Multiple choice physics

1. Radiocarbon is produced in the atmosphere as a result of?A.collision between fast neutrons and nitrogen nuclei present in the atmosphereB.action of ultraviolet light from the sun on atmospheric oxygenC.action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphereD.lightning discharge in atmosphere2. It is easier to roll a stone up a sloping road than to lift it vertical upwards because?A.work done in rolling is more than in liftingB.work done in lifting the stone is equal to rolling itC.work done in both is same but the rate of doing work is less in rollingD.work done in rolling a stone is less than in lifting it3. The absorption of ink by blotting paper involvesA.viscosity of inkB.capillary action phenomenonC.diffusion of ink through the blottingD.siphon action4. Siphon will fail to work ifA.the densities of the liquid in the two vessels are equalB.the level of the liquid in the two vessels are at the same heightC.both its limbs are of unequal lengthD.the temperature of the liquids in the two vessels are the same5. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due toA.the heating effect of current aloneB.hysteresis loss aloneC.both the heating effect of current and hysteresis lossD.intense sunlight at noon6. Nuclear sizes are expressed in a unit namedA.FermiB.angstromC.newtonD.tesla