Previous year MCQs

General science UPPSC 1995 GS-I
Question

Mirage is an example of:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Total internal reflection

Detailed Solution:

The correct answer is “Total internal reflection”.

Mirages are examples of total internal reflection.

Total internal reflection (TIR) is the phenomenon in which waves arriving at the interface (boundary) from one medium to another (e.g., from water to air) are not refracted into the second ("external") medium, but completely reflected back into the first ("internal") medium.

Similar Questions:

The mirror used by a dentist to examine the teeth of patients is
  1. A) Concave
  2. B) Convex
  3. C) Plane
  4. D) Cylinderical
Carnatic war was fought between:
  1. A) English and French
  2. B) English and Dutch
  3. C) English and Marathas
  4. D) Haider Ali and Marathas
Pressure inside a soap bubble is:
  1. A) More than atmospheric pressure
  2. B) Less than atmospheric pressure
  3. C) Equal to atmospheric pressure
  4. D) Half of atmospheric pressure
How many calories are gained by drinking a glass of water?
  1. A) Zero
  2. B) 15
  3. C) 25
  4. D) 50
Given below are two statements, one labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Most of the vitamins are not synthesised in human body.
Reason (R): Human organ synthesise only essential micronutrients.

Select the correct answer form the code given below.
  1. A) Both (A) & (R) are true & (R) is correct explanation of (A)
  2. B) Both (A) & (R) are true, but (R) is not correct explanation of (A)
  3. C) (A) is true, but (R) is false.
  4. D) A) is false, but (R) is true.
Quinine, the effective medicine in the treatment of malaria, is extracted from
  1. A) Bark of Cinnamon
  2. B) Leaves of Ocimum
  3. C) Bark of Cinchona
  4. D) Bark of Acacia Catechu
Radar is used mainly for:
  1. A) detecting objects by using light waves
  2. B) reflecting sound waves to detect objects
  3. C) determining the presence and location of objects with radio waves
  4. D) tracking rain bearing clouds
Red light is used for danger signals because it:
  1. A) is scattered least
  2. B) is soothing to eye
  3. C) has least chemical effect
  4. D) is absorbed least by air
Solder used in soldering metal pieces consists of an alloy of:
  1. A) Tin and Zinc
  2. B) Tin and Lead
  3. C) Zinc and Lead
  4. D) Zinc and Copper
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) :

Assertion (A): Invert sugar is more sweeter than sucrose.
Reason (R) : Invert sugar is obtained by the hydrolysis of sucrose.

Select the correct answer from 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
Which one of the following concerns soil?
  1. A) Edaphic
  2. B) Climatic
  3. C) Biotic
  4. D) Topography
Which yeast is used for commercial production of ethanol?
  1. A) Candida Albicans
  2. B) Saccharomyces cerevisiae
  3. C) Candida sloofi
  4. D) Leucosporidium frigidum