Current Electricity — Physics STD 10 — Question

What is a prism?
With the help of diagram of a prism, indicate its refracting surfaces, refracting edge and base.

The electric bulbs used these days have a coil-coiled filament. State its reason.

You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex lens and a concave lens?

A transformer lowers e.m.f. from 220 V to 15 V. If 400 W power is given in primary, calculate (i) the current in primary coil and (ii) the current in secondary coil.

A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.

Define the following terms with reference to a machine:
(a) Total load (b) Actual mechanical advantage (c) Velocity ratio

Two resistors of resistance 4 Ω and 6 Ω are connected in parallel to a cell to draw 0.5 A current from the cell.

Draw a labeled diagram of the arrangement

Define one horse power.

What are other units of heat? Name and define them.

The temperature of a lead piece of mass 400 g rises from 20°C to 50°C when 1560 J of heat is supplied to it. Calculate: Heat capacity of lead piece.