Some commonly asked questions are:
4. Steepest gradient is highest speed .
5. The cyclist down the slope has weight component , hence acc downwards giving positive gradient. Along the horizontal road, friction is opp to his motion , hence acc is negative giving negative gradient.
11 The only vector triangle that has the 3 arrows forming a closed triangle and flowing in the same direction is A and D . D does not show W to be vertical ,hence A.
18. Particle B is at zero displacement. The particle to the right is displaced(-) towards B. The particle to the left is displaced(+) towards B also. Hence B is jammed in between the neighbouring particles. Hence it is compressed,
19. Summation of P and Q at time zero is Y. Shift P and Q a little towards each other , the resultant is Z . Hence the sequence is YZYX YZYX ....
25. Positive voltage shows presence of diode in forward biased. Negative voltage shows presence of ohmic device. Hence parallel connection of diode and resistor.
