Thermionic Emission and Radioactivity — Physics STD 10 — Question

Name two instruments of the total refracting prism in which is used.

Name the subjective property of light related to its wavelength.

In which of the following case does the electromagnetic induction occur?

A current is started in a wire held near a loop of wire ?

Name the subjective property of sound related to its frequency.

What do you mean by a rheostat?

State condition when magnitude of force on a current carrying conductor placed in a magnetic field is maximum ?

We can burn a piece of paper by focussing the sun rays by using a particular type of lens. Name the type of lens used for the above purpose.

Compare the penetrating powers of α, β and γ-radiations.

A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?

An object is placed in front of a convex lens such that the image formed has the same size as that of the object. Draw a ray diagram to illustrate this.