Previous year MCQs

General science UPPSC 2006 GS-I
Question

Transformer is used for

Answer & Solution

Answer: (Detailed Solution Below)

Option D: To step up or step down AC voltages

Detailed Solution:

The correct answer is “To step up or step down AC voltages”.
Transformers are primarily used to either increase (step up) or decrease (step down) alternating current (AC) voltages while keeping the frequency constant.

Similar Questions:

Solder used in soldering metal pieces consists of an alloy of:
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  2. B) Tin and Lead
  3. C) Zinc and Lead
  4. D) Zinc and Copper
Refrigeration helps in food preservation by
  1. A) killing of germs (bacteria)
  2. B) reducing the rate of biochemical reaction
  3. C) destroying the enzyme action
  4. D) sealing food with a layer of ice
The phenomenon used in optical fibre for transmission of light energy is
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  3. C) Human species
  4. D) Mosquito species
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  2. B) Carbon monoxide
  3. C) Hydrogen
  4. D) Methane
Given below are two statements:

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Reason (R): Powers of removal of Election Commissioners is with the executive.

In the context of above, which one of the following is correct?
Code:
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1. Fibre optics is based on the principle of total internal reflection.
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3. Optical fibre communications are free from radio frequency interference.
4. In India, Reliance group of Industries is engaged in the manufacture of optical fibre.

Of these statements:
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  2. B) 1, 2 and 4 are correct
  3. C) 1, 3 and 4 are correct
  4. D) 2, 3 and 4 are correct
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  2. B) Sarojini Naidu
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