Nature of Physical World and Measurement — Physics STD 11 — Question

The velocity of a rain drop attains constant value because of ……..

Pick out the dimensionless quantity …..

If a raindrop with a mass of 0.05 g falls with constant velocity, the retarding force of atmospheric friction is (neglect density of air) …….

Two gases are enclosed in a container at constant temperature. One of the gases, which is diatomic, has relative molecular mass eight times the other, which is monoatomic. The ratio pf the rms speed of the molecules of the monoatomic gas to that of the molecules of the diatomic gas is

If momentum of a body increases by 25% its kinetic energy will increase by

A geostationary satellite orbits around the earth in a circular orbit of radius 3600 km the time period of a satellite orbiting a few hundred kilometers above the earth’s surface (RE = 6400 km) will be approximately be …… hours.

A body of mass 5 kg is initially at rest. By applying a force of 20 N at an angle of 60° with horizontal the body is moved to a distance of 4 m. The kinetic energy acquired by the body is

Two balloons are filled, one with pure He gas and the other with air. If the pressure and temperature in both the balloons are same the number of molecules per unit volume is