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

Assertion: Position-time graph of a stationary object is a straight line parallel to the time axis. 
Reason: For a stationary object, the position does not change with time.

What is the difference between uniform acceleration and non–uniform acceleration?

When a body is said to be in

1. uniform acceleration
2. non–uniform acceleration?

Match the following:

What are Force multipliers?

Write a short note on the different electrical circuits.

Overloading of electric circuits can lead to short-circuiting.

Name the device which is used to measure the strength of the electric current in an electric circuit.

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.