Q1. What is the element that is in the highest percentage in the composition of the earth?
Q2. Formation of ozone hole is maximum over
Q3. The presence of ozone in the stratosphere is responsible for
(a) increasing the average global temperature in recent years
(b) higher rate of photosynthesis
(c) checking the penetration of ultra-violet rays to the earth
(d) supplying oxygen for people travelling in jets
Q4. The advantage of detergents over soaps is
(a) Detergents are soluble in water
(b) Detergents could not give much lather
(c) Detergents give lather even with hard water
(d) Soaps give lather with only soft water
Q5. The fundamental particles present in the nucleus of an atom are
(a) Electron, proton
(b) Proton, neutron
(c) Neutron, electron
(d) Neutron, positron
Q6. Bleaching action of moist Sulphur di-oxide is because of its
(a) basic property
(b) acidic property
(c) oxidizing property
(d) reducing property
Q7. The long range potential of nuclear energy in India depends on its reserves of
Q8. Which of the following gases will effuse out of football bladder most quickly?
Q9. Which of the following alkali metals has highest specific heat?
Q10. In which of the following substances all carbon atoms are quaternary in nature?