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151. Inside an aeroplane, flying at a high altitude,
- A. the pressure is the same as that outside
- B. normal atmospheric pressure is maintained by the use of air pumps
- C. the pressure inside is less than the pressure outside
- D. normal humidity and partial vacuum are maintained
- Check Answer | Discussion
152. It is easier to roll a stone up a sloping road than to lift it vertical upwards because
- A. work done in rolling is more than in lifting
- B. work done in lifting the stone is equal to rolling it
- C. work done in both is same but the rate of doing work is less in rolling
- D. work done in rolling a stone is less than in lifting it
- Check Answer | Discussion
153. Suitable impurities are added to a semiconductor depending on its use. This is done in order to
- A. increase its life
- B. enable it to withstand higher voltages
- C. increase its electrical conductivity
- D. increase its electrical resistivity
- Check Answer | Discussion
154. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
- A. at sea level
- B. at the top of Mt. Everest
- C. at a place in a valley below sea level
- D. in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
- Check Answer | Discussion
155. Natural radioactivity was discovered by
156. Pa(Pascal) is the unit for
157. Isotopes of an element contain
- A. the same number of protons but different number of neutrons
- B. the same number of neutrons but different number of protons
- C. equal number of protons and electrons
- D. equal number of nucleons
- Check Answer | Discussion
158. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
159. The absorption of ink by blotting paper involves
- A. viscosity of ink
- B. capillary action phenomenon
- C. diffusion of ink through the blotting
- D. siphon action
- Check Answer | Discussion
160. Mica is used in electrical appliances such as electric iron because mica is
- A. a good conductor of heat but a bad conductor of electricity
- B. a bad conductor of heat but a good conductor of electricity
- C. a good conductor of heat as well as electricity
- D. a bad conductor of heat as well as electricity
- Check Answer | Discussion
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