1:   At critical temperature the surface tension of a liquid ---------
Options:
  1. is infinity
  2. is zero
  3. 70 dynes/cm
  4. 50 dynes/cm

Answer: Option 2

Explanation:

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2:   With the rise of temperature, the angle of contact of liquid ---------
Options:
  1. decreases
  2. increases
  3. first increases then decreases
  4. remains the same

Answer: Option 2

Explanation:

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3:   A dental plate clings to the roof of the mouth because ----------
Options:
  1. force of cohesion increases
  2. force of adhesion increases
  3. contain both force of adhesion and cohesion
  4. force of adhesion decreases

Answer: Option 2

Explanation:

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4:   Rise in mercury in a barometer is an indication of ------------
Options:
  1. fair weather
  2. storm
  3. both of the above
  4. none of the above

Answer: Option 1

Explanation:

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5:   For a ship to be in stable equilibrium ,which part of it must be weighed?
Options:
  1. The keel
  2. The deck
  3. The observation tower
  4. all of the above

Answer: Option 1

Explanation:

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6:   A boy carrying a bucket partly filled with water in one hand and a fish in the other puts the fish into the water without spilling.The total weight he carries ---------
Options:
  1. increases
  2. decreases
  3. remains the same
  4. all of the above

Answer: Option 3

Explanation:

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7:   In which of the following medium will a toy car weigh the maximum ?
Options:
  1. water
  2. glycerine
  3. vacuum
  4. carbondioxide

Answer: Option 3

Explanation:

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8:   The line marked on the sides of a ship to indicate the safe loading limit are known as ---------
Options:
  1. safety lines
  2. limit lines
  3. danger lines
  4. plimsol lines

Answer: Option 4

Explanation:

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9:   A bucket partly filled with water is suspended from a spring balance.A stick held in hand is lowered into the water without touching the sides or the bottom.The reading of the balance will -----------
Options:
  1. decreases
  2. increases
  3. no change at all
  4. first increases then decreases

Answer: Option 2

Explanation:

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10:   A hydrogen filled balloon expands as it rises and may even burst after rising very high in he atmosphere.This happens because
Options:
  1. the temperature decreases with the height
  2. the temperature increases with the height
  3. the atmospheric pressure increases with height
  4. all of the above

Answer: Option 3

Explanation:

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Dogs are not our whole life, but they make our lives whole.
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