Previous year MCQs

General science UPPSC 1996 GS-I
Question

Liquid crystals are used in:

Answer & Solution

Answer: (Detailed Solution Below)

Option D: All the above

Detailed Solution:

The correct answer is “All the above”.
Liquid crystals are used in a variety of electronic devices, including wristwatches, display devices (such as LCD screens), and pocket calculators. They are valued for their ability to change their optical properties in response to electric fields, making them ideal for these applications.

Similar Questions:

Which one of the following minerals is necessary to control heart beat?
  1. A) Sodium
  2. B) Sulphur
  3. C) Potassium
  4. D) Iron
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II
(Naturally occurring substance) - (Elements present)

A. Diamond - 1. Calcium
B. Marble - 2. Silicon
C. Sand - 3. Aluminum
D. Ruby 4. Carbon

Codes:
A B C D
  1. A) 3 1 2 4
  2. B) 4 2 1 3
  3. C) 2 1 3 4
  4. D) 4 1 2 3
Which one of the following is not correctly matched?
Vitamin - Role
  1. A) Vitamin B12 - Antianaemic factor
  2. B) Vitamin C - Antiscorbutic factor
  3. C) Vitamin D - Antisterility factor
  4. D) Vitamin K - Antihaemorrhagic factor
Which acid is used in photography:
  1. A) Formic acid
  2. B) Oxalic acid
  3. C) Citric acid
  4. D) Acetic acid
Tetraethyl lead (TEL) is added to petrol:
  1. A) To prevent its freezing
  2. B) To increase its flash point
  3. C) To increase anti-knocking rating
  4. D) To increase its boiling point
The velocity of wind is measured by
  1. A) Barometer
  2. B) Anemometer
  3. C) Hydrometer
  4. D) Wind Vane
Consider the following statements in respect of a jet engine and a rocket:

1) A jet engine uses the surrounding air for it oxygen supply and so is unsuitable for motion in space.
2) A rocket carries its own supply of oxygen in the gas form as fuel.

Which of the above statements is/are correct?
  1. A) (1) only
  2. B) (2) only
  3. C) Both (1) and (2)
  4. D) Neither (1) nor (2)
Telescope was invented by:
  1. A) Gallileo
  2. B) Gutinberg
  3. C) Edision
  4. D) Graham Bell
Image formed on Retina is:
  1. A) Equal to object but inverted
  2. B) Smaller than object but straight
  3. C) Smaller than object but inverted
  4. D) Equal to object but straight
Consider the following statements:

Assert ion (A): Earnest Rutherford asserted before the Royal Society that man will never get nuclear power.
Reason (R): He was sure that Einstein's law will fail and mass will not be converted into energy.

Select your answer from the coding scheme 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
  3. C) (A) is true and (R) is false
  4. D) (A) is false but (R) is true
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
Ganpati festival in Maharashtra was started by:
  1. A) B. G. Tilak
  2. B) M. G. Ranade
  3. C) Bipin Chandra Pal
  4. D) Aurbindo Ghosh