Previous year MCQs

General science UPPSC 2015 GS-I
Question

Which of the following is a semi-conductor?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Germanium

Detailed Solution:

The correct answer is “Germanium”.
Germanium is a metalloid that has semiconductor properties and is used in electronic devices.

Similar Questions:

The device used for converting alternating current to direct current is called
  1. A) Inverter
  2. B) Rectifier
  3. C) Transformer
  4. D) Transmeter
Statement (A): The signal of danger is made of red colour.
Reason (R): The scattering of red is least

Select the right answer with the help of code given below.
Code:
  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 among the following is the most abundantly found element in the world?
  1. A) Hydrogen
  2. B) Oxygen
  3. C) Nitrogen
  4. D) Carbon
Blank capsules used in dispensing are made of:
  1. A) egg-white
  2. B) gum
  3. C) starch
  4. D) gelatine
Which of the following statements is not correct?
  1. A) Air conditioners and air coolers both regulate the temperature
  2. B) Air conditioners and air coolers both regulate the humidity
  3. C) Air condition control humidity but air cooler does not control humidity
  4. D) Both controls the speed of air
The Xylem in plants is responsible for transporting -
  1. A) Water
  2. B) Oxygen
  3. C) Amino Acid
  4. D) Food
Match List-I and List-II and select the correct answer from the code given below:
List–I List–II

A. Golden Triangle - 1. Myanmar
B. Bermuda Triangle - 2. Opium producing area of South East Asia
C. Rice bowl of Far East - 3. China
D. Red Basin - 4. North Atlantic Ocean

Codes:
  1. A) 3 2 4 1
  2. B) 2 4 1 3
  3. C) 4 3 2 1
  4. D) 1 4 3 2
Which one of the following gases, released from bio-gas plant is used as a fuel gas?
  1. A) Butane
  2. B) Propane
  3. C) Methane
  4. D) Ethane
Which of the following vitamins is essential for normal vision?
  1. A) Folic acid
  2. B) Riboflavin
  3. C) Niacin
  4. D) Retinol
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
Graphene is:
  1. A) An alloy of carbon
  2. B) Nano structure of carbon
  3. C) Isotope of carbon
  4. D) None of the above
In National Parks, Genetic diversity is maintained by
  1. A) In-situ conservation
  2. B) Ex-situ conservation
  3. C) Genepool
  4. D) None of the above