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

A force of 50 kgf is applied to the smaller piston of a hydraulic machine. Neglecting friction, find the force exerted on the large piston, if the diameters of the pistons are 5 cm and 25 cm respectively.

What force is applied on a piston of area of cross section 2 cm² to obtain a force 150 N on the piston of area of cross section 12 cm² in a hydraulic machine?

What is an electromagnet?

66640 Pa pressure is exerted by 0.50 m vertical column of a liquid. If g = 9.8 Nkg⁻¹, calculate the density of the liquid.

The area of cross-sections of the pump plunger and press plunger of a hydraulic press is 0.02 m² and 8 m² respectively. If the hydraulic press overcomes a load of 800 kgf, calculate the force acting on the pump plunger.

If the mechanical advantage of the handle of the pump plunger is 8, calculate the force applied at the end of the handle of the pump plunger.

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One Pascal is equal to

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Pressure applied in liquids is transmitted with undiminished force

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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.