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SECTION- A
1) Which processis usedin washing machine to squeeze(rinse)
water from clothes?2) Name the types ofsimple tissues.3) What is
the value of g at thecentre ofearth?4) Name the physicalquantity
corresponds to rate ofchange of momentum.5) What do you mean by
saturatedsolution?6) Why does our palm feelcold when we put some
acetone or petrol onit?7) Give two reasons to support that water is
a compound andnot a mixture.8) If the moon attracts the Earth, why
doesheearthnot move towards the moon?9) Explain why some of
theleaves may get detached from a treeif we vigorously shakeits
branch?
10)What are the values ofdistance anddisplacement incovering 10
m from P to Q andcoming back?
11)State any two conditionsnecessary for goodhealth.12)
What are functions ofstomata?13)Which organelleis known as the
powerhouse of thecell?Why?
14)Differentiate between mixture andcompound.15)What
ischromatography?Writeits any two applications.16)A
solutioncontains 5 mL alcoholin 70 mL of water. Calculate the
volume by volume
percentage ofsolution.
17)Write thedifferences between mass and weight.18)From a rifle
of mass 4 kg, a bucket of mass 50 gis fired with aninitial velocity
of 35 m/s.
Calculate theinitial recoil velocity of the rifle.
19)Why isit difficult to hold a school baghavingstrap made of
thin andstrongstring?20)Draw a labelleddiagram ofneuron.21)What
isimmunization?What are theimmunization programmes available at
the
nearest healthcentrein your locality?
22)Differentiate between osmosis anddiffusion.23)Write
thedifferences betweensolid,liquid andgas.
Or
What is factionaldistillation?Whenit is used? Explain with an
activity.
24)Thegraphshows thespeed of a car changes with time:(a)What
isinitialspeed ofcar?(b)What is maximum speed attained by car?(c)
Which part ofgraphshowszero acceleration?(d)
Which part ofgraphshows varying retardation?
(e)Find thedistance travelledin first 8 hours.Or
(a)Why does a ship not sink while a metal block sinks?(b)Why
does a manexperiences more pressure whilestanding than
whilelyingdown
on the floor?
(c) What the force with which a body of mass 1 kgis attracted
towardsearth?25)(a) Why is plasma membranecalled a selectively
permeable membrane?
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(b) How doescarbondioxide movein and out of thecell?
(c) What are thedifferences between RER and SER?
OR
(a) Differentiate between plant tissue and animal
tissue.(b)Write thedifference between bone andcartilage.
26)Which of the followingis thecorrect set up to determine the
melting point ofice?27)A magnet is repeatedly movedclosely over a
mixture ofiron powder andsulphur
powder.Which of the followingisnot observed?
(a) Iron powder is attracted towards magnet(b) sulphur powder
isleft behind(c)black powder isleft behind(d) iron powder
andsulphur powder areseparated
28) Thecolour of magnesium ribbonis
(a) grayish white(b) brown(c) black(d) grayish black
29) Whileheating ammonium chloride andsodium chloride mixture,
keep your face away
from vapours because:
(a) chlorine vapours may causeirritationineyes(b) ammonia
vapours may causeirritationin
eyes
(c) sodium chloride vapours may causeirritationineyes(d)
ammonium chloride vapours may
block nose
(30) In which of the following you observed that the
particlessettledown onstanding?
(a) commonsalt solution(b) muddy water(c) starchsolution(d) egg
albuminin water
(31) To prepare a colloidalsolution ofstarch, weshould:
(a) addstarch powder to boiling water andcool(b) addstarch
powder to cold water and boil
heat starch, addit to cold water and then bringit to boil (d)
add thin paste ofstarch to hot
water withstirring
(32) A mixture ofiron fillings andsulphur isheated, thecolour of
the mixture willchange:(a) black to yellow(b) yellow to black(c)
black to brown(d) brown to yellow
(33) Thecolour that indicates that dalis adultered with metanil
yellow is:
