Previous year MCQs

General science UPPSC 2010 GS-I
Question

"Endoscope" used by Doctors for examining the inside of the patient’s stomach, works on the principle of:

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Total internal reflection of light

Detailed Solution:

The correct answer is “Total internal reflection of light”.
The endoscope employs the total internal reflection concept using optical fibers. This procedure is used to study the interior of a hollow organ or cavities throughout the body.

Similar Questions:

After cutting cucumber if salt is added, then water comes out due to:
  1. A) Active transport
  2. B) Passive transport
  3. C) Osmosis
  4. D) Diffusion
Which of the following elements is not a Noble gas?
  1. A) Argon
  2. B) Radon
  3. C) Krypton
  4. D) Actinium
Apart from quinine, which one of the following herbal drug is used to cure malaria?
  1. A) Arteether
  2. B) Glace
  3. C) Lutivit
  4. D) Cineraria
Assertion (A): Woollen clothes keep us warm.
Reason (R): Wool fibres are made of a particular protein which is a bad conductor of heat.

Select the correct answer using the codes given below:
  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
Match lists-I and List-II and select the correct answer from the code given below:
List-I (Physical Quantities) - List-II (Units)

A. Acceleration - 1. Joule
B. Force - 2. Newton-second
C. Work done - 3. Newton
D. Impulse - 4. Metre/Second2

Code:
A B C D
  1. A) 1 2 3 4
  2. B) 2 3 4 1
  3. C) 3 4 1 2
  4. D) 4 3 1 2
Match List - I with List - II and select the correct answer from the codes given below:

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

Codes:
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
Which one of the following pairs is not correctly matched?
  1. A) Fullerenes–organic compounds containing fluorine
  2. B) Dry Ice–Solid carbon dioxide
  3. C) Keratin–protein found in the outer layer of human skin
  4. D) Mustard gas–poisonous liquid used in chemical warfare
Match list I with list II and select the correct answer from the code given below:
List-I (Acid) - List-II (Source)

A. Lactic acid - 1. Lemon
B. Acetic acid - 2. Rancid butter
C. Citric acid - 3. Milk
D. Butyric acid - 4. Vinegar

Code:
A B C D
  1. A) 1 4 3 4
  2. B) 3 4 1 2
  3. C) 2 3 4 2
  4. D) 3 2 3 1
Put the following events in chronological order and choose your answer with the help of given code:

1) Formation of an interim Government
2) The arrival of the Cabinet Mission
3) Muslim League launches Direct Action
4) Jinnah's wrecking of the Shimla Conference

Codes:
  1. A) B D C A
  2. B) D B C A
  3. C) A B D C
  4. D) D B A C
Which one of the following Thermometers is known as pyrometer?
  1. A) Thermo-electric thermometers
  2. B) Radiation thermometers
  3. C) Gas thermometers
  4. D) Liquid thermometers
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
Blank capsules used in dispensing are made of:
  1. A) egg-white
  2. B) gum
  3. C) starch
  4. D) gelatine