191 Q) Nearly 30% of the solar radiations return back to the space without contributing anything to the earth' s surface temperature. This amount of radiation is known as
(a) black body
(b) tropopause
(cj earth's albedo
(d) mesopause
192 Q) "Assertion (A) Small liquid drops always
assume spherical shape.
Reason (R) Liquid tends to have the minimum surface area due to surface tension."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
193 Q) "Consider the following statements
I.Transverse waves occur when a disturbance creates oscillations perpendicular to the propagation.
II.Longitudinal waves occur when the oscillations are parallel to the direction of propagation.
Which of the following statements given above is/are correct?
"
(a)Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
194 Q) Which one among the following lasers is used in cancer treatment?.
(a) He-Ne laser
(b) Ruby laser
(c) C02 laser
(d) Semiconductor laser
195 Q) The impurity atom with which pure silicon should be doped to make a p-type semiconductor are those of
(a) Phosphorus
(b) Boron
(c) Antimony
(d)Arsenic
196 Q) "Consider the following communication systems
I. Tele-printing
II. Telegraphy
III. Radio broadcast
IV. Fax
Which of the communication system given above are “analogue communication systems""?"
(a)I, II, III and IV
(b) I, II and III
(c) II and III
(d) II and IV
197 Q) Why is it easier to swim in sea water?.
(a)Atmospheric pressure is highest at the sea
(b)Sea water contains salt
(c)Density of sea water is higher than the ordinary water
(d)None of the above
198 Q) After rising a short distance, the smooth column of smoke from a cigarette breaks up into irregular and random pattern. In a similar fashion, a stream of fluid flowing past an obstacle breaks up into eddies and vortices which give the flow irregular velocity components transverse to the flow direction. Other examples include the wakes left in water by moving ships, the sound produced by whistling and by wind instruments. These examples are the results of
(a)laminar flow of air
(b)streamline flow of air
(c)turbulent flow of air
(d)viscous flow at low speed
199 Q) "Which one of the following pairs of rays is electromagnetic in nature? .
"
(a)Alpha rays and X-rays
(b)Alpha rays and cosmic rays
(cj Infrared rays and beta rays
(d)Infrared rays and X-rays
200 Q) "Assertion (A) In winter, although many lakes and rivers are frozen, the marine fish still survive.
Reason (R) The density of water is maximum at 4° C. Hence, water below the frozen outer surface is maintained at 4° C."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
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