This document contains 10 multiple choice questions about various science topics, including: - Woolen clothes protecting the body from cold by being a poor conductor of heat. - Owls seeing clearly in the dark due to their forward-facing eyes with binocular vision. - Stainless steel containing chromium, nickel, and iron. - The maximum limit of sound a person can be exposed to before risking deafness being 120 decibels. - Carbon monoxide being a gas that often causes more air pollution than nitrogen, carbon dioxide, or oxygen.

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 in darkQ.8 The small bats can fly in dark
because-because-
((a) They have weak legsa) They have weak legs
land are likely to beland are likely to be
attacked by predatorsattacked by predators
(b) They generate flashes(b) They generate flashes
of lightof light
(c) They generate(c) They generate
ultrasonic sound wavesultrasonic sound waves
(d)They can see the(d)They can see the
objects in darknessobjects in darkness
Ans. (c)Ans. (c)

11. (a)(a)DecreasesDecreases
(b) Increases(b) Increases
(c) Remains the same(c) Remains the same
(d) Is zero(d) Is zero
Q.9 The time period of aQ.9 The time period of a
pendulum on moon-pendulum on moon-
Ans. (b)Ans. (b)

12. (a)(a) Water expands on freezingWater expands on freezing
(b) Bottle contracts at freezing point(b) Bottle contracts at freezing point
(c) Temperature outside the bottle is ten than(c) Temperature outside the bottle is ten than
that insidethat inside
(d) None of above(d) None of above
Q. 10 When water is filled in aQ. 10 When water is filled in a
bottle and is allowed to freeze, thebottle and is allowed to freeze, the
bottle because –bottle because –
Ans. (a)Ans. (a)