Basic Science Practice Question and Answer

Q:

Which of the following hitting methods has the highest power factor?

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  • 1
    heating resistance
    Correct
    Wrong
  • 2
    induction heating
    Correct
    Wrong
  • 3
    Arc heating
    Correct
    Wrong
  • 4
    Dielectric heating
    Correct
    Wrong
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Answer : 1. "heating resistance"
Explanation :

The correct answer is Resistance Heating. Resistance heating is based on the I2R effect and is highly resistive in nature that's why it has the maximum power factor. Electric resistance heating is defined as “the heat produced by passing an electric current through a material that preferably has high resistance”.

Q:

Who propounded the term ecology?

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  • 1
    Charles Darwin
    Correct
    Wrong
  • 2
    Robert Whitaker
    Correct
    Wrong
  • 3
    Arthur Tansley
    Correct
    Wrong
  • 4
    Ernest Hackle
    Correct
    Wrong
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Answer : 4. "Ernest Hackle"

Q:

The first Indian Satellite Aryabhatta was launched in

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  • 1
    1974
    Correct
    Wrong
  • 2
    1975
    Correct
    Wrong
  • 3
    1976
    Correct
    Wrong
  • 4
    1977
    Correct
    Wrong
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Answer : 2. "1975"
Explanation :

The Aryabhata spacecraft, named after the famous Indian astronomer, was India's first satellite; it was completely designed and fabricated in India and launched by a Soviet Kosmos-3M rocket from Kapustin Yar on April 19, 1975.

Q:

Tungsten resistance to temperature rise?

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  • 1
    decreases
    Correct
    Wrong
  • 2
    increases
    Correct
    Wrong
  • 3
    there is no change
    Correct
    Wrong
  • 4
    All these
    Correct
    Wrong
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Answer : 2. "increases"
Explanation :

At high temperatures, the tungsten filament gets hot and atoms in the filament vibrate more. The electrons in the current now collide more with the atoms & more energy is needed to push the current through the filament. Hence, the resistance of tungsten increases with temperature.

Q:

Which of the gas is not known as green house gas?

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  • 1
    Methane
    Correct
    Wrong
  • 2
    Hydrogen
    Correct
    Wrong
  • 3
    Nitrous oxide
    Correct
    Wrong
  • 4
    Carbon dioxide
    Correct
    Wrong
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Answer : 2. "Hydrogen"
Explanation :

Whereas oxygen, nitrogen, and argon are not examples of greenhouse gases.


Q:

Most commonly used motor in motor generator sets of high capacity?

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  • 1
    Cage Model Induction Motor
    Correct
    Wrong
  • 2
    synchronous motor
    Correct
    Wrong
  • 3
    DC Compounder Motor
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 2. "synchronous motor"
Explanation :

The tendency nowadays is to use synduction or synchronous motors. The synduction motor resembles an induction motor but runs at synchronous speed.

Q:

Why put a wooden handle in the kettle?

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  • 1
    because of fashion
    Correct
    Wrong
  • 2
    Wood is a bad conductor of heat and the handle is not hot
    Correct
    Wrong
  • 3
    is light
    Correct
    Wrong
  • 4
    None of these
    Correct
    Wrong
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Answer : 2. "Wood is a bad conductor of heat and the handle is not hot"

Q:

Bleaching powder contains ______ bleaching agent.

2204 0

  • 1
    Bromine
    Correct
    Wrong
  • 2
    Iodine
    Correct
    Wrong
  • 3
    Hydrogen
    Correct
    Wrong
  • 4
    Chlorine
    Correct
    Wrong
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Answer : 4. "Chlorine "

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