SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Write the properties of magnetic lines of force.

Magnetic field lines determine ______.

A magnetic needle is kept in a non-uniform magnetic field. It experiences ______.

The relation between weber and Tesla is ______.

Magnetic lines of force never ______ each other.

______ is the number of magnetic field lines passing through a given area.

The direction of the magnetic lines around a current-carrying conductor can be easily understood using the ______ rule.

The magnetic field lines are stronger near the ______ and it diminishes as you go away from it.

A charge moving in a magnetic field, in a direction other than the direction of the magnetic field, experiences a force. It is called the ______ force.

When the conductor is perpendicular to the magnetic field, the force will be the ______, When it is parallel to the magnetic field, the force will be ______. 

Define magnetic field lines of force.

Can two magnetic lines of force intersect? Justify your answer:

A wire 10 cm long carrying a current of 1.5 A is held in a uniform magneÑic field in which B = 10^-3 T. Calculate the force on the wire if it is held perpendicular to the lines of the magnetic field.

What is a lateral inversion in a plane mirror?

The universe began with the start of a massive explosion called ______.

Scientists believe that there are ______ galaxies in the observable universe.

The basic constituent of the universe is luminous matter.

All the matter in the universe is made up of hydrogen and helium.

The important thing about the universe is that it is currently shrinking.

Explain the salient features of the Big Bang Theory.