CBSE Class 9   CBSE Class 9 Science

About the CBSE Class 9 Science category (1)
When the wire of a guitar is plucked (3)
Two identical bullets are fired one by a light rifle and the other by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why? (2)
Force and laws of motion (1)
State four differences between longitudinal and transverse waves. Give an example of each (2)
Figure shows a conveyor belt transporting a package to a raised platform. The belt is driven by a motor (1)
A car of mass 900 kg is travelling at a steady speed of 30 m/s against a resistive force of 2000 N, as illustrated in figure (1)
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it (1)
A light and a heavy object have the same momentum, find out the ratio of their kinetic energies. Which one has a larger kinetic energy (1)
Show that when a body is dropped from a certain height, the sum of its kinetic energy at any instant during its fall is constant (1)
Briefly describing the gravitational potential energy (1)
A body thrown at a certain angle to the ground moves in a curved path and falls back to the ground (1)
Two workmen are employed on a building project, as shown in figure (1)
Figure shows, in order, five stages of an athlete successfully performing a pole-vault (1)
Give one example of each of the following: Small mass but high kinetic energy (1)
A cube of side 5 cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force (1)
The velocity of a body moving in a straight line is increased by applying a constant force (1)
Explain, with the help of an example the difference between the terms thrust and pressure. Which one of the two has same SI unit as that of Forc (1)
Avinash can run at a speed of 8 ms-1 against the frictional force of 10 N, and Kapil can move at a speed of 3 ms-1 against the frictional force of 25 N. Who is more powerful and why? (1)
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies? (1)
State and explain the experiment for verification of Archimedes’ principle. Name the devices based on Archimedes’ principle (1)
Derive an expression for kinetic energy of an object (1)
What types of energy transformation takes place in the following: (1)
Loaded test-tube placed in pure milk sinks to a certain mark (M) (1)
Give three examples when the object is not displaced in spite of a force acting on it (1)
How is a submarine able to move on as well as go under water? (1)
Give any three applications of Archimedes’ principle (1)
Observe the diagrams I and II carefully (1)
State the factors on which buoyant force depends (1)
State the laws of liquid pressure (1)