English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Three speed-time graphs are given below :

 Which graph represents the case of:
(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower ?
(ii) a trolley decelerating to a constant speed and then accelerating uniformly ?

Study the speed-time graph of a car given alongside and answer the following questions:

(i) What type of motion is represented by OA ?
(ii) What type of motion is represented by AB ?
(iii) What type of motion is represented by BC ?
(iv) What is the acceleration of car from O to A ?
(v)What is the acceleration of car from A to B ?
(vi) What is the retardation of car from B to C ?

What type of motion is represented by the following graph ?

What type of motion is represented by the following graph ?

What type of motion is represented by the following graph ?

What type of motion is represented by the following graph ?

Write the common unit of density.

What is the density of water in SI units ?

What is the value of relative density of water ?

Why does ice float in water ?

The density of a body is 800 kg/m3. Will it sink or float when dipped in a bucket of water ? (Density of water = 1000 kg/m³).

Fill in the blank with suitable word :
A heavy ship floats in water because its....................density is less than that of water.

A mug full of water appears light as long as it is under water in the bucket than when it is outside water. Why ?

Explain why, big boulders can be moved easily by flood.

An iron nail sinks in water but it floats in mercury. Why ?

Explain why, a piece of glass sinks in water but it floats in mercury.

Steel sinks in water but a steel boat floats. Why ?

Why does a ship made of iron and steel float in water whereas a small piece of iron sinks in it ?

Name the force the upward push of water on a submerged object .