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

The movement of the positive charge is called ______.

What do you know about Michael Faraday?

Assertion (A): A magnetic field exerts a force on a moving charge in the same direction as the direction of the field itself.
Reason (R): The direction of force is given by Fleming’s left-hand rule.

A current-carrying conductor of a certain length, kept perpendicular to the magnetic field experiences a force F. What will be the force if the current is increased four times, the length is halved and the magnetic field is tripled?

A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?

For a spherical mirror, ______ is true.

A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.

The image formed in a plane mirror is always inverted.

The minimum length of the mirror required to see the full image of the person is half ‘ of his height.

The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.

Explain why a ray of light passing through the center of curvature of a concave mirror, gets reflected along with the same pattern.

How tall does a mirror have to be to fit an entire person’s body?

What is the focal length (f) of a mirror?

Define the radius of curvature.

What is “aperture”?

______ is a general term for the distinguishable characteristic of a wave.

What is acoustics?

What is a star? What is its composition and how was it formed?

How is the pole star distinguished from other stars? Explain.

Stars are built by ____ gases.