Matter in Our Surroundings — Science STD 9 — Question

Name the physical quantity whose SI unit is ‘hertz’.

What do you understand by the statement "the solubility of copper sulphate in water at 20°C is 20.7g"?

A cell converts one form of energy into another form. Name the two forms.

Name the device which converts electrical energy into mechanical energy.

“The properties of the product are different from those of the constituents”. State whether this statement best describes an element, a compound or a mixture.

Write an expression for the kinetic energy of a body of mass m moving with a velocity v.

What happens when the temperature of a saturated sugar solution is increased?

Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.

Name one solid, one liquid and one gaseous non-metal.

Name the device or machines which convert:
Mechanical energy into electrical energy.