Previous year MCQs

General science UPPSC 1996 GS-I
Question

Tetraethyl lead (TEL) is added to petrol:

Answer & Solution

Answer: (Detailed Solution Below)

Option C: To increase anti-knocking rating

Detailed Solution:

The correct answer is “To increase anti-knocking rating”.
It prevents the engine from knocking by delaying the combustion process. However, due to its harmful environmental effects, its use has been phased out in most countries.

Similar Questions:

Thermostat is related with?
  1. A) Humidity
  2. B) Temperature
  3. C) Air
  4. D) Clouds
Mirage is an example of:
  1. A) Refraction
  2. B) Total internal reflection
  3. C) Dispersion
  4. D) Diffraction
Cholestrol is
  1. A) an insecticide
  2. B) a vitamin
  3. C) a steroid
  4. D) an enzyme
Bhopal Gas Tragedy was caused due to the leakage of:
  1. A) Methyl Isocynate
  2. B) Nitrogen dioxide
  3. C) Sulphur dioxide
  4. D) Carbon monoxide
Without green house effect, the average temperature of earth surface would be:
  1. A) 0°C
  2. B) -18°C
  3. C) 5°C
  4. D) -20°C
Nitrogen fixing bacteria make combination with cell of the root of:
  1. A) Pulses
  2. B) Rice
  3. C) Wheat
  4. D) Sugarcane
Sound waves do not travel in:
  1. A) Solids
  2. B) Liquids
  3. C) Gases
  4. D) Vacuum
Which of the following vitamin is responsible for coagulation of blood in human being ?
  1. A) Vitamin K
  2. B) Vitamin E
  3. C) Vitamin A
  4. D) Vitamin C
Milk is an example of:
  1. A) Foam
  2. B) Sol
  3. C) Aerosol
  4. D) Emulsion
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) :

Assertion (A): Invert sugar is more sweeter than sucrose.
Reason (R) : Invert sugar is obtained by the hydrolysis of sucrose.

Select the correct answer from the codes given below.
Codes :
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. B) Both (A) and (R) are true but (R) is not the correct explanation of (A)
  3. C) (A) is true but (R) is false
  4. D) (A) is false but (R) is true
Main functions of White blood cells are?
  1. A) To carry oxygen
  2. B) To carry CO2
  3. C) To develop immunity
  4. D) None of these
Assertion 'A' and Reason 'R' are given below. Study them and choose the correct answer from the codes given below:

Assertion (A): Lightning conductors prevent buildings from damages.
Reason (R): It passes the charge to the earth.

Codes:
  1. A) Both A and R are true and R is the correct explanation of A
  2. B) Both A and R are true but R is not the correct explanation of A
  3. C) A is true but R is false
  4. D) A is false but R is true