Test Details

Force law of motion

Nov 10, 6:10 PM

75 minutes

Nov 10, 7:25 PM

30.0 marks

MCQ

15 questions

Sidhartha Diwan

Teacher has experienced of 8 years of teaching. Edu qualifications : M. Tech. .I believe to give knowledge to the students 10% higher then your subject teacher of school. I am not tutor I am mentor.I'm also writing a book of History for different compition examinations like : UPSC

Class Details

Science : Physics

Class 9

Science : Physics

I will explain not only all the concept of your book but also I will give extra knowledge to you.Even we will solve compositional question .Our class Moto is learn with fun.

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Question Text

Question 1 :
 A heavier body moving with certain velocity collides head on elastically with a lighter body at rest. Then

Question 2 :
A 6 kg mass travelling at $2.5$ ms$^{-1}$collides head on with a stationary 4 kg mass. After the collision the 6 kg mass travels in its original direction with a speed of $1$ ms$^{-1}$. The final velocity of 4 kg mass

Question 3 :
The momentum of a body of given mass is proportional to its:

Question 5 :
A wagon of mass 10 tons moving at a speed of 12 kmph collides with another wagon of mass 8 tons moving on the same track in the same direction at a speed of 10 kmph. If the speed of the first wagon decreases to 8 kmph. Find the speed of the other after collision

Question 6 :
A body of mass 5 kg moving with a speed of $ 3 ms^{-1}$collides head on with a body of mass 3 kg moving in the opposite direction at a speed of $2 ms^{-1}$. The first body stops after the collision. Find the final velocity of the second body.

Question 7 :
N bullets each of mass $m \ kg$ are fired with a velocity $v \ ms^{-1}$ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

Question 8 :
A ball of mass $m$ moving with velocity $v$ collides elastically with wall and rebounds. The change in momentum of the ball will be :

Question 9 :
Write true or false for the following statements: Impulse represents the rate of change of momentum of a body.

Question 10 :
Assertion: Water at the foot of the water fall is always at different temperature from that at the top. Reason: The potential energy of water at the top is converted into heat energy during falling

Question 11 :
Assertion: A bullet is fired from a rifle. If the rifle recoils freely, the kinetic energy of rifle is more than that of the bullet. Reason: In the case of rifle bullet system the law of conservation of momentum violates.

Question 12 :
A ball$A$ is moving with velocity $5 m/s$ collides elastically with another identical ball $B$ which is initially at rest such that the velocity of $B$ after the collision makes an angle of $37^\circ $ with the initial velocity of $A$. Then the INCORRECT  statement is :

Question 13 :
A bullet weighing 10 g and moving at 300 ms$^{-1}$ strikes a 5 kg block of ice and drops dead. The ice block is sitting on frictionless level surface. The speed of the block, after the collision is :

Question 15 :
A rocket is propelled by a gas which is initially at a temperature of $4000 \ K$. The temperature of the gas falls to $1000 \ K$ as it leaves theexhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle is

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