Sound — Physics STD 10 — Question

What is the work done when no net force is applied on the body?

A beam of blue, green and yellow light passes through the the Earth's atmosphere. Name the colour which is scattered the most

What is the use of a fixed pulley?

The following belong to which class of lever?
A pair of scissors

State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting an the coil is maximum.

What do you mean by conductance of a conductor?

State the couple effect. Give two example of couple action in our daily life.

Define the term energy and state its S.I. unit.

Complete the following sentence:
In a step-up transformer, the number of turns in the primary are …………than the number of turns in the secondary.

Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.