When two stimuli are applied to the muscle with the second following the first closely enough in time, a large contraction occurs on the application of the second stimulus. Explain.

When a threshold stimulus is applied to a muscle, the muscle fibres will contract fully or will not contract at all. This is known as:

Which of the following changes occurs when a skeletal muscle contracts?

In which of the following pair, both the species are isoelectronic but the first one is large in size than the second?

In which of the following pair, both the species are isoelectronic but the first one is large in size than the second?

Two men with weights in the ratio 4:3 run up a staircase in time in the ratio 12:11. The ratio of power of the first to that of second is

Two men with weights in the ratio 4:3 run up a staircase in time in the ratio 12:11. The ratio of power of the first to that of second is

Two satellites move along a circular orbit in the same direction at a small distance from each other. A container has to be thrown from the first satellite on the second a one. When will the container reach the second satellite earlier, if it is thrown in the direction of motion of the first satellite or in the opposite direction? The velocity of the container is small in comparison to that of the satellite.

Two balls of same mass are dropped from the same height h, on to the floor. The first ball bounces to a height h//4 , after the collision & the second ball to a height h//16 . The impulse applied by the first & second ball on the floor are I_(1) and I_(2) respectively. Then :-

The horizontal distance between two towers is 140 mdot The angle of elevation of the top of the first tower when seen from the top of the second tower is 30^0dot If the height of the second tower is 60 m , find the height of the first tower.

If two charged particles of same mass and charge are describing circles in the same magnetic field with radii r_(1) and r_(2)(gt r_(1)) the speed of the first particle is … that of the second particle while the time period of the particle is …that of the second partilcle.