Units and Measurements — Physics STD 11 Science — Question

Is the phenomenon of beats observable in case of two light waves of nearly equal frequencies?

Is work done by a non conservative force always negative? Comment.

If the number of gas molecules is doubled, what will be the effect on the value of pressure and kinetic energy?

What is the specific heat capacity of a gas in isothermal process?

Express the power of a 100 watt bulb in CGS unit.

If the sum of all the forces acting on a body is zero, is it necessarily in equilibrium? If the sum of all the forces on a particle is zero, is it necessarily in equilibrium?

A satellite revolves round the earth. Air pressure inside the satellite is maintained at 76cm of mercury. What will be the height of mercury column in a barometer tube 1m long placed in the satellite?

When several passengers are standing in a moving bus, it is said to be dangerous. How will you justify this statement?

Why does a hot liquid move faster than cold liquid?

Explain why :
heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water.