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

Distinguish between speed and velocity.

Define one pascal (Pa), the S.I. unit of pressure.

State Pascal's law of transmission of pressure.

Name two applications of Pascal's law.

Explain the principle of a hydraulic machine. Name two devices which work on this principle.

Name and state the principle on which a hydraulic press works. Write one use of hydraulic press.

Draw a simple diagram of a hydraulic jack and explain its working.

Explain the working of a hydraulic brake with a simple labelled diagram.

In a hydraulic machine, a force of 2 N is applied on the piston of area of cross section 10 cm². What force is obtained on its piston of area of cross section 100 cm² ?

What should be the ratio of area of cross section of the master cylinder and wheel cylinder of a hydraulic brake so that a force of 15 N can be obtained at each of its brake shoe by exerting a force of 0.5 N on the pedal ?

The areas of pistons in a hydraulic machine are 5 cm² and 625 cm². What force on the smaller piston will support a load of 1250 N on the larger piston? State any assumption which you make in your calculation.

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.

Select the correct option.

One Pascal is equal to

Select the correct option.

Pressure applied in liquids is transmitted with undiminished force