Force, Work, Power and Energy — Physics STD 10 — Question

When a body moves in a circular path, how much work is done by the body? Give reason.

A pair of scissors and a pair of pliers both belongs to the same class of levers. Name the class of lever. Which one has the mechanical advantage less than 1?

How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?

Find the energy released by a current of 0.25 amperes flowing through a heater for 5 minutes. The p.d. is 230 V.

What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.

State a law, which determines the direction of magnetic field around a current carrying wire.

Draw a diagram to show the refraction of a monochromatic light ray through an equilateral prism. On the diagram, label the incident, refracted, and emergent rays. It also indicates the angle of deviation by the letter δ.

The power of a lens is +2.0 D. Find its focal length and state what kind of lens it is.

An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.

A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?