What keeps the particles of matter together?

Sometime, a crackling sound is heard while taking off sweater during winters. Explain. [2 MARKS]

When electric current is passed through a bulb, the bulb gives light because of

The relationship between the focal length f and radius of curvature R for a spherical mirror is:

While standing inside the water up to the waist height, it is very difficult to keep our feet under control. Why?

Discribe how lightning occurs?

In the figure given below, who is pulling whom?

What are the Effects of Force ?

Name the force which helps things to move and stop.

What is 2F called in simple words?

For the given diagram, which factor can be explained in a better way?

To obtain a real, inverted and highly enlarged image, choose the suitable type of mirror and the position of object in front of it.

3 Resistors one of them having a resistance of 12Ω when connected in parallel together across a battery of 44v draws a current of 22A these resistors when connected in series across the same battery draws a current of 2A. Find the resistance value of the other 2 resistors?

Which mirror which always forms a virtual image?

Derive the minimum distance of the obstacle from the source in order to hear a distinct echo. [3 MARKS]