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

Assertion: A real image cannot be produced by plane or convex mirror.
Reason: The focal length of a convex mirror is always taken as positive.

What do you observe when an object is placed anywhere between P and infinity in front of a convex mirror?

Why a convex mirror is preferred for rearview mirrors in cars?

Higher-Order Thinking Skills:

A convex mirror is in water. What should be the change in its focal length?

A liquid changes into a gas at a constant temperature known as its ______.

Match the following:

The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.

The first part of the ISS was launched by ______.

Mention the uses of Robotic arms.

Name a suitable method used to separate two immiscible liquids.

Name a method used to separate two miscible liquids.

What is solvent extraction?

Two immiscible liquids are taken in the above funnel for separation.
Which is denser, X or Y? Suggest any one example for X and one for Y. A third liquid Z which is soluble only in Y is added to the mixture, and the contents in the funnel are shaken well. How many layers will you observe now? How will you separate the three liquids? The boiling point of X is 98°C, that of Y is 43°C and that of Z is 75°C.

Which of the following non-metals can form alloys with metals?

The mixture of metal with mercury is called ______.

Elements are placed in periods based on the number of ______ in their atoms.

List the advantages of alloys.

Explain water of crystallization.

The number of water molecules present in one molecule of copper sulphate is ______.

The molecular formula of copper sulphate pentahydrate is ______.