Rotational Motion (NEET Physics): Questions 13 - 15 of 123

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Question number: 13

» Rotational Motion » Angular Momentum

MCQ▾

Question

Two discs of moment of inertia 1 1 and I 2 and angular speeds 1 and 2 are rotating along collinear axes passing through their center of mass and perpendicular to their plane. If the two are made to rotate combined along the same axis the rotational KE of system will be

Choices

Choice (4) Response

a.

I1ω1+I2ω22(I1+I2)

b.

(I1ω1+I2ω2)22(I1+I2)

c.

(I1+I2)(ω1+ω2)22 v

d.

None of the above

Question number: 14

» Rotational Motion » Angular Momentum

MCQ▾

Question

Two uniforms discs of equal mass but unequal radii are mounted on fixed horizontal exiles. Light strings are wrapped on each of the discs. The strings are pulled by constant equal forces F for same amount of time as shown in the figure.

Disc I and Disc II and force applied to it

Disc I and Disc II and Force Applied to It

We show two uniform discs of equal mass but unequal radii

Angular momenta of discs are L 1 and L 2 and their kinetic energies are K 1 and K 2. Which of the following statements true

(1) L 1 = L 2

(2) L 1 < L 2

(3) K 1 > K 2

(4) K 1 = K 2

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

Question number: 15

» Rotational Motion » Torque

Assertion-Reason▾

Assertion (Ꭺ)

It is harder to open and shut the door if we apply force near the hinge.

Reason (Ꭱ)

Torque is maximum at hinge of the door.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

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