91.  One planet is observed from two diametrically opposite point A and B on the earth the angle subtended at the planet by the two directions of observations is . Given the diameter of the earth to be about . What will be distance of the planet from the earth ?

92.  Find the distance at which 4 AU would subtend an angle of exactly 1" of arc.

93.  The percentage error in the distance is

94.  In an experiment to determine the density of a cube the percentage error in the measurement of mass is 0.25 % and the percentage error in the measurement of length is 0.50 % what will be the percentage error in the determination of its density ?

95.  If the fractional error in A is

96.  If where percentage error in A , B and C are respectively %, % and % then total percentage error in measurement of P

97.  In the experiment of simple pendulum error in length of pendulum () is 5 % and that of is 3 % then find percentage error in measurement of periodic time for pendulum

98.  Acceleration due to gravity is given by what is the equation of the fractional error in measurement of gravity g ? [G & M constant]

99.  The period of oscillation of a simple pendulum is given by what is the equation of the relative error in measurement of period T ?

100.  The length of a rod is what is the length of two such rods ?