1st Year physics Chap#12 important questions

                               Academy  For  Excellence  Chung lahore

          Test –physics      Class: 1^st Year    Chap#12              Total  No # 20

Q#1    SHORT QUESTIONS                      (12)

1.       Give draw backs to use yhe period of pendulum as a time standard.

2.       Why do we find it useful to have two units for the amount of substance, the kilogram and the mole?

3.       The period of simple pendulum is measured by stop watch. What types of errors are possible in the time period?

4.       Can zero add to a null vector?

5.       Can a body rotate about its centre of gravity under the action of its weight?

6.       Can the magnitude of a vector have negative value?

Numericals.                                              (8)

1.       The line of action of force F = I - 2j  passes through a point whose position vector (- j + k ) is .Find the moment of F about the point  of which the position vector is I + k.

2.       find the angle of projection of a projectile for which its maximum height and horizontal range are equal.