Light — Physics STD 10 — Question

If substances A and B are liquids then which one would be more useful in car radiators?
Given: Specific heat capacity’A’ 3.8 J/g /K. Specific heat capacity ‘B’ 0.4 J/g /K.

A wire, bent into a circle, carries current in an anticlockwise direction. What polarity does this face of the coil exhibit?

Our hands become warm when we rub them against each other. Why?

What changes will take place in the mass number and atomic number of the nucleus Y if it emits gamma radiations?

A radioactive substance is oxidized. What changes would you expect to take place in the nature of radioactivity? Explain your answer.

In the following cases, where must an object be placed in front of a convex lens so that the image formed is inverted and enlarged .

Define specific heat. Is it same as heat capacity?

Water is used as an effective coolant. Give reason.

A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force.
Write the expression for the work done by the force.

Define the term dispersion of light.