Angular velocity of second hand of a clock is from Physics NEET

Subject

Physics

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Angular velocity of second hand of a clock is

  • π30 rad/s

  • π60 rad/s

  • π15 rad/s

  • π2 rad/s


A.

π30 rad/s

Second hand of a clock turns through an angle 2 π in 1 min (= 60 s)

∴ angular velocity ω = 2π60

                              = π30 rad/s


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2.

Momentum of a body of mass 1 kg is 10 kg-m/s, then its kinetic energy will be

  • 100 J

  • 50 J

  • 1000 J

  • 200 J


3.

A wheel completes 2000 turns in completing a distance of 9.5 km, then diameter of the wheel is

  • 1.5 m

  • 1.5 cm

  • 7.5 m

  • 7.5 cm


4.

A satellite of mass m, revolving round a planet of mass M in a circular orbit of radius r, then orbital velocity of the satellite is

  • mgr

  • GMr

  • 2GMr

  • GMr


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5.

Sphere, disc and ring are allowed to roll down on an inclined plane from its top, then order in which they reach at the bottom will be

  • ring, disc, sphere

  • sphere, disc, ring

  • disc, ring, sphere

  • sphere, ring, disc


6.

Dimensions of torque is

  • [M1L2T-2]

  • [M2L2T2]

  • [M-1LT-1]

  • [M-2L-2T-2]


7.

If we made half the radius of earth, then duration of day will become

  • 6 h

  • 12 h

  • 24 h

  • 3 h


8.

A stone is dropped in 19.6 m depth well, echo is heard in  2.06 s, then velocity of sound is

  • 315.2 m/s

  • 320.5 m/s

  • 326.7 m/s

  • 332.4 m/s


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9.

An observer is coming towards plane mirror with a speed of 6 m/s, then apparent velocity of his image is

  • 6 m/s

  • 4 m/s

  • 12 m/s

  • 3 m/s


10.

Which of the following is scalar quantity?

  • Current

  • Velocity

  • Force

  • Acceleration


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