Previous year MCQs

General science UPPSC 1998 GS-I
Question

To avoid "knocking" of the engine of a car, which one of the following is used as an anti-knocking agent?

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Lead Tetra Ethyl

Detailed Solution:

The correct answer is “Lead Tetra Ethyl”.
While Lead Tetra Ethyl (TEL) was once widely used as an anti-knocking agent, its harmful effects on human health and the environment led to its phase-out in many countries. It was replaced by other additives like ethanol and oxygenates.

Similar Questions:

If the doors of a refrigerator are left open for a few hours, the room temperature:
  1. A) will decrease
  2. B) will increase
  3. C) will remain the same
  4. D) will decrease only in the area in the vicinity of the refrigerator
Ripening hormone is:
  1. A) Gibberellin
  2. B) Morphactin
  3. C) Ethylene
  4. D) I.B.A.
The pathogen responsible for common cold is:
  1. A) Orthomixo virus
  2. B) Rhino virus
  3. C) Leukaemia virus
  4. D) Polio virus
Consider the following statements and select the correct answer from the code given below:

1. Presence of calcium sulphate makes water hard and unfit for use.
2. Diamond is harder than copper and iron.
3. The main component of air is oxygen.
4. Nitrogen is used in the preparation of vegetable ghee.

Code:
  1. A) 1 and 2
  2. B) 3 and 4
  3. C) 1 and 3
  4. D) 2 and 4
Which of the following statements is not correct?
  1. A) Air conditioners and air coolers both regulate the temperature
  2. B) Air conditioners and air coolers both regulate the humidity
  3. C) Air condition control humidity but air cooler does not control humidity
  4. D) Both controls the speed of air
Television signals cannot be received beyond a certain distance because:
  1. A) Signals are weak
  2. B) Antenna is weak
  3. C) Air absorbs signals
  4. D) The surface of the earth is curved
The most densely populated state of India is:
  1. A) Bihar
  2. B) Kerala
  3. C) U.P.
  4. D) West Bengal
The "universal donor" is a person whose blood-group is:
  1. A) A
  2. B) B
  3. C) AB
  4. D) O
Which one of the following pairs is correctly matched?
  1. A) Pneumonia - Lungs
  2. B) Cataract - Thyroid gland
  3. C) Jaundice - Eye
  4. D) Diabetes - Liver
Oil and Natural Gas commission has centres in two other Countries. They are:
  1. A) U. K. and Canada
  2. B) Egypt and Iran
  3. C) Cambodia and Indonesia
  4. D) Vietnam and Egypt
The disease caused by deficiency of protein in children is
  1. A) Kwashiorkor
  2. B) Pellagra
  3. C) Beri beri
  4. D) Rickets
Easily soluble in water is:
  1. A) Carbon
  2. B) Nitrogen
  3. C) Ammonia
  4. D) Iodine