The echo is heard of the time interval between the original sound and reflected one is..
(at least 0.1 second, less than 0.1 second, more than 0.2 second)

A body is freely dropped from a height h above the ground. Find the ratio of distances fallen in first one second, first two seconds, first three second ,also find the ratio of distances fallen in 1^(st) second, in 2^(nd) second, in 3^(rd) seconds

A man is standing on top of a building 100 m high. He throws two balls vertically, one at t = 0 and after a time interval (less than 2 seconds). The later ball is thrown at a velocity of half the first. The vertical gap between first and second ball is + 15 m at t = 2 s. The gap is found to remain constant. Calculate the velocity with which the balls were thrown and the exact time interval between their throw.

Periodic time for second pendulum is 1 second.

What is total diastolic time of ventricle in cardiac cycle? (A) 0.40 seconds (B) 0.30 second (C) 0.50 second (D) 0.10 second

The ratio of displacement and distance travelled for a moving body is (always more than 1, always less than 1, less than 1 or equal to 1)

The measure of the angle of intersection between y^(2)=x and x^(2)=y other than one at (0, 0) is …………

Two objects move in the same direction in a straight line. One moves with a constant velocity v_(1) . The other starts at rest and has constant acceleration a. They collide when the second object has velocity 2v_(1) . The distance between the two objects when the second one starts moving is :-