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

Induced current flows through a coil ______.

Which of the following instruments works by electromagnetic induction?

For making a strong electromagnet the material of the core should be ______.

A galvanometer is an instrument that can detect the presence of a current in a circuit.

A 0.4 m wire, stretched horizontally, carries an electric current of 15 A, in a magnetic field whose magnetic field intensity is 0.1 N/Am. What is the magnitude of the wire?

A conductor of length 50 cm carrying a current of 5 A is placed perpendicular to a magnetic field of induction 2×10 ^-3T. Find the force on the conductor.

In torches, searchlights, and headlights of vehicles, the bulb is placed ______ of the concave mirror.

The image formed by a concave mirror is real, inverted and of the same size as that of the object, the position of the object should be ______.

The focal length of a concave mirror is 5cm. Its radius of curvature is ______.

What is a concave and convex mirror?

Define principal focus of the concave mirror.

Write the uses of the concave mirror.

Between which two points of a concave mirror should an object be placed to obtain a magnification of -2?

To obtain an image twice the size of the object, between which two points related to a concave mirror should an object be placed?

Which among the following statements is correct?

1. Meteors are attracted by the gravitational the force of earth.
2. Meteors are traveling at low speeds.
3. Most of the Meteors are burnt by the heat generated by friction in the atmosphere.

The biggest asteroid is ______.

Comets revolve around the Sun in highly spiral orbits.

Assertion: The outer planets are called Terrestrial Planets.
Reason: Outer planets are made up of hydrogen, helium, and other gases in huge amounts and have very dense atmospheres.

Write short notes on Asteroids.

Differentiate Meteors and Meteorites?