GK-Chemistry Question and Answer
GK-Chemistry Question and Answer
11. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and
provides an effective shield against radiation damage to living things is
provides an effective shield against radiation damage to living things is
- helium
- ozone
- oxygen
- methane
12. The most commonly used bleaching agent is
- alcohol
- carbon dioxide
- chlorine
- sodium chlorine
13. The nucleus of a hydrogen atom consists of
- 1 proton only
- 1 proton + 2 neutron
- 1 neutron only
- 1 electron only
14. The heat required to raise the temperature of body by 1 K is called
- specific heat
- thermal capacity
- water equivalent
- None of the above
15. The nuclear particles which are assumed to hold the nucleons together are
- electrons
- positrons
- neutrons
- mesons
16. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of
oxygen is
oxygen is
- 2.05 gram
- 3.05 gram
- 4.05 gram
- 5.05 gram
17. The octane number of zero is assigned to
- 2-methyl octane
- n-heptane
- iso-octane
- 3-methyl octane
20. The Latin word formica means ant. The name formic acid is derived from this Latin word
because
because
- this acid, in ancient times, was used to eliminate ant-hills
- this corrosive acid is secreted by ants to drive away their enemies
- this acid was first obtained by the distillation of ants
- ants are attracted by the odour of this acid