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
Ozone layer prevents ______________ radiation from entering the atmosphere? A. Infra-redB. Ultraviolet C. X-rays D. Gamma rays E. None of these
Which one of the following is a non-metallic mineral? A. Manganese B. MagnesiumC. Gypsum D. Bauxite E. None of these
Sedimentary rocks are__________? A. Porous B. Hard C. Rough D. Brittle E. Volcanic
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
who added 2nd Azan for friday prayers ? A. Hazrat Abu Bakr (R.A) B. Hazrat Umar (R.A)C. Hazrat Usman (R.A) D. Hazrat Ali (R.A)
Which of the following atmospheric layers help in radio communication? A. Exosphere B. Ionosphere C. Troposphere D. Stratosphere E. Ozone layer
Monsoon is caused by____________________? A. Seasonal reversal of winds B. Revolution of earth C. Movement of clouds D. Rise in temperature E. Rain forests
Fuel used in a Fast Breeder Reactor is _____________? A. Uranium Oxide B. Uranium Plutonium carbide C. Uranium Plutonium Oxide D. Uranium thorium Oxide E. None of these
Kilowatt-hour is a unit of____________? A. Power B. Electric Current C. Energy D. Time E. None of these