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

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.

How is Sun formed according to the Big Bang theory?

Elements contain the ______of the same kind.

How are elements classified?

Give the chemical formula for cane sugar.

Name the element which is used in toothpaste to strengthen our teeth.

Niels Bohr was Born on ______.

What are the Limitations of Bohr’s Model?

What is isomerism? Explain with an example.