Previous year MCQs

General science UPPSC 1993 GS-I
Question

Source of Vitamin D is:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Sun rays

Detailed Solution:

The correct answer is “Sun rays”.
The primary source of Vitamin D is sun rays.

Similar Questions:

Which one of the following is not a natural polymer:
  1. A) wool
  2. B) silk
  3. C) leather
  4. D) nylon
Consider the following statements:

Assertion (A): If Ice collects on the freeze the cooling in the refrigerator is affected adversely.
Reason (R) : Ice is a poor conductor.

Select the correct answer using 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.
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
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
The brain is responsible for
  1. A) thinking
  2. B) regulating the heartbeat
  3. C) balancing the body
  4. D) All of the above three
Which of the following statements are correct? Select the correct answer from the codes given below:

1. Femur is the longest bone, in the human body.
2. Cholera is a disease caused by bacteria.
3. "Athletic's" foot is a disease caused by virus.

Codes:
  1. A) 1, 2 and 3
  2. B) 1 and 3
  3. C) 1 and 2
  4. D) 2 and 3
Which one of the following is a natural polymer?
  1. A) Bakelite
  2. B) Silk
  3. C) Kevlar
  4. D) Lexan
Milk is an example of:
  1. A) Foam
  2. B) Sol
  3. C) Aerosol
  4. D) Emulsion
The leaning tower of Pisa does not fall because:
  1. A) it is tapered at the top
  2. B) it covers a large base area
  3. C) its centre of gravity remains at the lowest position
  4. D) the vertical line through the centre of gravity of the tower falls within the base
What is the function of the thermostat in a refrigerator?
  1. A) To lower the temperature
  2. B) To increase the freezing point
  3. C) To maintain constant temperature
  4. D) To decrease the melting point
Which of the following is known as laughing gas?
  1. A) Ammonia
  2. B) Nitrous Oxide
  3. C) Carbon Monoxide
  4. D) Chlorofluro Carbon
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