Physical World — Physics STD 11 Science — Question

Explain why the speed of a whirl wind in a tornado is alarmingly high.

What is the bulk modulus of a perfectly rigid body?

A black metal foil is warmed by radiation from a sphere at temperature T at a distance d. If the power received is P, find the power received when both the temperature and distance are doubled.

Choose the correct alternative: Acceleration due to gravity increases/ decreases with increasing altitude.

A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?

Is the damping force constant on a system executing SHM?

A vessel with adiabatic walls has two chambers. One chamber is filled with gas and the other is a vacuum. The room divider suddenly bursts. What will be the change in the internal energy of the gas in this process?

What would be the effect on rms velocity of gas molecules, if the temperature of the gas is increased by a factor 4?

Read each statement below carefully and state, with reasons and examples, if it is true or false:A scalar quantity is one that
Does not vary from one point to another in space.

How will the time period of a simple pendulum change when its length is doubled?