Thermionic Emission and Radioactivity — Physics STD 10 — Question

Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality? Give a reason for your answer.

Define the term power. State its S.I. unit.

A physical balance has its arms of length 60 cm and 40 cm. What weight kept on pan of the longer arm will balance an object of weight 100 gf kept on other pan?

What is the purpose of a jack in lifting a car by it?

What kind of energy is possessed in a situation when?
A fish moving in the water.

What do you understand by mechanical energy?

State two ways of increasing the frequency of vibrations of a stretched string.

What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?

At which point is the centre of gravity situated in a triangular lamina.