How will you determine composition of soil ?

What is the composition of soil?

Derive an expression for the torque acting on an electric dipole suspended freely in a uniform electric field. How will you determine the direction of torque?

Explain Biot-Savart law for the magnetic field produced at a point due to the current flowing in a current element. How will you determine the direction of the field?

How will you define fruit?

How will you define the mass?

How will you determine the poles of magnet if you cut the bar magnet into pieces?

Write the full name of SONAR. How will you determine the depth of a sea using echo ranging ?