SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

The amplitude of the sound wave decides its

Sound travels in the form of ______.

High-frequency sounds that cannot be heard by you are called _______.

Match the following.

Consider the statement given below and choose the correct option.

Assertion: When lightning strikes, the sound is heard a little after the flash is seen.

Reason: The velocity of light is greater than that of the sound.

Give an example to show that light travels faster than sound?

A sound wave travels 2000 m in 8 s. What is the velocity of the sound?

The property which allows the metals to be hammered into their sheets is ______.

Name the metals that are used in jewellery.

Why wires cannot be drawn from materials such as stone or wood?

Burning of paper is a ______ change.

Limestone contains ______ mainly.

Photosynthesis is a chemical reaction that takes place in the presence of ______.

_____ is the basic material to manufacture urea.

________ is a chemical substance which alters the speed of a chemical reaction.

Mention the various conditions required for a chemical reaction to occur.

What is the role of a catalyst in a chemical reaction?

Discuss how acid rain occurs due to emission of smoke from vehicles and industries?

The process of conversion of iron into hydrated form of oxides is called _______.

What is global warming?