Basic Science Practice Question and Answer

Q:

What is the coupling of primary and secondary coils in a transformer?

2124 0

  • 1
    Electrical
    Correct
    Wrong
  • 2
    Mechanical
    Correct
    Wrong
  • 3
    Magnetic
    Correct
    Wrong
  • 4
    All these
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 3. "Magnetic"
Explanation :

The secondary coil is also generating a magnetic field that is growing and shrinking just like the field in the primary coil. This coupling of magnetic energy between these two coils is called mutual induction.

Q:

Capacity when connecting capacitors to series?

2123 1

  • 1
    neither increases nor decreases
    Correct
    Wrong
  • 2
    increases
    Correct
    Wrong
  • 3
    decreases
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 2. "increases"
Explanation :

A capacitor stores energy in the form of an electrostatic field between its plates. Increasing the size of the plates increases the capacitance because there is more room for the electrons to escape.

Q:

Rust on iron?

2104 0

  • 1
    ferric oxide
    Correct
    Wrong
  • 2
    Hydrated ferrous and ferric oxide
    Correct
    Wrong
  • 3
    Alkali ferrous and ferric carbonate
    Correct
    Wrong
  • 4
    Because of all of the above
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 4. "Because of all of the above"

Q:

Which gas is used to purify pond water in cities?

2091 0

  • 1
    Sulfur dioxide
    Correct
    Wrong
  • 2
    Chlorine
    Correct
    Wrong
  • 3
    Nitrogen
    Correct
    Wrong
  • 4
    Ammonia
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 2. "Chlorine"

Q:

Which of the following is not a natural polymer?

2087 0

  • 1
    Wool
    Correct
    Wrong
  • 2
    Leather
    Correct
    Wrong
  • 3
    Nylon
    Correct
    Wrong
  • 4
    Silk
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 3. "Nylon"
Explanation :

The correct answer is the Glyptal. The term "natural polymers" refers to compounds that are produced naturally. Glyptal is a synthetic polymer and does not exist in nature. The polymer substance formed from glycerol and phthalic acid is known commercially as glyptal.

Q:

From which source is the list of countries emitting carbon dioxide based on carbon dioxide emissions?

2082 0

  • 1
    Burning of fossil fuels
    Correct
    Wrong
  • 2
    Cement Industry
    Correct
    Wrong
  • 3
    Both of the above
    Correct
    Wrong
  • 4
    None of these
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 3. "Both of the above"
Explanation :

This is a list of sovereign states and territories by carbon dioxide emissions due to certain forms of human activity, based on the EDGAR database created by European Commission and Netherlands Environmental Assessment Agency.

Q:

The average salinity of sea water is

2081 0

  • 1
    2%
    Correct
    Wrong
  • 2
    3%
    Correct
    Wrong
  • 3
    3.5%
    Correct
    Wrong
  • 4
    2.5%
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 3. "3.5%"
Explanation :

The average salinity of sea water is 3.5% or 35 parts per thousand. In other words, for every 1 litre of sea water there is 35 grams of dissolved salts (NaCl) .


Q:

capacitor is a of small size but high capacity?

2081 1

  • 1
    mica capacitor
    Correct
    Wrong
  • 2
    electrolytic capacitors
    Correct
    Wrong
  • 3
    Sirasic capacitor
    Correct
    Wrong
  • 4
    Paper capacitor
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 1. "mica capacitor"

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully