Gravitation — Physics STD 11 Science — Question

What is the effect of solute on the surface tension of a liquid?

Solar pond is a device for collecting solar heat. The pond is about one metre deep, filled with saturated salt solution and protected from air current and other disturbances. When exposed to sun, the temperature at the bottom can go as high as 80°C or more. Why is this possible?

How many fixed points are taken in absolute (kelvin) scale of temperature and what is their value?

Two artificial satellites, one of mass 400kg and another of mass 2500kg, are set in the same orbit around a planet. What is the ratio of their (i) orbital velocities, (ii) time periods?

It it possible that work can be done by a force even when there is no motion?

Good reflectors are poor emitters of thermal radiation. Explain.

What is the principle of calorimetry?

What is the use of open tube manometer?

By which method does heat transmission take place in solids?

Where does a body weigh more; at the surface of the earth or in a mine?