Previous year MCQs

General science UPPSC 1996 GS-I
Question

The diamond appears lustrous because of:

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Total Internal Reflection

Detailed Solution:

The correct answer is “Total Internal Reflection”.

The unique arrangement of carbon atoms in a diamond causes light to undergo total internal reflection multiple times before exiting the diamond, creating a brilliant and sparkling effect.

Similar Questions:

The inexhaustible source of energy of the star due to:
  1. A) Conversion of Hydrogen to Helium
  2. B) Conversion of Helium to Hydrogen
  3. C) Decay of radioactive elements
  4. D) Excess of oxygen that helps burning and release of energy
Match list-I with list-II and select the correct answer using the code given below the lists:
List-I (molecules) - List-II (elements present)

A. Vitamin B12 - 1. Magnesium
B. Haemoglobin - 2. Cobalt
C. Chlorophyll - 3. Copper
D. Brass - 4. Iron

Code:
A B C D
  1. A) 2 4 1 3
  2. B) 2 1 3 4
  3. C) 4 1 2 3
  4. D) 3 4 2 1
At which of the following battles was artillery used for the first time by one of the two armies?
  1. A) First Battle of Panipat
  2. B) Battle of Khanwah
  3. C) Battle of Plassey
  4. D) Third Battle of Panipat
Which one of the following is NOT an example of bio-mass energy source?
  1. A) Coal
  2. B) Nuclear energy
  3. C) Gobar (Dung)
  4. D) Wood
Given below are two statements one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Phytoplankton grow in abundance in the limnetic zone.
Reason (R): Limnetic zone is open water zone.

Select the correct answer from the code given below:
Code:
  1. A) (A) is false but (R) is true
  2. B) (A) is true but (R) is false
  3. C) Both (A) and (R) are true but (R) is not the correct explanation of (A)
  4. D) Both (A) and (R) are true and (R) is the correct explanation of (A)
Einstein was honoured with Nobel Prize for
  1. A) Photoelectric effect
  2. B) Theory of Specific Heats
  3. C) Special Theory of Relativity
  4. D) Bose-Einstein Statistics
The reason for stinging smell near the urinals is:
  1. A) Sulphur dioxide
  2. B) Chlorine
  3. C) Ammonia
  4. D) Urea
Wilhelm Rontgen invented
  1. A) Radio
  2. B) X-Ray Machine
  3. C) Electric Bulb
  4. D) Electric Motor
Which one of the following statements is not correct regarding the amino acid, tyrosine, present in protein rich foods?
  1. A) It can help increase energy level.
  2. B) It can cope with emotional and environmental stress.
  3. C) It can combat depression.
  4. D) It can protect against free-radicals responsible for ageing.
"Neno plug" refers to:
  1. A) a small bullet
  2. B) a small hearing aid
  3. C) a small rocket launcher
  4. D) None of the above
Bauxite is an ore of:
  1. A) Lead
  2. B) Aluminium
  3. C) Zinc
  4. D) Copper
The essential element in all organic compounds is:
  1. A) Nitrogen
  2. B) Oxygen
  3. C) Carbon
  4. D) Sulphur