Thermionic Emission and Radioactivity — Physics STD 10 — Question

What is the full form of SONAR?

State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.

A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long.
To which class does it belong ?

What is the rating of fuse used in power circuits, in domestic use?

Give one use of infrared radiations.

Name the physical quantity which equals the product of voltage and current.

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

For which colour of white light, is the refractive index of a transparent medium the least?

What do you mean by wave-velocity?

Give two characteristic of the virtual image formed by a convex lens.