What approximate value should come in place of the

Which of the following correctly describes the nature of electric field lines? 

What is the name of the process by which a liquid changes into gas at all temperatures?  

Which law explains the relation between pressure and volume of a gas at constant temperature?  

Which physical quantity is conserved in a collision (in the absence of external forces)?  

In an electric motor, energy is transformed from:

Which of the following is an example of a non-renewable source of energy?  

What is the speed of sound in air at room temperature (approx)?  

Which of the following is not a characteristic of simple harmonic motion (SHM)?

A capacitor filled with dielectric constant K is connected to a battery. If dielectric is removed, how much charge flows back?

Two bodies of masses m and 4m are separated by a distance d. Where will the gravitational field be zero along the line joining them?