NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 254 - 258 of 2184

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Question number: 254

» Rotational Motion » Torque

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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.

15 rad/s

b.

5 rad/s

c.

1 rad/s

d.

28 rad/s

Question number: 255

» Electrostatics » Electrostatic Potential Energy

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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.

b.

c.

d.

Question number: 256

» Electrostatics » Electric Field Due to a Point Charge

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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.

b.

-3E

c.

d.

-E

Question number: 257

» Rotational Motion » Angular Momentum

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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.

v

b.

c.

d.

None of the above

Question number: 258

» Kinematics » Average Speed and Instantaneous Velocity

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Question

A cricket ball of mass 150 g is moving with a velocity of 12m/sec and is hit by a bat so that the ball is turned back with a velocity of 20 m/sec; the force on the ball acts for 0.01 sec, then the average force exerted by the bat on the ball will be

Choices

Choice (4) Response

a.

480 N

b.

40 N

c.

400 N

d.

48 N