Test Details

Force and Laws of Motion

Jan 30, 6:45 PM

25 minutes

Jan 31, 4:00 PM

30.0 marks

MCQ

15 questions

Pankaj kumar yadav

Class Details

Maths

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Question Text

Question 1 :
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other. How will this activity affect the position of the two? Explain your answer.

Question 2 :
A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. lts velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. What is the acceleration?

Question 3 :
There are three solids made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have highest inertia?

Question 4 :
A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then what is the net accelerating force?

Question 5 :
Water sprinkler used for grass lawns begins to rotate as soon as the water is supplied. Explain the principle on which it works.

Question 6 :
Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will they move with the same speed?

Question 7 :
An object of mass 100 kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6s. What is the initial and final momentum of the object?

Question 8 :
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, what will be the net force of person who catches it?

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e3f59b460d7261f64d.jpg' /> The above image is the distance-time table of an object in motion. What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?

Question 10 :
An object of mass 2 kg is sliding with a constant velocity of $4ms^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Question 11 :
What is the momentum of an object of mass m, moving with a uniform velocity v?

Question 12 :
A stone of 1 kg is thrown with a velocity of 20 m/s across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

Question 13 :
Which of the following has more inertia, a bicycle or a train?

Question 14 :
Two objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m/s before the collision during which they stick together. What will be the velocity of the combined object after the collision?

Question 15 :
A bullet of mass 10 g travelling horizontally with a velocity of 150 m/s strikes a stationary wooden block and comes to rest in 0.03 s. What is the distance of penetration of the bullet into the block?

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