Previous year MCQs

General science UPPSC 2016 GS-I
Question

Photovoltaic cells are:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Solar cells

Detailed Solution:

The correct answer is “Solar cells”.
Photovoltaic cells, commonly known as solar cells, are devices that convert sunlight directly into electricity through the photovoltaic effect.

When photons from sunlight strike the semiconductor material within the solar cell, they create an electric current by knocking electrons loose from their atoms. This generated electrical energy can then be used to power various devices or stored in batteries for later use.

Similar Questions:

Thermometer is an instrument that:
  1. A) Measures the heat
  2. B) Measures the temperature
  3. C) Automatically controls the temperature of a body
  4. D) Self-regulate the body
Match List-I with List-II and select the correct answer from the codes given below the lists:
List-I Pollutants - List-II Effects

A. Carbon monoxide - 1. Damage to liver and kidney
B. Oxides of Nitrogen - 2. Cancer
C. Soil particles - 3. Ailments related to breathing
D. Lead - 4. Central nervous system

Code:
A B C D
  1. A) 2 3 4 1
  2. B) 4 3 2 1
  3. C) 1 2 3 4
  4. D) 3 4 1 2
Why does water boil at temperature below 100°C at higher altitudes?
  1. A) The atmospheric pressure decreases and hence boiling point is lowered
  2. B) The gravitational attraction is less
  3. C) Because of heavy winds in mountains
  4. D) None of the above is correct
The refugees and migrants in Europe reached which milestone mark recently as disclosed by the UNHCR?
  1. A) 1.0 Million
  2. B) 1.5 Million
  3. C) 2.0 Million
  4. D) 3.0 Million
The planet nearest to the earth is:
  1. A) Mercury
  2. B) Venus
  3. C) Mars
  4. D) Jupiter
The difference between nuclear reactor and atom bomb is that:
  1. A) There is no chain reaction in nuclear reactor where as this happens in atom bomb
  2. B) The chain reaction in nuclear reactor is controlled
  3. C) The chain reaction in nuclear reactor is not controlled
  4. D) Atom bomb is based on nuclear fusion whereas in nuclear reactor, nuclear fission occurs
Which of the following is NOT obtained from insects?
  1. A) Silk
  2. B) Honey
  3. C) Lac
  4. D) Pearl
The disease caused by swelling of the membrane over spinal cord and brain is:
  1. A) Leukaemia
  2. B) Paralysis
  3. C) Sclerosis
  4. D) Meningitis
Which among the following is a constituent of natural silk?
  1. A) Phosphorus
  2. B) Nitrogen
  3. C) Magnesium
  4. D) Potassium
Which Article of the Indian Constitution is related to Indian Foreign Policy?
  1. A) Article 380
  2. B) Article 312
  3. C) Article 60
  4. D) Article 51
The full form of SIM is:
  1. A) Subscriber’s Identity Module
  2. B) Subscriber’s Identity Machine
  3. C) Self Identity Machine
  4. D) Self Identity Module
Which one of the following is not an explosive matter?
  1. A) Trinitro toluene
  2. B) Dinitro glycerine
  3. C) Cyclo Trimethylene trinitrarmine
  4. D) Nitrochloroform