841: Democracy exists in India. Government is run by the elected representatives of the people. For proper functioning of this system:
(a) One should cast vote in elections
(b) One must be prompt in paying taxes
(c) One must be good to himself and to the society
(d) None of these
842: The Supersonic jets tend to cause:
(a) Destruction of ozone layer
(b) Sound pollution
(c) Nervous system breakdown
(d) All of the above
843: What is the purpose of evolved Laser Interferometer Space Antenna (eLISA) project?
(a) To detect neutrinos
(b) To detect gravitational waves
(c) To detect the effectiveness of missile defence system
(d) To study the effect of solar flares on our communication systems
844: A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, the number of revolutions made by the larger wheel will be:
(a) 12
(b) 49
(c) 9
(d) 4
845: A free-floating astronaut A pushes another free-floating astronaut B in space. The mass of A is greater than that of B. The force exerted by the astronaut A on the astronaut B will be:
(a) Equal to zero.
(b) Equal to the force exerted by B on A.
(c) Greater than the force exerted by B on A.
(d) Less than the force exerted by B on A