Sound — Physics STD 10 — Question

How is the magnetic field due to a straight current carrying wire affected if current in wire is decreased ?

Two forces each of magnitude 2 N act vertically upward and downward respectively on two ends of a uniform rod of length 1 m, freely pivoted at its centre. Determine the resultant moment of forces about the mid-point of the rod.

Give two properties of ultraviolet radiations which differ from the visible light.

State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.

Name the unit which a consumer pays as the cost of electricity.

Name the scientist who discovered Microwaves

What material is used for making wire to prepare heating coils? Give a reason.

What is an ideal machine?

Why is a loud sound heard at resonance?

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