH$ H$m AmpÊdH$ gyÌ {b{IE &
(J) BZ XmoZm| VÎdm| _| go H$m¡Z-gm {dÚwV-YZmË_H$ h¡ ? 2

3. (H$) ZrMo {XE JE nwî h¡ ?

(I) C^`qbJr nwîn Ho$ Xmo OZZm§Jm| H$s gyMr ~ZmBE & 2

4. Xmo ~hþH$mo{eH$ Ordm| ñnmBamoJm`am Am¡a ßboZo[a`m _| go H$m¡Z nwZO©ZZ (nwZéX²^dZ) Ûmam
? {H$gr EH$ AÝ` Eogo Ord H$m CXmhaU Xr{OE Omo Bgr à{H«$`m
Ûmam OZZ H$a gH$Vm h¡ & 2
31/1/1 2

General Instructions :
Read the following instructions very carefully and strictly follow them :
(i) This question paper comprises 15 questions. All questions are compulsory.
(ii) This question paper is divided into three sections A, B and C.
(iii) Section A Questions No. 1 to 7 are short answer type questions. Each
question carries 2 marks.
(iv) Section B Questions No. 8 to 13 are also short answer type questions. Each
question carries 3 marks.
(v) Section C Questions No. 14 and 15 are case-based questions. Each question
carries 4 marks.
(vi) Internal choices have been provided in some questions. Only one of the
alternatives has to be attempted.

SECTION A

1. (a) Write the molecular formula of the following carbon compounds :
(i) Methane
(ii) Propane
(b) Carbon compounds have low melting and boiling points. Why ? 2

2. The electrons in the atoms of two elements X and Y are distributed in
three shells having 1 and 7 electrons respectively in their outermost
shells.
(a) Write the group numbers of these elements in the Modern Periodic
Table.
(b) Write the molecular formula of the compound formed when X and
Y combine with each other.
(c) Which of the two is electropositive ? 2

3. (a) Which of the following flowers will have higher possibility of
self-pollination ?
Mustard, Papaya, Watermelon, Hibiscus
(b) List the two reproductive parts of a bisexual flower. 2

4. Which one of the two multicellular organisms Spirogyra and Planaria
reproduces by regeneration and why ? Give an example of any other
organism which can also reproduce by the same process. 2
31/1/1 3 P.T.O.

5. (H$) {d{^ÞVm {H$go H$hVo h¢ ? CZ Xmo à_wI H$maUm| H$s gyMr ~ZmBE {OZHo$ H$maU {H$gr
g_{ï> _| {d{^ÞVm CËnÞ hmoVr h¡ & 2
AWdm
(I) (i) ~¢JZr nwînm| dmbo nm¡Ym| Am¡a ídoV nwînm| dmbo nm¡Ym| Ho$ _Ü` g§H$aU Ûmam
CËnÞ F1 g§V{V Ho$ nm¡Ym| Ho$
(ii) `{X F1 g§V{V Ho$ nm¡Ym| H$m ñdnamJU H$am`m OmE, Vmo F2 g§V{V Ho$ nm¡Ym| _|
àojU hm|Jo ?
(iii) `{X F2 g§V{V _| 100 nm¡Yo àmßV hmoVo h¢, Vmo CZ_| go {H$VZo nm¡Yo Aà^mdr
bjU Xem©E±Jo ? 2

6. (H$) (i) Cg {Z`_ H$m Zm_ Am¡a dh {Z`_ {b{IE Omo {H$gr EH$g_mZ Mwå~H$s`
joÌ _| joÌ Ho$ bå~dV² {H$gr Ymamdmhr grYo MmbH$ na bJZo dmbo ~b H$s
{Xem {ZYm©[aV H$aVm h¡ &
(ii) H$moB© Eoë\$m H$U {H$gr Mwå~H$s` joÌ _| JwµOaVo g_` CÎma {Xem _| à{jßV
µOaVm h¡, Vmo dh
{H$g {Xem _| à{jßV hmoJm ? 2
AWdm
(I) (i) n[aZm{bH$m {H$go H$hVo h¢ ?
(ii) {H$gr n[aZm{bH$m {Oggo H$moB© ñWm`r Ymam àdm{hV hmo ahr h¡, Ho$ Mwå~H$s`
joÌ H$s Mwå~H$s` joÌ aoImAm| H$m n¡Q>Z© It{ME & 2

7. (H$) Amo ? m| na `h {H$g àH$ma {Z{_©V
hmoVr h¡ ? AmoµOmoZ h_mao nm[aV§Ì H$mo {H$g àH$ma à^m{dV H$aVr h¡ ? 2
AWdm
(I) (i) Xmo _mZd-{Z{_©V nm[aV§Ìm| H$s gyMr ~ZmBE & 1

(ii) h_ {H$gr Vmbm~ H$s g\$mB© Cg T>§J go Zht H$aVo h¢ {Og T>§J go h_
AnZr ObOrdembm H$s g\$mB© H$aVo h¢ & Bg H$WZ H$s H$maU g{hV nw{ï>
H$s{OE & 1

31/1/1 4

5. (a) What is variation ? List two main reasons that may lead to
variation in a population. 2
OR
(b) (i) In a cross between violet flowered plants and white flowered
plants, state the characteristics of the plants obtained in the
F1 progeny.

(ii) If the plants of F1 progeny are self-pollinated, then what
would be observed in the plants of F2 progeny ?

(iii) If 100 plants are produced in F2 progeny, then how many
plants will show the recessive trait ? 2

6. (a) (i) Name and state the rule to determine the direction of force
experienced by a current carrying straight conductor placed
in a uniform magnetic field which is perpendicular to it.

(ii) An alpha particle while passing through a magnetic field gets
projected towards north. In which direction will an electron
project when it passes through the same magnetic field ? 2
OR
(b) (i) What is a solenoid ?

(ii) Draw the pattern of magnetic field lines of the magnetic
field produced by a solenoid through which a steady current
flows. 2

7. (a) What is ozone ? How is it formed in the upper layers of the E
atmosphere ? How does ozone affect our ecosystem ? 2
OR
(b) (i) List two human-made ecosystems. 1

(ii)
nt. 1

31/1/1 5 P.T.O.

IÊS> I
8. (H$) AmYw{ZH$ AmdV© gmaUr _| {H$gr VÎd H$s na_mUw g§»`m H$mo VÎdm| Ho$ dJuH$aU Ho$
AmYma Ho$ ê$n _| AnZmZo Ho$ Xmo bm^m| H$s gyMr ~ZmBE &
(I) VÎdm| X (na_mUw g§»`m 13) Am¡a Y (na_mUw g§»`m 20
{b{IE & 3

9. (H$) Cg g§V¥ßV hmBS´>moH$m°~©Z, {OgHo$ AUw _| Mma H$m~©Z na_mUw h¢, H$s g§^m{dV Xmo
{d{^Þ g§aMZmE± It{ME & g_mZ AmpÊdH$ gyÌ Ho$ Bg hmBS´>moH$m~©Z H$s Xmo
? Bg `m¡{JH$ H$m gm_mÝ` Zm_ Am¡a AmpÊdH$ gyÌ
{b{IE & Bg `m¡{JH$ Ho$ EoëH$mBZ H$m AmpÊdH$ gyÌ {b{IE & 3
AWdm
(I) (i) ~oݵOrZ H$m AmpÊdH$ gyÌ {b{IE Am¡a BgH$s g§aMZm It{ME &
(ii) ~oݵOrZ Ho$ AUw _| CnpñWV EH$b ghg§`moOr Am~ÝYm| Am¡a {Û ghg§`moOr
Am~ÝYm| H$s g§»`m {b{IE &
(iii) {H$Z `m¡{JH$m| H$mo EoëH$mBZ H$hVo h¢ ? 3

10. (H$) _mZd Za OZZ V§Ì Ho$ ZrMo {XE JE àË`oH$ A§J H$m EH$-EH$ H$m`© {b{IE :
(i) d¥fU
(ii) d¥fU H$moe
(iii) ewH«$dm{hZr$
(iv) àm°ñQ>oQ> J«§{W
(I) Cg OZZ-H$mo{eH$m Ho$ àH$ma H$m Zm_ {b{IE (i) Omo J{Verb hmoVr h¡ VWm
(ii) {Og_| ^moOZ H$m ^§S>ma g§{MV hmoVm h¡ & 3

11. (H$) VrZ à{VamoYH$ R1, R2 Am¡a R3 nmíd© _| g§`mo{OV h¢ Am¡a `h g§`moOZ EH$ ~¡Q>ar,
EH$ Eo_rQ>a, EH$ dmoëQ>_rQ>a VWm EH$
ì`dñWm H$mo Xem©Zo Ho$ {bE Cn`wº$ n[anW AmaoI It{ME Am¡a {dÚwV² Ymam Ho$ àdmh
H$s {Xem H$mo Xem©BE &
(I) ZrMo {XE JE ZoQ>dH©$ H$m Vwë` à{VamoY n[aH${bV H$s{OE : 3

31/1/1 6

SECTION B
8. (a) List two advantages of adopting the atomic number of an element
as the basis of classification of elements in the Modern Periodic
Table.
(b) Write the electronic configurations of the elements X (atomic
number 13) and Y (atomic number 20). 3
9. (a) Draw two different possible structures of a saturated hydrocarbon
having four carbon atoms in its molecule. What are these two
structures of the hydrocarbon having same molecular formula
called ? Write the molecular formula and the common name of this
compound. Also write the molecular formula of its alkyne. 3
OR
(b) (i) Write the molecular formula of benzene and draw its
structure.
(ii) Write the number of single and double covalent bonds
present in a molecule of benzene.
(iii) Which compounds are called alkynes ? 3

10. (a) Mention one function each of the following organs in human male
reproductive system :
(i) Testis
(ii) Scrotum
(iii) Vas deferens
(iv) Prostate gland
(b) Name the type of germ cell which (i) is motile, and (ii) stores food. 3

11. (a) Three resistors R1, R2 and R3 are connected in parallel and the
combination is connected to a battery, an ammeter, a voltmeter
and a key. Draw suitable circuit diagram to show the arrangement
of these circuit components along with the direction of current
flowing.
(b) Calculate the equivalent resistance of the following network : 3

31/1/1 7 P.T.O.

1 1
12. (H$) (i) {dÚwV² e{º$ H$s n[a^mfm Xr{OE Am¡a BgH$m SI _mÌH$ {b{IE & +
2 2
(ii) 100 W; 220 V Am¡a 60 W; 220 V AZw_Vm§H$ Ho$ Xmo ~ë~ 220 V Ho$
{H$gr {dÚwV² _oÝg go nmíd© _| g§`mo{OV h¢ & ~ë~m| Ûmam _oÝg go br JB©
{dÚwV Ymam kmV H$s{OE & 2
AWdm
(I) (i) Oyb H$m VmnZ {Z`_ {b{IE & Bgo J{UVr` ê$n _| Cg n[apñW{V _| ì`º$
H$s{OE {Og_| à{VamoY R H$s H$moB© `w{º$ {H$gr V dmoëQ>Vm Ho$ òmoV go
g§`mo{OV h¡ VWm Cggo g_` t Ho$ {bE Ymam I àdm{hV hmoVr h¡ &
(ii) H$moB© à{VamoYH$ {OgH$m à{VamoY 5 h¡, 6 dmoëQ> H$s {H$gr ~¡Q>ar Ho$ {gam| go
g§`mo{OV h¡ & 10 goH$ÊS> _| D$î_m Ho$ ê$n _| j{`V D$Om© n[aH${bV H$s{OE & 3
13. (H$) Ordm| Ho$ Cg g_yh H$m Zm_ {b{IE {OZgo g^r Amhma ûm§¥IbmAm| H$m nhbm nmofr
?
(I) _mZd O¡d- o h¢ ?
(J) {H$gr àmH¥${VH$ nm[aV§Ì go An_mO©H$m| (AnKQ>H$m|) H$s AZwnpñW{V H$m EH$
Xþîn[aUm_ {b{IE & 3

IÊS> J
2 14 15 3

14. dh à{H«$`m {OgHo$ Ûmam {H$gr ì`{ï> H$m qbJ {ZYm©[aV hmoVm h¡, qbJ-{ZYm©aU H$hVo h¢ &
_mZdm| _| {H$gr ZdOmV H$m qbJ-{ZYm©aU AmZwd§{eH$ AmYma na {H$`m OmVm h¡, O~{H$ Hw$N>
AÝ` _| Eogm Zht hmoVm h¡ & _mZdm| _| 46 (23 JwUgyÌ hmoVo h¢ & BZ_| go
44 (22
H$mo qbJ JwUgyÌ H$hVo h¢ & qbJ JwUgyÌ Xmo àH$ma Ho$ hmoVo h¢ X JwUgyÌ Am¡a
Y JwUgyÌ & {ZfoMZ Ho$ g_` ZdOmV {eew H$m qbJ {ZYm©aU Bg VÏ` na {Z^©a H$aVm h¡
{H$ Za `w½_H$ H$m H$m¡Z-gm àH$ma _mXm `w½_H$ Ho$ gmW g§b`Z H$aVm h¡ &
(H$) _mZdm| , àH$ma Am¡a gmBµO
1 1
Zht hmoVm h¡ ? +
2 2
(I) Za Am¡a _mXm _| go {H$g_| qbJ JwU ?n H$s
pñW{V moZo dmbo `w½_H$ EH$ hr àH$ma Ho$ hm|Jo AWdm {^Þ
àH$ma Ho$ hm|Jo ? 1
31/1/1 8

1 1
12. (a) (i) Define Electric Power and write its SI unit. +
2 2
(ii) Two bulbs rated 100 W; 220 V and 60 W; 220 V are
connected in parallel to an electric mains of 220 V. Find the
current drawn by the bulbs from the mains. 2
OR
(b) (i)
an appliance of resistance R is connected to a source of voltage
V and the current I flows through the appliance for a time t.
(ii) A 5 resistor is connected across a battery of 6 volts.
Calculate the energy that dissipates as heat in 10 s. 3

13. (a) Name the group of organisms which form in the first trophic level
of all food chains. Why are they called so ?
(b) Why are the human beings most adversely affected by
bio-magnification ?
(c) State one ill-effect of the absence of decomposers from a natural
ecosystem. 3

SECTION C

This section has 2 case-based questions (14 and 15). Each case is followed by
3 sub-questions (a), (b) and (c). Parts (a) and (b) are compulsory. However, an
internal choice has been provided in Part (c).

14. The mechanism by which the sex of an individual is determined is called
sex-determination. In human beings, sex of a newborn is genetically
determined, whereas in some others it is not. There are 46 (23 pairs)
chromosomes in human beings. Out of these, 44 (22 pairs) control the
body characters and 2 (one pair) are known as sex chromosomes. The sex
chromosomes are of two types X chromosome and Y chromosome. At
the time of fertilisation, depending upon which type of male gamete fuses
with the female gamete, the sex of the newborn child is decided.
(a) Why is a pair of sex chromosomes in human beings called a
1 1
mismatched pair in terms of type and size ? +
2 2
(b) Out of male or female, which of them has a perfect pair of sex
chromosomes ? In case of a perfect pair, will the gametes produced
be of the same kind or of a different kind ? 1
31/1/1 9 P.T.O.

(J) (i) CZ Xmo Ordm| Ho$ Zm_ {b{IE {OZH$m qbJ {ZYm©aU AmZwd§{eH$ AmYma na
Zht hmoVm & BZHo$ qbJ {ZYm©aU H$s à{H«$`m H$s ì`m»`m H$s{OE & 1+1
AWdm
(ii) Ho$db àdmh AmaoI H$s ghm`Vm go, `h Xem©BE {H$ _mZdm| _| AmZwd§{eH$
ê$n go qbJ {ZYm©aU {H$g àH$ma hmoVm h¡ & 1+1

15. H$moB© N>mÌm {H$gr {Mn{Mno nXmW© H$m Cn`moJ H$aHo$ S´>mB§J ~moS>© na EH$ g\o$X H$mJµO H$s erQ>
bJmVr h¡ & dh BgHo$ ~rMm|- r h¡ VWm Bg N>
Amoa, Z_H$-{N>VamdH$ H$m Cn`moJ H$aHo$, EH$g_mZ ê$n go Hw$N> bm¡h-MyU© {N>VamVr h¡ & ~moS>©
H$mo Yrao-Yrao WnWnmZo na dh `h àojU H$aVr h¡ {H$ bm¡h-MyU© ñd`§ hr EH$ {deof n¡Q>Z© _|
ì`dpñWV hmo J`m h¡ &
(H$) bm¡h-MyU© Ho$ Bg n¡Q>Z© H$mo Xem©Zo Ho$ {bE AmaoI It{ME & 1

(I)
Mwå~H$ Ho$ Y«wdm| Am¡a Mwå~H$s` joÌ aoImAm| H$s {Xem Xem©BE & 1

(J) (i) {H$gr {~ÝXþ na Mwå~H$s` joÌ H$s {Xem joÌ aoImAm| H$m Cn`moJ H$aHo$ {H$g
àH$ma kmV H$s OmVr h¡ ? Xmo Mwå~H$s` joÌ aoImE± EH$-Xÿgao H$m à{VÀN>oXZ
? 2
AWdm
(ii) N>moQ>r {X
H¡$go ItMr OmVr h¢ ? Mwå~H$ Ho$ XmoZm| Amoa EH$-EH$ Mwå~H$s` joÌ aoIm
It{ME & 2

31/1/1 10

(c) (i) Name two animals whose sex is not genetically determined.
Explain the process of their sex determination. 1+1
OR
(ii) With the help of a flowchart only, show how sex is
genetically determined in human beings. 1+1

15. A student fixes a sheet of white paper on a drawing board using some
adhesive materials. She places a bar magnet in the centre of it and
sprinkles some iron filings uniformly around the bar magnet using a
salt-sprinkler. On tapping the board gently, she observes that the iron
filings have arranged themselves in a particular pattern.
(a) Draw a diagram to show this pattern of iron filings. 1
(b) Draw the magnetic field lines of a bar magnet showing the poles of
the bar magnet as well as the direction of the magnetic field lines. 1
(c) (i) How is the direction of magnetic field at a point determined
using the field lines ? Why do two magnetic field lines not
cross each other ? 2
OR
(ii) How are the magnetic field lines of a bar magnet drawn
using a small compass needle ? Draw one magnetic field line
each on both sides of the magnet. 2

31/1/1 11 P.T.O.