Q.1. A. Give scientific reasons. (any two)
1. A solid matter has the properties of definite shape and volume
2. Atomic mass number is a whole number.
3. Atoms are stable though negatively charged electron are revolving w
B. Answer in short. (any three)
1. Give names of four non-infectious diseases other than given in the lesson
2. A ship dips to a larger depth in fresh water as compared to marine water
3. The volume of a plastic covered sealed box is 350cm' and the box has a
water or sink in water?
Answers
BRAINLEST!!
1)Any matter that is a solid has a definite shape and a definite volume. The molecules in a solid are in fixed positions and are close together. Although the molecules can still vibrate, they cannot move from one part of the solid to another part. As a result, a solid does not easily change its shape or its volume.
________________________________
2)Atomic number and mass number are always whole numbers because they are obtained by counting whole objects (protons, neutrons, and electrons). The sum of the mass number and the atomic number for an atom (A-Z) corresponds to the total number of subatomic particles present in the atom.
________________________________
3)Atoms are stable because the number of electrons is equal to the number of protons. Electrons are negatively charged and protons are positively charged. ... The balance between both negative and positive charges keep the atoms stable
________________________________
B-1)A non-communicable disease (NCD) is a disease that is not transmissible directly from one person to another. NCDs include Parkinson's disease, autoimmune diseases, strokes, most heart diseases, most cancers, diabetes, chronic kidney disease, osteoarthritis, osteoporosis, Alzheimer's disease, cataracts, and others.
________________________________
2)The density of fresh water is less than marine water due to the buoyant force on the ship that floats on marine water and is greater than the fresh water. For this reason, the ship dips to a larger depth in fresh water as compared to marine water.
________________________________
3)Density of sealed box is greater than density of water. Hence, it will sink in wate
_______________________________