Which one of the following instruments is used to measure the pressure ?

  1. Ammeter
  2. Manometer
  3. Lactometer
  4. Picometer

Answer (Detailed Solution Below)

Option 2 : Manometer
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RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

Detailed Solution

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CONCEPT:

Manometers:

  •  It is a pressure measuring device which are based on the principle of balancing the column of liquid (whose pressure is to be found) by the same or another column of liquid.

  • In order to prevent the capillary action from affecting the height of the column of liquid in a manometer, the glass tube having an internal diameter of less than 12 mm should not be used.

EXPLANATION:

  • It is the device to measure current and is always put in connected in series across the device the current is to be measured.
    • Ideally, the ammeter has zero resistance.
  • A lactometer is an instrument that is used to check for the purity of milk by measuring its density.
    • It can find out the content of water in the milk or to test the richness of the milk. The lactometer works on the principle of gravity of milk.
  • Picometer is a unit of distance

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