Monsoon is caused by____________________?
A. Seasonal reversal of winds
B. Revolution of earth
C. Movement of clouds
D. Rise in temperature
E. Rain forests
Which of the following atmospheric layers help in radio communication?
A. Exosphere
B. Ionosphere
C. Troposphere
D. Stratosphere
E. Ozone layer
A moderator is used in nuclear reactor in order to ?
A. Accelerate the neutrons
B. Slow down the speed of the neutrons
C. Increase the number of elections
D. Decrease the number of electrons
E. None of these
Sedimentary rocks are__________?
A. Porous
B. Hard
C. Rough
D. Brittle
E. Volcanic
Which one of the following is a non-metallic mineral?
A. Manganese
B. Magnesium
C. Gypsum
D. Bauxite
E. None of these
Ozone layer prevents ______________ radiation from entering the atmosphere?
A. Infra-red
B. Ultraviolet
C. X-rays
D. Gamma rays
E. None of these
The phenomenon of Aurora Borealis, the display of red and green lights in northern hemisphere is due to radiations from____________ ?
A. Ionosphere
B. Troposphere
C. Mesosphere
D. Stratosphere
E. None of these
Yeast is used in making bread because it produces____________?
A. Carbon dioxide
B. Sugar
C. Bacteria
D. Oxygen
E. None of these
Oasis is associated with___________?
A. Glaciers
B. Desert
C. Islands
D. Volcanoes
E. Fertile land
Quartz crystal in quartz watches work on the principle called?
A. Photoelectric effect
B. Stark effect
C. Thermionic effect
D. Piezo-electric effect
E. None of these