NEET Physics: Questions 253 - 256 of 2098

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Question number: 253

» Rotational Motion » Torque

MCQ▾

Question

A constant torque of 700 N -m, turns a wheel of moment of inertia 50 kg -m 2 about an axis passing through the center. Angular velocity of the wheel after 2 s will be

Choices

Choice (4) Response

a.

1 rad/s

b.

15 rad/s

c.

28 rad/s

d.

5 rad/s

Question number: 254

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

Charges -q, Q and -q are placed at equal distance on a straight line. If the total potential energy of the system of three charges is zero, then find the ratio Q/q.

Three charge system placed at equal distance

Three Charge System Placed at Equal Distance

Charges -q, Q and -q are placed at equal distance (r) on a straight line.

Choices

Choice (4) Response

a.

34

b.

23

c.

12

d.

14

Question number: 255

» Electrostatics » Electric Field Due to a Point Charge

MCQ▾

Question

Two point charges Q and -3 Q are placed at some distance apart. If the electric field at the location of Q is E then, what will be at the locality of -3Q?

Choices

Choice (4) Response

a.

E3

b.

-E

c.

3E

d.

-3E

Question number: 256

» 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

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