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

The process of affecting the natural composition and the quality of food substance is known as ______.

Poliomyelitis virus enters the body through ______.

Least count of a vernier caliper is ______ cm.

An instrument that is used to measure the diameter of a cricket ball is ______.

The precision of vernier calipers is ______ mm.

A vernier caliper using the scale invented by Galileo.

How will you find the Zero Error of Vernier Caliper? Explain.

Most buoyant objects are those with relatively ______.

1. high volume
2. higher mass
3. low density
4. less viscosity

The upward force that is caused due to the pressure difference in liquid (or fluid) is called ______.

Icebergs and ships stay afloat due to ______.

The point at which the force of buoyancy is supposed to act is known as ______.

The center of gravity of the floating body and the center of buoyance are in the same ______ line.

In a fluid, buoyant force exists because the pressure at the ______ of an object is greater than the pressure at the top.

If the buoyant force is less, the object will float.

Salt water provides less buoyant force than freshwater.

What do you understand by the term “Buoyancy”.

Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.

Define a Transformer.

The primary coil of a transformer has 800 turns and the secondary coil has 8 turns. It is connected to a 220 V ac supply. What will be the output voltage?

Explain the factors, which will affect the rate of evaporation, taking examples from our daily life experiences.