The half life of a radioactive element is 8 days. How long will it take to reduce it from 10mg to 5mg?
(a) 4 days
(b) 12 days
(c) 16 days
(d) 8 days
The term “Blue Shift” is used to indicate:
(a) Doppler effect in which an object appears bluer when it is moving toward the observer or observer is moving toward the object
(b) Turning a star from white to blue
(c) In future sun would become blue
(d) Black hole was blue at its start
Kilowatt-hour is a unit of:
(a) Power
(b) Electric current
(c) Energy
(d) Time
Fuel used in Fast Breeder Reactor is:
(a) Uranium oxide
(b) Uranium plutonium carbide
(c) Uranium Plutonium oxide
(d) Uranium thorium oxide
Monsoon is caused by:
(a) Seasonal reversal of winds
(b) Revolution of earth
(c) Movement of the clouds
(d) Rise in temperature
Which of the following atmospheric layers helps in radio communication?
(a) Exosphere
(b) Ionosphere
(c) Troposphere
(d) Stratosphere
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 electrons
(d) Decrease the number of electrons
Sedimentary rocks are:
(a) Porous
(b) Hard
(c) Rough
(d) Brittle
Which one of the following is a metal?
(a) Gypsum
(b) Limestone
(c) Iron
(d) Granite
What is used in making of alloys?
(a) Chromium
(b) Granite
(c) Gypsum
(d) Limestone