Physics Test - ...

If a satellite is orbiting the earth very close to its surface, then the orbital velocity mainly depends on

A force of 750 N is applied to a block of mass 102 kg to prevent it form sliding on a plane with an inclination angle 30° with the horizontal. If the coefficients of static friction and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the frictional force acting on the block is

In thermal equilibrium, the average velocity of gas molecules is

A body, whose momentum is constant, must have constant

On increasing the temperature of a substance gradually, which of the following colours will be noticed by you

A straight conductor carrying current I. If the magnetic field at a distance r is 0.4 tesla, then magnetic field at a distance 2r will be

A river water is flowing at 5ms −1. The depth of river water is 10m. The shearing stress between horizontal layers of the river water is (Viscosity of water is 1 decapoise)

A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. If the magnet is rotated by 90° in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth's magnetic field = B H)

A stone is dropped into a lake from a tower of 500 m height. The sound of splash will be heard after (Take g = 10 m-s^⁻2)

Which of the following statement is false?