Sunday , March 24 2019
Home / Science (page 18)

Science

NCERT 7th Class (CBSE) Science: Acids, Bases and Salts

NCERT 7th Class (CBSE) Science: Acids, Bases and Salts

Question: Acids are not stored in metal containers. Why? Answer: Acids can corrode metals like aluminium and iron due to their corrosive nature. That is why acids are stored in glass containers and not in metal containers. Question: Why do different substances have different tastes? Answer: Different substances have different tastes …

Read More »

NCERT 7th Class (CBSE) Science: Acids, Bases and Salts – Quiz

NCERT 7th Class (CBSE) Science: Acids, Bases and Salts

NCERT 7th Class (CBSE) Science: Acids, Bases and Salts – Quiz 31 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Acids, Bases and Salts – Quiz: Acids: Substances that taste sour. Organic Acid: Acids that are naturally obtained from plant and animal sources. Mineral Acid: Acids that are derived from …

Read More »

NCERT 7th Class (CBSE) Science: Heat and Temperature – Quiz

NCERT 7th Class (CBSE) Science: Heat and Temperature

NCERT 7th Class (CBSE) Science: Heat and Temperature – Quiz 30 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Heat and Temperature – Quiz: Heat: A form of energy that flows from hot object to a cold object. Temperature: The degree of hotness or coldness of an object. Conduction: The transfer …

Read More »

NCERT 7th Class (CBSE) Science: Heat and Temperature

NCERT 7th Class (CBSE) Science: Heat and Temperature

Question: What is heat? Answer: Heat is a form of energy, entry or exit of which correspondingly increases or decreases internal energy of a body when no work is done on the body or by the body. Question: What is temperature? Answer: The degree of hotness and coldness of a body is called temperature of body. Thermometer …

Read More »

NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes – Quiz

NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes

NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes – Quiz 28 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes – Quiz: Physical Change: A physical change is a change in which no new substance is formed. Chemical Change: Those changes in which new substances are …

Read More »

NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes

NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes

Question: Define the following: Valency, Atomicity, Chemical Equation, Rusting, Galvanization, Crystallization. Answer: Definitions are as follows: Valency: The combining capacity of atoms of an element with the atoms of other elements is known as valency. Atomicity: The number of atoms that make up a molecule of an element is known …

Read More »