Previous year MCQs

General science UPPSC 2018 GS-I
Question

Graphene is:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Nano structure of carbon

Detailed Solution:

The correct answer is “Nano structure of carbon”.
Graphene is a nano structure of carbon.

It is a single layer of carbon atoms arranged in a hexagonal lattice. Graphene is known for its exceptional properties, including high electrical conductivity, thermal conductivity, and mechanical strength.

Similar Questions:

The smallest unit of length is
  1. A) micron
  2. B) nanometre
  3. C) angstrom
  4. D) fermi-metre
The Parliamentary form of Government was first introduce in which country?
  1. A) Great Britain
  2. B) Belgium
  3. C) France
  4. D) Switzerland
Natural growth of population is the outcome of which of the following?

A. Crude Birth Rate
B. Crude Death Rate
C. Migration
D. Marriages

Select the correct answer from the codes given below:
Codes:
  1. A) Only A
  2. B) Only C
  3. C) B and D
  4. D) A and B
"Endoscope" used by Doctors for examining the inside of the patient’s stomach, works on the principle of:
  1. A) Reflection of light
  2. B) Dispersion of light
  3. C) Total internal reflection of light
  4. D) Refraction of light
Laser beam is used for:
  1. A) treatment of cancer
  2. B) treatment of heart
  3. C) treatment of eye
  4. D) treatment of kidney
Which of the following States ranks first in India in length of roads?
  1. A) Maharashtra
  2. B) Uttar Pradesh
  3. C) Madhya Pradesh
  4. D) Rajasthan
To look total image of a person, the minimum height of a plane mirror is:
  1. A) Equal to the height of a person.
  2. B) Half of the height of a person.
  3. C) One fourth of the height of a person.
  4. D) Two times the height of a person.
A colour-blind man marries a normal woman. The features of colour blindness will appear in his:
  1. A) sons
  2. B) daughters
  3. C) sons's sons
  4. D) daughter's sons
Which of the following is used in fire alarm ?
  1. A) Photo cell
  2. B) Water
  3. C) Solar cell
  4. D) None of the above
Photovoltaic cells are:
  1. A) Solar cells
  2. B) Thermal cells
  3. C) Sulphur cells
  4. D) Molar cells
Easily soluble in water is:
  1. A) Carbon
  2. B) Nitrogen
  3. C) Ammonia
  4. D) Iodine
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