The Sun is a massive, glowing sphere of hot plasma at the center of our solar system and is scientifically classified as a Star
72. We have days and nights because of
(A) Earth’s revolution
(B) Sun’s rotation
(C) Sun’s revolution
(D) None of these
Answer:
(D) None of these
Explanation:
Day and night are caused by the Earth’s rotation on its own axis, not its revolution around the Sun or anything related to the Sun’s movement.
73. For Protection of food ……………. is used.
(A) Preservative
(B) Glucose
(C) Catalyst
(D) None of these
Answer:
(A) Preservative
Explanation:
Preservatives (like salt, sugar, vinegar, or chemical additives) are substances added to food to protect it from spoiling by preventing the growth of bacteria, fungi, and other microorganisms.
74. Water which is free from germ and impurities is known as:
(A) Unsafe Water
(B) Safe Water
(C) Impure Water
(D) None of these
Answer:
(B) Safe Water
Explanation:
Water that has been filtered, treated, or boiled to remove harmful germs and impurities is fit for human consumption and is referred to as potable or “safe water.
75. We should take ……………. for instant energy.
(A) Vitamins
(B) Fats
(C) Minerals
(D) Glucose
Answer:
(D) Glucose
Explanation:
Glucose is a simple sugar that does not need to be broken down by the digestive system; it is absorbed directly into the bloodstream to provide the body with a rapid, instant supply of energy.
