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

The weight of a body on Earth is 98 N, where acceleration due to gravity is 9.8 m s^-2. What will be its (a) mass and (b) weight on the Moon, where acceleration due to gravity is 1.6 m s^-2?

What is the (a) force of gravity and (b) weight of a block of mass 10.5 kg ? Take g = 10 ms^-2 .

Assuming the density of air to be 1.295 kg m^-3, find the fall in barometric height in mm of Hg at a height of 107 m above the sea level. Take density of mercury = 13.6 × 10³ kg m^-3.

A body dipped into a liquid experiences an upthrust. State two factors on which upthrust on the body depends. 

A body of density ρ is immersed in a liquid of density ρ_L. State the condition when the body will (i) float and (ii) sink in the liquid. 

A body held completely immersed inside a liquid experiences two forces:

(i) F₁, the force due to gravity and

(ii) F₂, the buoyant force.

Draw a diagram showing the direction of these forces acting on the body and state the condition when the body will float or sink. 

Complete the following sentence :

An empty tin container with its mouth closed has an average density equal to that of a liquid. The container is taken 2 m below the surface of that liquid and is left there. Then the container will ____________ .

A bunch of feathers and a stone of the same mass are released simultaneously in air. Which will fall faster and why? How will your observation be different if they are released simultaneously in vacuum?

A body of density ρ sinks in a liquid of density ρ_L.  The densities ρ and ρ_L are related as :

A body of volume 100 cm³ weighs 5 kgf in air. It is completely immersed in a liquid of density 1.8 × 10³ kg m^-3. Find:

1. The upthrust due to liquid and
2. The weight of the body in liquid. 

A piece of brass weighs 175 gf in air and 150 gf when fully submerged in water. The density of water is 1.0 g cm^-3.

(i) What is the volume of the brass piece? (ii) Why does the brass piece weigh less in water? 

Define the term density. 

What are the units density in (i) C.G.S. and (ii) S.I. system .

Express the relationship between the C.G.S. and S.I. units of density. 

'The density of iron is 7800 kg m^-3'. What do you understand by this statement?

Write the density of water at 4°C in S.I. unit .

Water is heated from 0°C to 10°C . How does the density of water change with temperature?

Complete the following sentence.

Density of water is .... ... kg m^-3.

A body weighs W gf in air and W₁ gf when it is completely immersed in water. Find: (i) Volume of the body, (ii) Upthrust on the body and (iii) Relative density of the material of the body.