SSC (Marathi Semi-English) १० वीं कक्षा - Maharashtra State Board Important Questions for Science and Technology 2

What is recycling of waste?

Name the following: Main ore of aluminium.

What is an alloy?

Give two examples of alloys with their chemical composition.

In the extraction of aluminium: Name the process of concentration of bauxite.

Answer the following question.

What are alloys?

Write a balanced chemical equation for the action of heat on aluminium hydroxide.

In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.

In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.

Differentiate between Toilet soap and Laundry soap.

‘A’ is an element having four electrons in its outermost orbit. An allotropes ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So:
i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?

Choose the correct alternative and rewrite the following: 

Acetic acid ..................

Mammals : _________ : : Amphibia : Fishes

State the connecting links between Peripatus with Annelida and Arthopoda.

Give two examples of vestigial organs  in human beings and plants.

Human tailbone is a vestigial organ. Explain.

Which of the following is the first example of class Homo sapiens?

What do we call the degenerated or partially developed useless organs in living organisms? Enlist such organs in human body? How the same organs are useful in other animals?

Vestigial organ ______ present in human body is proof of evolution.

Write short notes based upon the information known to you.

Darwin’s theory of natural selection