Kinematics-Uniformly Accelerated Motion [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 5 of 48

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Question 1

Question MCQ▾

The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t – t3 during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –

Choices

Choice (4)Response

a.

2 rad/sec

b.

1 rad/sec

c.

4 rad/sec

d.

3 rad/sec

Edit

Question 2

Question MCQ▾

The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t – t2 during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –

Choices

Choice (4)Response

a.

rad/sec

b.

rad/sec

c.

rad/sec

d.

rad/sec

Edit

Question 3

Question MCQ▾

Using rectangular co-ordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) -

Choices

Choice (4)Response

a.

b.

-2 r

c.

-2r2

d.

r2

Edit

Question 4

Question MCQ▾

The angular velocity of a particle is given by co = 1.51 - 3t2 + 2, the time when its angular acceleration decreases to be zero will be -

Choices

Choice (4)Response

a.

25 sec

b.

1.2 sec

c.

0.25 sec

d.

12 sec

Edit

Question 5

Question Assertion-Reason▾

Assertion(Ꭺ)

In non-uniform circular motion, velocity vector and acceleration vector are not perpendicular to each other.

Reason(Ꭱ)

In non-uniform circular motion, particle has normal as well as tangential acceleration.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Edit