Notes: Drugs that bind to the receptor site and inhibit its natural function are called as antagonists. These drugs are useful when blocking of message is required.
52. Which of the following drug is an antihistamine?
[A] Dimetapp [B] Seldane [C] Cetrizine [D] All of the above
Notes: All of the above belongs to a class of drugs known as antihistamines. They interfere with the natural action of histamine by competing with histamine for binding sites of receptor where histamine exerts its effect.
53. Which of the following gas is responsible for burning of eyes when we cut an onion?
Notes: When we cut an onion, it releases a gas called as Propanethiol S-oxide. When mixed with certain enzymes in the onion, it creates a sulfur gas. When these gases reach the eyes, they create a mild acid which irritates the eyes.
54. Tartaric acid is used along with baking soda in baking breads and cakes. What is the use of Tartaric Acid in this process?
[A] It makes the bread / cake soft and fluffy [B] It stops making of lumps in bread / cake [C] It neutralizes the bitterness in bread / cake [D] It gives sweet aroma in the bread / cake
Notes: The process is known as chlor-alkali process. It is names so because the products formed chlor- for chlorine and alkali for sodium hydroxide. In this process, chlorine is given off at anode, hydrogen gas at the cathode and sodium hydroxide solution is formed near the cathode. The three products formed in this process are all useful.
57. Tap water conducts electricity, whereas distilled water does not. This is because in comparison to distilled water, tap water has __?
Notes: Tap water contains ions (due to dissolved impurities) which help in conduction of electricity. Whereas, distilled water does not contain ions, so it can not conduct electricity.
58. Which of the following is correct increasing order of pH values of the following substances?
[A] Gastric Juice < Milk Of Magnesia < Citric Juice < Pure Water [B] Gastric Juice < Citric Juice < Pure Water < Milk Of Magnesia [C] Citric Juice < Gastric Juice < Pure Water < Milk Of Magnesia [D] Gastric Juice < Citric Juice < Milk Of Magnesia < Pure Water
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