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241 .The mass number of an atom is determined by-
Adding the number of neutrons and number of electrons
Adding the number of protons and number of electrons
The number of protons only
Adding the number of neutrons and number of protons

242 .A deep sea driver may hurt his ear drum during diving because of
lack of oxygen
high atmospheric pressure
high water pressure
All of the above

243 .Velocity of sound in air
(i) increases with temperature
(ii) decreases with temperature
(iii) increase with pressure
(iv) is independent of pressure
(v) is independent of temperature

Only (i) and (ii) are true
Only (ii) and (iv) are true
Only (i) and (iii) are true
Only (i) and (iv) are true

244 .It is difficult to cook at high altitudes because
there is less oxygen in the air
due to falling temperature, more heat has to be given
due to decrease in atmospheric pressure, the boiling point of water decreases
of high moisture content there

245 .The depletion of Ozone layer is mainly due to-
Chloroflurocarbons
Volcanic Eruptions
Aviation fuels

246 .A symbiotic relationship in which both species benefit is best described as _______.
Commensalism
Competative exclusion
Parasitism
An obligatory relationship

247 .In optical instrument, the lenses are used to form image by the phenomenon of -
reflection
refraction
scattering
diffusion

248 .If there were no atmosphere, the length of the day on the earth will
decrease
increase
remain the same
none of these

249 .The resistance of an ideal ammeter is
zero
very low
very high
infinite