GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 063

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 063

621). The only element which is not containing neutrons in its nucleus is
A). berylium
B). helium
C). an isotope of hydrogen
D). an isotope of sodium

Answer: an isotope of hydrogen


   
622). Laser produces
A). high intense concentrated light
B). less intense concentrated light
C). non-parallel rays of light
D). none of these

Answer: high intense concentrated light

   
623). The Van Allen radiation. belt consists of high energy
A). protons and electrons
B). protons and neutrons
C). neutrons
D). protons

Answer: protons


   
624). An endothermic reaction is one in which
A). heat is liberated
B). heat is absorbed
C). temperature remains constant
D). heat is liberated when carried out at constant pressure

Answer: heat is absorbed


   
625). One of the gases polluting air is
A). nitrogen
B). oxygen
C). hydrogen
D). Sulphur dioxide

Answer: Sulphur dioxide



626). Water drops are spherical because of
A). surface tension
B). viscosity
C). density is one
D). polarity

Answer: surface tension

   
627). Marsh gas is
A). methane
B). ethane
C). SO2
D). CO2

Answer: methane


   
628). Human bone does not contain
A). oxygen
B). phosphorous
C). carbon
D). calcium

Answer: oxygen

   
629). The state of hybridisation of carbon in diamond is
A). sp^2
B). sp
C). sp^3
D). dsp^2

Answer: sp^3



   
630). The rays that do not contain the material particles are
A). alpha
B). beta
C). gamma
D). positive

Answer: gamma