Q. Which allotropy of carbon is in rigid three-dimensional structures?
1) Graphite
2) Fullerence
3) Diamond
4) Carbon blck
Q. What is the role of positive catalyst in a chemical reaction?
1) It increase the rate of reaction
2) It decrease the rate of reaction
3) It increase the yield of the products
4) It provides better purity of the products
Q. Why hard water does not give lather with soap?
1) Hard water contains Ca and Mg ions which form precipitate with soap
2) Hard water contains sulphate and chloride ions which form precipiate
3) pH of hard water is high
4) pH of hard water is less
Q. Which one among the following metals is used in fireworks to make a brilliant white light?
1) Sodium
2) Magnesium
3) Aluminium
4) Silver
Q. Which of the following gases in the atmosphere is/are responsible for acid rains?
1. Oxides of sulphur
2. Oxides of nitrogen
3. Oxide of carbon
1) 1 and 2 only
2) 1 and 3 only
3) 2 only
4) 1,2 and 3 only
Q. Which one among the following gases readily combines with the haemoglobin of the blood?
1) Methene
2) Nitrogen dioxide
3) Carbon monoxide
4) Sulphur dioxide
Q. In human, which one among the following, with reference to breathing, is correct?
1) During inhalation, diaphragm relaxes
2) During exhalation thorax cavity expands
3) During inhalation, intrapleural pressure becomes more negative
4) Unlike inhalation, normal exhalation is an active process
Q. Dual-energy X-ray absorptiometry (DEXA) is used to measure -
1) Spread of solid tumour
2) Bone density
3) Ulcerous growth in stomach
4) extent of brain haemorrhage
Q. Human blood is a viscous fluid.This viscosity is due to-
1) Proteins in blood
2) Platelets in plasma
3) Sodium in serum
4) RBC and WBC in blood
Q. Cancer is more common in older people because-
1) Their immune systems have degenerated
2) The supply of certain hormones declines with age
3) Their bodies are unable to adjust to the changing environment
4) They have accumulated more mutations
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