321: Which of the following has the highest calories per gram?
(a) Proteins
(b) Fats
(c) Sugar
(d) Glucose
322: Assertion (A):
A Chemical reaction becomes faster at higher temperatures.
Reason (R):
At higher temperatures, molecular motion becomes more rapid.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is NOT a correct explanation of A
(c) A is true but R is false
(d) A is fasle but R is true
Explanation:
For every 10 degree C rise in temperature the rate of reaction doubles. The kinetic energy increases with increase in temperature thereby molecular motion becomes more rapid results in increased chances of combining of molecules.
323: For pasteurization by the Flash Method, milk is heated to a temperature of:
(a) 0°C
(b) 100°C
(c) - 4°C
(d) 72°C
324: Which one of the following is NOT radioactive ?
(a) Astatine
(b) Francium
(c) Tritium
(d) Zirconium
325: Rabies is caused by a
(a) Virus and it affects the nervous system
(b) Virus and it affects the cardiovascular system
(c) Bacteria and it affects the nervous system
(d) Bacteria and it affects the cardiovascular system