# Kinematics

7 Questions | Total Attempts: 88

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Objective quiz for iitjee

• 1.
As an object falls freely in vacuum, its
• A.

1velocity increases

• B.

2acceleration increases

• C.

3both velocity and acceleration increases

• D.

4only distance increases

• 2.
A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed of the ball when caught would be
• A.

Less than the speed it had when thrown upwards.

• B.

More than the speed it had when thrown upwards.

• C.

The same as the speed it had when thrown upwards.

• 3.
Suppose an object is in free fall. Each second the object falls
• A.

The same distance as in the second before.

• B.

A larger distance as in the second before.

• C.

With the same average speed

• D.

With the same instantaneous speed.

• 4.
A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 ms−1. Which of the following statement(s) is (are) correct for the system of these two masses?
• A.

Total momentum of the system is 3 kg ms−1

• B.

Momentum of 5 kg mass after collision is 4 kg ms−1

• C.

Kinetic energy of the centre of mass is 0.80 J

• D.

Total kinetic energy of the system is 4J

• 5.
A student uses a simple pendulum of exactly 1m length to determine g, the acceleration due to gravity. He uses a stop watch with the least count of 1 sec for this and records 40 seconds for 20 oscillations. For this observation, which of the following statement(s) is (are) true?
• A.

Error in measuring T, the time period, is 0.04 seconds

• B.

Error in measuring T, the time period, is 1 second

• C.

Percentage error in the determination of g is 5%

• D.

Percentage error in the determination of g is 2.5%

• 6.
At the highest point of flight of a ball thrown upwards,
• A.

The acceleration is zero.

• B.

The acceleration is the minimal.

• C.

the acceleration is directed downwards

• D.

the acceleration is directed upward

• 7.
A free falling object is dropped from a height from rest. After falling for 1 second, the speed is about
• A.

5m/s

• B.

4.9m/s

• C.

10m/s

• D.

9.8m/s

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