3. Q. 1. Woolen Clothes protectQ. 1. Woolen Clothes protect
the body from cold because-the body from cold because-
(a)(a) Cloth is a poor conductor of heatCloth is a poor conductor of heat
(b)(b) Cloth is good conductor of heatCloth is good conductor of heat
(c)(c) External heat rays enter into theExternal heat rays enter into the
body through woolen clothesbody through woolen clothes
(d)(d) None of aboveNone of above
Ans. (a)Ans. (a)
4. Q.2. The owl can see mostQ.2. The owl can see most
clearly in total darknessclearly in total darkness
because-because-
(a)(a)It has squint eyesIt has squint eyes
(b) It has large eyes with orbs(b) It has large eyes with orbs
directed forward, giving it binoculardirected forward, giving it binocular
sightsight
(c) It has light bulbs in its eyes(c) It has light bulbs in its eyes
provided by natureprovided by nature
Ans. (b)Ans. (b)
5. Q.3 Stainless steel contains-Q.3 Stainless steel contains-
(a) Chromium,Nickel,Iron and(a) Chromium,Nickel,Iron and
CarbonCarbon
(b) Nickel,Iron and Carbon(b) Nickel,Iron and Carbon
(c) Iron and Carbon only(c) Iron and Carbon only
(d) Chromium,Iron and Carbon(d) Chromium,Iron and Carbon
Ans. (d)Ans. (d)
6. Q.4 The maximum limit ofQ.4 The maximum limit of
sound beyond which asound beyond which a
person can become deaf is-person can become deaf is-
Ans. (d)Ans. (d)
(a) 55 db(a) 55 db
(b) 75 db(b) 75 db
(c) 85 db(c) 85 db
(d) 120 db(d) 120 db
Too… NoisyToo… Noisy
7. Q.5 Which gas often createsQ.5 Which gas often creates
more air- pollution?more air- pollution?
Ans. (c)Ans. (c)
(a)(a) NitrogenNitrogen
(b)(b) Carbon dioxideCarbon dioxide
(c) Carbon monoxide(c) Carbon monoxide
(d) Oxygen(d) Oxygen
8. Q.6 During cardiac failure,Q.6 During cardiac failure,
which of the following iswhich of the following is
advised as a first aid?advised as a first aid?
Ans. (a)Ans. (a)
(a)(a)Mouth of Mouth resuscitationMouth of Mouth resuscitation
(b) Giving external cardiac Massage(b) Giving external cardiac Massage
(c) Giving cool water to drink(c) Giving cool water to drink
(d) Giving complete body Massage(d) Giving complete body Massage
9. Q.7 … waves cannot beQ.7 … waves cannot be
transmitted throughtransmitted through
vacuum-vacuum-
(a) Light(a) Light
(b) Heat(b) Heat
(c) Sound(c) Sound
(d) Electromagnetic(d) Electromagnetic
Ans. (c)Ans. (c)
10. Q.8 The small bats can fly inQ.8 The small bats can fly in
dark because-dark because-
(a)(a)They can see the objects inThey can see the objects in
darknessdarkness
(b) They have weak legs land are(b) They have weak legs land are
likely to be attacked bylikely to be attacked by
predatorspredators
(c) They generate flashes of light(c) They generate flashes of light
(d) They generate ultrasonic sound(d) They generate ultrasonic sound
waveswaves
Ans. (d)Ans. (d)
12. (a)(a)Water expands on freezingWater expands on freezing
(b) Bottle contraits at fruzing point(b) Bottle contraits at fruzing point
(c) Temperature outside the bottle is(c) Temperature outside the bottle is
ten than that iundeten than that iunde
(d) None of above(d) None of above
Q. 10 When water is filled inQ. 10 When water is filled in
a bottle and is allowed toa bottle and is allowed to
freeze, the bottle because –freeze, the bottle because –
Ans. (a)Ans. (a)
13. Q.11Icepackedis sawdustdoes notQ.11Icepackedis sawdustdoes not
meltquickly. Why?meltquickly. Why?
Ans.Ans. Saw dust is a badSaw dust is a bad
conductor of heat andconductor of heat and
protects the ice from theprotects the ice from the
external heat and hence fromexternal heat and hence from
melting away quickly.melting away quickly.
14. Q. 12Aboatmanpushes thebankQ. 12Aboatmanpushes thebank
withhis pole. Why?withhis pole. Why?
Ans.Ans. Action and reaction beingAction and reaction being
equal and opposite,the bank willequal and opposite,the bank will
push the boat away from it.push the boat away from it.
15. Q. 13 A burning candle getsQ. 13 A burning candle gets
extinguished when coveredextinguished when covered
with a tumbler. Why?with a tumbler. Why?
Ans.Ans. A burning candle getsA burning candle gets
extinguished when covered with aextinguished when covered with a
tumbler because the supply oftumbler because the supply of
oxygen is cut – off and the flameoxygen is cut – off and the flame
goes out.goes out.
17. Q,15Ametaltea- pothas anebonyQ,15Ametaltea- pothas anebony
handle. Why?handle. Why?
Ans.Ans. Ebony being bad conductorEbony being bad conductor
of heat, the handle does not getof heat, the handle does not get
hot.hot.
18. Q. 16 Why is it easier to roll aQ. 16 Why is it easier to roll a
barrel than to pull it alongbarrel than to pull it along
the road?the road?
Ans.Ans. In winter the water vapourIn winter the water vapour
contained in the breath condensescontained in the breath condenses
into small droplets of water, whichinto small droplets of water, which
become visible. In summer it isbecome visible. In summer it is
not so.not so.
19. Q. 17 Why is hot soup moreQ. 17 Why is hot soup more
tasty than the colder one ?tasty than the colder one ?
Ans.Ans. As temperature is increased,As temperature is increased,
surface tension decreases and thesurface tension decreases and the
liquid now occupies more area.liquid now occupies more area.
Thus the hot soup occupies moreThus the hot soup occupies more
area on the tongue and is,area on the tongue and is,
therefore, more tasty than thetherefore, more tasty than the
colder one.colder one.
20. Q. 18 Why do the stars twinkle?Q. 18 Why do the stars twinkle?
Ans.Ans. The stars seem to twinkleThe stars seem to twinkle
due to two causes. First the lightdue to two causes. First the light
from the stars passes throughfrom the stars passes through
several mediums; secondly .several mediums; secondly .
