Previous year MCQs

General science UPPSC 2023 GS-I
Question

Which of the following elements is not a Noble gas?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Actinium

Detailed Solution:

The correct answer is “Actinium”.
Actinium is not a noble gas; it is a radioactive element and is part of the actinide series. Noble gases, such as argon, radon, and krypton, are colorless, odorless gases that are chemically inert under standard conditions.

Similar Questions:

Chandraprabha Wildlife Sanctuary is situated in which district of Uttar Pradesh?
  1. A) Sonbhadra
  2. B) Chandauli
  3. C) Baharaich
  4. D) Lakhimpur Khiri
Biological resurfacing is a recent surgical technique used to treat problems of:
  1. A) Knee joints
  2. B) Ankle joints
  3. C) Hip joints
  4. D) Vertebral joints
Ozone protects biosphere from:
  1. A) Infra-red rays
  2. B) Ultraviolet rays
  3. C) X-rays
  4. D) Gama rays
The bacteria responsible for fixing nitrogen in Soyabean is:
  1. A) Rhizobium Leguminoserum
  2. B) Rhizobium japonicum
  3. C) Rhizobium phaseoli
  4. D) Rhizobium trifolii
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.
"Euro norms" are meant for:
  1. A) regulating vehicular speed
  2. B) classifying size of the vehicle
  3. C) regulating vehicular emission of harmful gases
  4. D) specifying power of the engine
In a diesel engine the fuel used is:
  1. A) vapour of diesel and air
  2. B) diesel only
  3. C) mixture of diesel and petrol
  4. D) mixture of diesel, air and petrol
Thiamin is:
  1. A) Vitamin C
  2. B) Vitamin B2
  3. C) Vitamin B6
  4. D) Vitamin B1
Which one of the following (Place of the revolt of 1857 - Start of rebellion) is not correctly matched?
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  2. B) Meerut — 10 May, 1857
  3. C) Lucknow —4 June 1857
  4. D) Jhansi — 11 May, 1857
Assertion (A): The atmosphere receives most of the heat only indirectly from the sun and directly from the earth's surface.
Reason (R): The conversion from shortwave solar to long-wave terrestrial energy takes place at the earth's surface.

Code:
  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
Which of the following is not a biodegradable polluter?
  1. A) Domestic waste
  2. B) Faecal matter
  3. C) Urine
  4. D) Pesticide
A hydrophyte is:
  1. A) a marine animal
  2. B) an aquatic plant
  3. C) a plant disease
  4. D) a rootless plant