Previous year MCQs

General science UPPSC 2009 GS-I
Question

The inexhaustible source of energy of the star due to:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Conversion of Hydrogen to Helium

Detailed Solution:

The correct answer is “ Conversion of Hydrogen to Helium”.

The inexhaustible source of energy in stars is due to the conversion of hydrogen to helium. Stars act like nuclear reactors, where hydrogen atoms combine to form helium atoms through a process called fusion.

Similar Questions:

Which of the following is not related to the astronomical theories of climate change?
  1. A) Eccentricity of earth's orbit
  2. B) Obliquity of earth's rotational axis
  3. C) Precession of equinoxes
  4. D) Solar irradiance
Match List I with List II and select the correct answer from the code given below:
List-I - List-II

A. Dry Ice - 1. Treatment of Cancer
B. Gene therapy - 2. Freezing living bodies to be revived later
C. Cryonics - 3. Solid carbon dioxide
D. Cobalt-60 - 4. Treatment of blood diseases

A B C D
  1. A) 1 2 3 4
  2. B) 4 3 2 1
  3. C) 3 4 2 1
  4. D) 2 1 4 3
Which of the following statements about enzymes is/are correct?

1. They are biocatalysts.
2. They perform their action on the site where they are produced.

Select the correct answer from the codes given below:
Codes:
  1. A) 1 only
  2. B) 2 only
  3. C) Both 1 and 2
  4. D) Neither 1 nor 2
Which gas leaked out, in the Bhopal Gas Tragedy Causing numerous deaths?
  1. A) Chlorine
  2. B) M.I.C
  3. C) Ammonia
  4. D) Phosgene
While lifting a bucket of water from a well, we feel that the bucket:
  1. A) becomes heavier above the surface of water
  2. B) becomes lighter above the surface of water
  3. C) looses stability on coming out of water
  4. D) has gained mass on coming out of water
It is difficult to walk on ice than on road because:
  1. A) Ice is harder than road
  2. B) Road is harder than ice
  3. C) Ice does not offer any reaction when we push it with our foot
  4. D) Ice has a lesser friction than road
The "blue moon" phenomenon occurs:
  1. A) When two full moons occur in the same month
  2. B) When four full moons appear in two consecutive months of the same calendar year.
  3. C) when two full moons appear in the same month thrice in a calendar year
  4. D) None of the above.
Spring Tide occurs:
  1. A) When the sun and moon are in a straight line
  2. B) When the sun and moon make a right angle
  3. C) When a strong wind blows
  4. D) When the night is very cold
Harmful ultra-violet radiation coming from the sun can cause:
  1. A) Liver cancer
  2. B) Brain cancer
  3. C) Oral cancer
  4. D) Dermal cancer
A third allotrope of Carbon, Fullerene was discovered by a team of 3 scientists who were awarded Chemistry Nobel Prize. Identify the one who was not a member of that team.
  1. A) H.W. Kroto
  2. B) R.F. Curl
  3. C) R.E. Smalley
  4. D) Feyman
Which one of the following is used in food preservation?
  1. A) Sodium Carbonate
  2. B) Acetylene
  3. C) Benzoic Acid
  4. D) Sodium Chloride
Which one of the following pairs is not correctly matched?
Hormone - Function
  1. A) Insulin - Regulation of blood glucose
  2. B) Melatonin - Regulation of sleep
  3. C) Oxytocin - Release of milk from mammary glands
  4. D) Gastrin - Regulation of blood pressure