Q1: The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane

ANS:B - to be maximum

1. To be zero: The range of the projectile cannot be zero unless the projectile doesn't leave the inclined plane. So, this option is not correct.
2. To be maximum: The range of the projectile on the inclined plane would be maximum when the projection direction is parallel to the inclined plane. In this case, the projectile would spend the maximum time in the air, resulting in the maximum range.
3. To be minimum: The range of the projectile on the inclined plane would be minimum when the projection direction is perpendicular to the inclined plane. In this case, the projectile would not move horizontally along the inclined plane but would fall vertically downward, resulting in the minimum range.