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pressure-Basic

Dear Readers,

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The pressure at the bottom of a tank containing a liquid does not depend on

  •  Acceleration due to gravity
  •  Height of the liquid column
  •  Area of the bottom surface
  •  Nature of the liquid

Area of the bottom surface

Q2. When a large bubble rises from the bottom of a lake to the surface. Its radius doubles. If atmospheric pressure is equal to that of column of water height H, then the depth of lake is

  •  H
  •  2H
  •  7H
  •  8H

7H

Q3. The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake is

  •  5 m
  •  10 m
  •  15 m
  •  20 m

15 m

Q4. The value of g at a place decreases by 2%. The barometric height of mercury

  •  Increases by 2%
  •  Decreases by 2%
  •  Remains unchanged
  •  Sometimes increases and sometimes decreases

Increases by 2%

Q5. Two stretched membranes of area 2 cm2 and 3 cm2 are placed in a liquid at the same depth. The ratio of pressures on them is

  •  1:1
  •  2:3
  •  3:2
  •   22 : 32

1:1

Q6. Three identical vessels are filled to the same height with three different liquids A, B and C . The pressure at the base will be

  •  Equal in all vessels
  •  Maximum in vessel A
  •  Maximum in vessel B
  •   Maximum in vessel C

Maximum in vessel A

Q7. Three identical vessels are filled with equal masses of three different liquids A, B and C . The pressure at the base will be

  •  Equal in all vessels
  •  Maximum in vessel A
  •  Maximum in vessel B
  •  Maximum in vessel C

Equal in all vessels

Q8. A barometer kept in a stationary elevator reads 76 cm. If the elevator starts accelerating up the reading will be

  •  Zero
  •  Equal to 76 cm
  •  More than 76 cm
  •  Less than 76 cm

More than 76 cm

Q9. A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out, the pressure in the liquid near the bottom of the liquid will

  •  Increases
  •  Decreases
  •  Remain constant
  •  First decrease and then increase

Decreases

Q10. A barometer tube reads 76 cm of mercury. If the tube is gradually inclined at an angle of 60o with vertical, keeping the open end immersed in the mercury reservoir, the length of the mercury column will be

  •  152 cm
  •  76 cm
  •  38 cm
  •  37 cm

152 cm



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