# JEE Main Physics: Kinematics Set 2 Exam Quiz!

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Tanmay Shankar
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Questions: 10 | Attempts: 99

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• 1.

### Which of the following acceleration vs. time graphs represent the complete motion of an object thrown vertically upward?

B.
Explanation
Whenever a ball or an object is thrown in the upward direction, the whole motion is completed under gravity. In the first half of the motion, when the object is moving in the upward direction, gravity opposes the motion (Motion is in an upward direction whereas gravity is in a downward direction) that’s why the value of gravity is taken negatively. In the second half of the motion, when the object is moving in the upward direction, gravity supports the motion (Motion is in a downward direction and gravity is also in a downward direction) that’s why the value of gravity is taken positively.

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• 2.

### Which of the following pair of graphs represent the same motion?

• A.

1

• B.

2

• C.

3

• D.

4

A. 1
Explanation
Only the first pair of graphs represent the same motion as both graphs can be created with the help of other graph. In all other pairs, both the graphs can’t be derived from each other and that’s why they represent different motions.

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• 3.

### The figure shows the four paths of a ball hit by a batsman in the game of cricket. If there is no air resistance then which of the following is the correct order of the initial horizontal velocity component in decreasing order?

• A.

1>4>3>2

• B.

2>3>4>1

• C.

4>3>2>1

• D.

1>2>3>4

C. 4>3>2>1
Explanation
The range of any projectile is always proportional to the horizontal component of the initial velocity. In the question projectile, 4 has the longest range so projectile 4 has the highest value of the linear component of the initial velocity.

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• 4.

### A horizontally traveling bullet pierces a paper screen A and then B which are separated by a distance of 45 m. The hole made by the bulletin screen A is 20 cm above the hole in screen B. What will be the velocity of the bullet when it hits screen A? Neglect the resistance of paper and air.

• A.

450 m/s

• B.

225 m/s

• C.

332 m/s

• D.

625 m/s

B. 225 m/s
Explanation
The bullet is traveling horizontally so the vertical component of the velocity will be zero. The complete motion of the bullet will only be due to the horizontal velocity. Let the velocity of the bullet is V0, then the time taken by the bullet in travelling 45 m, T = 45/V0 Horizontal height travelled by the bullet Y = 0 +  gT2; 0.2 = 10T2 so T = 0.2s
Velocity of the bullet V0 = 45/0.2 = 225 m/s

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• 5.

### The centripetal acceleration of a particle moving in a circle of radius r is given as ac = n2rt2, where n is a positive constant. Which of the following option is correct for the above motion?

• A.

Speed of the particle =

• B.

Tangential acceleration of the particle =

• C.
• D.

None of these

C.
• 6.

C.
• 7.

D.
• 8.

### On the basis of the diagram which of the following statement is true:

• A.

Particle 1 will reach the ground first

• B.

All the particles will reach the ground simultaneously

• C.

All the particles will hit the ground with same speed

• D.

Only particle 2 and 3 will hit the ground with same speed

C. All the particles will hit the ground with same speed
• 9.

A.
• 10.

### An object is moving in a circular path of radius ‘R’ such that its speed ‘v’ varies as  where x is the distance and is a positive constant. What will be the acceleration of the object?

B.

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• Current Version
• Mar 19, 2023
Quiz Edited by
ProProfs Editorial Team
• Aug 07, 2014
Quiz Created by
Tanmay Shankar

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