Q1. Which gas is responsible for the swelling of bread?
(a) Oxygen
(b) Carbon monoxide
(c) Carbon dioxide
(d) Ammonia
Q2. The metal compound commonly found in Sindhoor or Kumkum is based on
(a) Tin
(b) Lead
(c) Copper
(d) Zinc
Q3. Which among the following elements (metals) pollutes the air of a city having a large number of automobiles?
(a) Cadmium
(b) Lead
(c) Chromium
(d) Nickel
Q4. Which one among the following is used as a moderator in nuclear reactors?
(a) Ozone
(b) Heavy hydrogen
(c) Heavy water
(d) Hydrogen peroxide
Q5. What is a mixture of potassium nitrate, powdered charcoal and sulphur called?
(a) Glass
(b) Cement
(c) Paint
(d) Gun powder
Q6. Alum is used as
(a) an analgesic
(b) a fertilizer
(c) a disinfectant
(d) a purifier for water
Q7. In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?
(a) Copper
(b) Iron
(c) Aluminium
(d) Titanium
Q8. Human stomach produces acid ‘X’ which helps in digestion of food. Acid ‘X’ is
(a) acetic acid
(b) methanoic acid
(c) hydrochloric acid
(d) citric acid
Q9. An ideal gas is one which obeys
(a) Gas laws
(b) Boyle’s laws
(c) Charle’s law
(d) Avogadro’s law
10. The enzymes are killed
(a) at a very high temperature
(b) during chemical reaction
(c) at low temperature
(d) under atmospheric pressure
Q11. Which has maximum calorific value?
(a) Fat
(b) Protein
(c) Carbohydrate
(d) Amino acid
Q12. In which type of coal percentage of carbon is the highest?
(a) Peat
(b) Lignite
(c) Bituminous
(d) Anthracite
Q13. Blood cells do not shrink in blood because blood is
(a) hypertonic
(b) isotonic
(c) equimolar
(d) hypotonic
Q14. The gas which emits from rice field is
(a) ethane
(b) methane
(c) nitrogen
(d) All of the above
Q15. The nuclear fuel in the sun is
(a) helium
(b) hydrogen
(c) uranium
(d) alpha particles
