**Short Questions**

A small force applied on the smaller piston, results into a large force on the larger piston. Why? |

Calculate the density of 5 litres of water? |

Can we use a hydrometer to measure the density of milk? |

Define deforming force. |

Define density. Write its formula and unit? |

Define Elasticity. |

Define the term pressure. |

Describe briefly about the matter? |

Differentiate between stress and strain? |

Does there exist a fourth state of matter? What is that? |

How is a syringe filled with a liquid? |

How soap bubbles are produced. Why the soap bubbles so formed have spherical shapes? |

How the kinetic molecular model of matter helps differentiate various states of matter? |

Is an iron object heavier than that of wood? |

It is easy to remove air from a balloon but it is very difficult to remove air from a glass bottle why? |

On what factors pressure of the liquids depends? |

Show that atmosphere exerts pressure. |

State Pascal’s law. |

What changes are expected in the weather if barometer reading shows a sudden increase? |

What do you know about density of the Earth’s atmosphere? |

What does it mean when the atmospheric pressure at a place falls suddenly? |

What is a barometer? |

What is meant by density? What is its SI unit? |

What is meant by elasticity? |

What is strain? |

What is stress? |

Why does a piece of the stone sink in water but a ship with huge weight floats? |

Why does atmospheric pressure changes with altitude? |

Why hydraulic press is called as force multiplier. |

Why is 1cm cubed of wood lighter than 1 cm cubed of iron? |

Why water is not suitable to be used as the barometer? |

Write any three examples of pressure? |

Write down the density equations? |

Write factors effecting pressure: |

Write some applications of Pascal’s law. |

Write the procedure for measuring atmospheric pressure with the help of barometer? |

**Long Questions**

A cube of glass of 5 cm side and mass 306 g, has a cavity inside it. If the density of glass is 2.55 gcm⁻³. Find the volume of the cavity. |

A solid block of wood of density 0.6 gcm⁻³ weighs 3.06 N in air. Determine (a) volume of the block (b) the volume of the block immersed when placed freely in a liquid of density 0.9 gcm⁻³ ? |

A steel wire of cross-sectional area 2×m⁻⁵ m² is stretched through 2 mm by a force of 4000 N. Find the Young’s modulus of the wire. The length of the wire is 2 m. |

A student presses her palm by her thumb with a force of 75 N. How much would be the pressure under her thumb having contact area 1.5cm² ? |

A uniform rectangular block of wood 20 cm x 7.5 cm x 7.5 cm and of mass 1000g stands on a horizontal surface with its longest edge vertical. Find (i) The pressure exerted by the block on the surface (ii) Density of the wood. |

A wooden block measuring 40 cm x 10 cm x 5 cm has a mass 850 g. Find the density of 3 wood. |

Calculate the volume of the following objects: (i) An iron sphere of mass 5 kg, the density of iron is 8200 kgm⁻³ (ii) 200 g of lead shot having density 11300 kgm⁻³ (iii) A gold bar of mass 0.2 kg. The density of gold is 19300 kgm⁻³ |

Define Young’s Modulus and derive its mathematical formula. |

Determine the density of an object using the Archimedes principle? |

Explain how a submarine moves up the water surface and down into the water. |

Explain how a wooden block, ships and boats move up the water surface. |

Explain the braking system of the vehicles. |

Explain the Principle of Floatation. |

Explain the working of a hydraulic press. |

How density of an object can be found by Archimedes principle? |

How kinetic energy molecular model of matter helps differentiate various states of matter? |

How much would be the volume of ice formed by freezing 1 litre of water? |

Prove that (P = ρgh) |

Show that atmosphere exerts pressure. |

State and explain Archimedes Principle. |

State and explain the Hooke’s Law. |

State Archimedes Principle. |

State Pascal’s law with applications |

State relation for pressure beneath a liquid surface to depth and density? |

The density of air is 1.3 kgm⁻³. Find the mass of air in a room measuring 8m x 5m x 4m. |

The diameter of the piston of a hydraulic press is 30 cm. How much force is required to lift a car weighing 20 000 N on its piston if the diameter of the piston of the pump is 3 cm? |

The head of a pin is a square of side 10 mm. Find the pressure on it due to a force of 20 N. |

What do you know about Young’s modulus? How would you determine young’s modulus of an object? |

What is atmospheric pressure? And explain atmospheric pressure with the help of an |

What is Hook’s law? What is meant by elastic limit? |

What is upthrust? Explain the principle of floatation. |

Which device is used to measure the atmospheric pressure? Explain the measurement |

Write a note on variation in atmospheric pressure. |

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