SSLC (English Medium) Class 7 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

milli ampere: micro ampere : : 10-3A : ______.

Filling up a balloon with hot air is a _______ change.

Stretching gold coin into a ring is a ______ change.

Match the following

Classify the following changes as physical and chemical changes

A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.

Physical Change: Boiling::Chemical Change: ______.

Wood to sawdust:______:: Wood to Ash: Chemical change

What type of change is colouring of a paper?

What type of energy changes is associated when ice melts?

Distinguish physical and chemical changes.

What is the difference between dissolution of sugar and burning of sugar ?

Higher order Thinking question

Boiling of water is a physical change; but boiling of egg is a chemical change. Why?

Assertion: The explosion of fire cracker is a physical change.

Reason: A physical change is a reversible change.

Assertion: Burning of wood log to charcoal is a physical change.

Reason: The products formed of burning a piece of wood can be easily converted back to wood log.

True or False – If false give the correct answer

Human stomach is an organ.

Bacteria: microorganism:: mango tree: ______.

Teacher said “A virus is not an organism” Do you agree with this statement or not? Explain Why?

Write correct sequence from cell to organism?

The following characteristics are essential for classification.

The largest division of the living world is ______.