SSLC (English Medium) कक्षा ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?

If a moving body comes to rest, then its acceleration is ______.

Acceleration is defined as the rate of change of ______.

If a body starts from rest, what can be said about the acceleration of the body?

A car is being driven at a speed of 20ms^-1 when brakes are applied to bring it to rest in 5 s. The deceleration produced in this case will be ______.

The value of acceleration for a body at rest is ______.

Acceleration is a scalar.

An object can be moving with uniform speed but with variable acceleration.

It is possible to have objects moving with uniform speed but variable acceleration.

Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.

Assertion: A negative acceleration of a body can be associated with speeding up of the body.
Reason: Increase in the speed of a moving body is independent of its direction of motion.

Assertion: When a body is subjected to a uniform acceleration, it is always moving in a straight line.
Reason: Motion may be straight-line motion or circular motion.

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.