Radiocarbon is produced in the atmosphere as a result of
collision between fast neutrons and nitrogen nuclei present in the atmosphere
action of ultraviolet light from the sun on atmospheric oxygen
action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
lightning discharge in atmosphere
It is easier to roll a stone up a sloping road than to lift it vertical upwards because
work done in rolling is more than in lifting
work done in lifting the stone is much more than rolling it
work done in both is same but the rate of doing work is less in rolling
work done in rolling a stone is less than in lifting it
The absorption of ink by blotting paper involves
viscosity of ink
capillary action phenomenon
diffusion of ink through the blotting
siphon action
Siphon will fail to work if
the densities of the liquid in the two vessels are equal
the level of the liquid in the two vessels are at the same height
both its limbs are of unequal length
the temperature of the liquids in the two vessels are the same
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
the heating effect of current alone
hysteresis loss alone
both the heating effect of current and hysteresis loss
intense sunlight at noon
Nuclear sizes are expressed in a unit named
Fermi
angstrom
newton
tesla
Light year is a unit of
time
distance
light
intensity of light
Mirage is due to
unequal heating of different parts of the atmosphere
magnetic disturbances in the atmosphere
depletion of ozone layer in the atmosphere
equal heating of different parts of the atmosphere
Light from the Sun reaches us in nearly
2 minutes
4 minutes
8 minutes
16 minutes
Stars appears to move from east to west because
all stars move from east to west
the earth rotates from west to east
the earth rotates from east to west
the background of the stars moves from west to east