Previous year MCQs

General science UPPSC 2020 GS-I
Question

Without green house effect, the average temperature of earth surface would be:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: -18°C

Detailed Solution:

The correct answer is “-18°C”.
Without the greenhouse effect, the average temperature of the Earth's surface would be around -18°C. The greenhouse effect, caused by greenhouse gases in the atmosphere, helps to keep the Earth's surface temperature at a more habitable average of about 15°C.

Similar Questions:

Thiamin is:
  1. A) Vitamin C
  2. B) Vitamin B2
  3. C) Vitamin B6
  4. D) Vitamin B1
Match List-I with List-II and select the correct answer using the codes given below:
List I - List II

A) Balu - 1) Uttar Pradesh
B) Manda - 2) Jammu & Kashmmir
C) Padri - 3) Haryana
D) Hulas - 4) Gujarat
  1. A) A-3, B-2, C-1, D-4
  2. B) A-2, B-3, C-4, D-1
  3. C) A-2, B-4, C-3, D-1
  4. D) A-3, B-2, C-4, D-1
According to J.V. Narlikar which of the following has so far NOT been considered as a science?
  1. A) Astrology
  2. B) Astronomy
  3. C) Cosmology
  4. D) Nanotechnology
Which one of the following is not related with space terminology?
  1. A) Telemetering
  2. B) Weightlessness
  3. C) Cislunar
  4. D) Byte
SONAR is mostly used by:
  1. A) Astronauts
  2. B) Doctors
  3. C) Engineers
  4. D) Navigators
Which color combination is best suited for umbrella to protect from sunlight (stinter)?
  1. A) White on the upper and black in the inner side
  2. B) Black on the upper and white in the inner side
  3. C) Only black
  4. D) Only white
Which one of the following forms an irreversible complex with haemoglobin of the blood?
  1. A) Carbon dioxide
  2. B) Pure Nitrogen gas
  3. C) Carbon monoxide
  4. D) A mixture of carbon dioxide and helium
Television viewers using dish antenna to receive satellite signals do not receive signals during rain because:

(A) Of the small size of the antenna.
(B) Rain droplets absorb the energy of radio waves.
(C) Rain droplets disperse the energy of radio waves from their original direction.

Which of the above statements are correct?
  1. A) Only A
  2. B) Only A and B
  3. C) Only B and C
  4. D) A, B and C
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
Which of the following contains carbon?
  1. A) Lignite
  2. B) Tin
  3. C) Silver
  4. D) Iron
Electric motors operating at low voltages tend to burn out because
  1. A) they draw more current which is inversely proportional to the voltage
  2. B) they draw more current which is inversely proportional to the square root of the voltage
  3. C) they draw heat proportional to v2
  4. D) low voltage sets in electrical discharge
In cold weather, aquatic animals survive when water at the top layer of the lake freezes into ice because:
  1. A) they can breathe in ice
  2. B) they have enough of accumulated oxygen inside them
  3. C) their body structure is such that they can survive without oxygen
  4. D) water has highest density at 4°C so underneath the top layer of ice there is layer of water