Fluid Mechanics

1. Barometer is used to measure

  1. pressure in pipes, channels etc.
  2. atmospheric pressure
  3. very low pressure
  4. difference of pressure between two points
  5. rain level.

Correct answer: (B)
atmospheric pressure

2. Mercury is often used in barometer because

  1. it is the best liquid
  2. the height of barometer will be less
  3. its vapour pressure is so low that it may be neglected
  4. both (b) and (c)
  5. it moves easily.

Correct answer: (D)
both (b) and (c)

3. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea

  1. Venturimeter
  2. Orifice plate
  3. hot wire anemometer
  4. rotameter
  5. pitot tube.

Correct answer: (E)
pitot tube.

4. Which of the following instrument can be used for measuring speed of an aeroplane

  1. Venturimeter
  2. Orifice plate
  3. hot wire anemometer
  4. rotameter
  5. pitot tube.

Correct answer: (E)
pitot tube.

5. A balloon lifting in air follows the following principle

  1. law of gravitation
  2. Archimedes principle
  3. principle of buoyancy
  4. all of the above
  5. continuity equation.

Correct answer: (D)
all of the above

6. A body floats in stable equilibrium

  1. when its meatcentric height is zero
  2. when the metancentre is above e.g.
  3. when its e.g. is below it's center of buoyancy
  4. metacentre has nothing to do with position of e.g. for determining stability
  5. none of the above.

Correct answer: (B)
when the metancentre is above e.g.

7. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

  1. increase
  2. decrease
  3. remain same
  4. increase/decrease depending on depth of immersion
  5. unpredictable.

Correct answer: (C)
remain same

8. A fluid in equilibrium can't sustain

  1. tensile stress
  2. compressive stress
  3. shear stress
  4. bending stress
  5. all of the above.

Correct answer: (C)
shear stress

9. A fluid is said to be ideal, if it is

  1. incompressible
  2. inviscous
  3. viscous and incompressible
  4. inviscous and compressible
  5. inviscous and incompressible.

Correct answer: (E)
inviscous and incompressible.

10. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to

  1. 10 kg
  2. 100 kg
  3. 1000 kg
  4. 1 kg
  5. 10,000 kg.

Correct answer: (A)
10 kg

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