(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

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A dam for water reservoir is built thicker at the bottom than at the top because

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The pressure exerted by 50 kg (g = 10 m/s⁻²) on an area of cross-section of 2 m² is

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Pressure at a point inside a liquid does not depend on

At a given place, a barometer records 70 cm of Hg. If the mercury in the barometer is replaced by water, what would be resulting in reading? (Density of Hg = 13600 kg/m³; Density of water = 1000 kg/m³)

The pressure in the water pipe on the ground floor of a building is 40000 pascals, whereas on the first floor it’s 10000 pascals. Find the height of the first floor. (Acceleration due to gravity g = 10 ms⁻²)

Define the SI unit of pressure.

The atmospheric pressure at a place is 650 mm of Hg. Calculate this pressure in Pascals (Pa).

P is the pressure at some point in a liquid. State whether pressure P is a scalar or vector quantity.

Compare approximately the speed of sound in air, water, and iron.

How does the speed of sound in air vary with the temperature?

Describe a simple experiment to determine the speed of sound in air.

How does speed differ from velocity?

When do the speed and velocity of a moving body become equal?

How does the liquid pressure on a diver change according to the following condition:

When the driver moves horizontally

How does the liquid pressure on a diver change according to the following condition:

When the driver moves to the greater depth?

The following figure shows a manometer containing a liquid of density p. The limb P of the manometer is connected to a vessel V and the limb Q is open to atmosphere. The difference in the levels of liquid in the two limbs of the manometer is h as shown in the diagram. The atmospheric pressure is P₀.

(i) What is the pressure on the liquid surface in the limb Q?

(ii) What is the pressure on the liquid surface in the limb P?

Name three applications of Pascal's law.

What is the use of altimeter?