300 J of work is done in sliding a 2 kg block up an inclined pla

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 Multiple Choice QuestionsMultiple Choice Questions

131.

Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is

  • 0.5 N

  • 1.5 N

  • fraction numerator square root of 3 over denominator 4 end fraction space straight N
  • fraction numerator square root of 3 over denominator 4 end fraction space straight N
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132.

A shell of mass 200 g is ejected from a gun of mass 4 g by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is

  • 100 ms-1

  • 80 ms-1

  • 40 ms-1

  • 40 ms-1

1205 Views

133.

Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be

  • Mv newton

  • 2 Mv newton

  • Mv/2 Newton

  • Mv/2 Newton

708 Views

134.

A block B is pushed momentarily along a horizontal surface with an initial velocity v. if μ is the coefficient of sliding friction between B  and the surface, block B will come to rest after a time:

  • v/gμ

  • gμ/v

  • g/v

  • g/v

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135.

300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Taking =10 m/s2, work done against friction is

  • 200 J

  • 100 J

  • Zero

  • Zero


B.

100 J

Net work done in sliding a body up to a height h on inclined plane
    = Work done against gravitational force + Work done against frictional force

 

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136.

A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30° with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 s, the average force acting on the wall is

  • 48 N

  • 24 N

  • 12 N

  • 12 N

1088 Views

137.

The moment of inertia of a uniform circular disc of radius R and mass M about an axis touching the disc at its diameter and normal to the disc is

  • MR squared
  • 2 over 5 MR squared
  • 3 over 2 MR squared
  • 3 over 2 MR squared
1958 Views

138.

A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is: (Moment of inertia of rod about A is fraction numerator straight m l squared over denominator 3 end fraction)

  • fraction numerator 3 straight g over denominator 2 straight l end fraction
  • fraction numerator 2 straight l over denominator 3 straight g end fraction
  • fraction numerator 3 straight g over denominator 2 straight l squared end fraction
  • fraction numerator 3 straight g over denominator 2 straight l squared end fraction
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139.

Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]

  • 350 Hz

  • 311 Hz

  • 411 Hz

  • 411 Hz

1734 Views

140.

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current ‘I’ along the same direction is shown in Fig. Magnitude of force per unit length on the middle wire ‘B’ is given by

  • fraction numerator straight mu subscript straight o straight I over denominator 2 πd end fraction
  • fraction numerator 2 straight mu subscript straight o straight I over denominator πd end fraction
  • fraction numerator square root of straight mu subscript straight o straight I end root over denominator πd end fraction
  • fraction numerator square root of straight mu subscript straight o straight I end root over denominator πd end fraction
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