Electrical Power and Household Circuits — Physics STD 10 — Question

Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Transformer______.

The ___________ [amplitude / wavelength / frequency] determines the pitch of a sound wave.

Good conductors have a ___________ [large / less] concentration of electrons, offer ___________ [large / less] resistance.

Actually, mechanical advantage for all practical machines is always ___________ [greater than/less than/equal to] its velocity ratio.

Fill in the following blank using suitable word:
SI unit of specific heat is ..........

Nm is the unit of ________ .

A ___________ [torque/couple/force] is always needed to produce rotation.

A fuse is connected in …… with the ………..wire.

Dynamo is an example of conversion of mechanical kinetic rotational energy to ___________  [sound energy/ heat energy/ electrical energy].

The refractive index of glass with respect to air is 3/2. The refractive index of air with respect to glass will be ________ .