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6 .
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)
| A. |  |
| B. |  |
| C. |  |
| D. |  |
7 .
The uniIf the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be t of angular acceleration is
| A. |  |
| B. | same |
| C. | half |
| D. | double |
8 .
If a number of forces are acting at a point, theirresultant will be inclined at an angle θ with the horizontal, such that
| A. | tan θ = ∑H/∑V |
| B. | tan θ = ∑V/∑H |
| C. | tan θ = ∑Vx∑H |
| D. |  |
9 .
The range of a projectile is maximum, when the angle of projection is
| A. | 30° |
B. | 45° |
| C. | 60° |
D. | 90° |
10 .
The mechanical advantage of a lifting machine is the ratio of
| A. | distance moved by effort to the distance moved by load |
| B. | load lifted to the effort applied |
| C. | output to the input |
| D. | all of the above |
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