Q-I) Fill in the blanks :
1. pH scale ranges from _______to_________.
2. The pH of an acidic solution is ________ than 7.
3. The mixture of several indicator is known as ___________ indicator.
4. Atomic radius is expressed in _____________.
5. The unit of atomic radius id called ____________.
6. Positively charged ions are called ______________.
7. The sum of the number of ___________ and _________ in the nucleus of the atom is called the atomic mass number.
8. A current flows through a circuit due to the difference in _________ between two points in the conductor.
9. Electrons flow from _________ terminal to _________ terminal in a conductor when potential difference is applied.
10. Energy can neither be ___________ nor __________.
11. Flowing water has __________ energy.
12. The energy stored in dry cell is in the form of ___________.
13. Kinetic Energy of a body is ___________.
14. ___________ is the capacity to do work.
15. The electronic configuration of an element is ( 2,4). Hence its valency is ________.
16. S.I. unit of work is ___________.
17. S.I. unit of speed is _______ and in C.G.S. unit it is ___________.
Answers
Answer:
Acidic substances have pH values ranging from 1 to 7 and alkaline or basic substances have pH values ranging from 7 to 14.
Answer:
1. pH scale ranges from 0 to 14.
2. The pH of an acidic solution is less than 7.
3. The mixture of several indicators is known as a universal indicator.
4. Atomic radius is expressed in nanometers.
5. The unit of the atomic radius is called nm.
6. Positively charged ions are called cations.
7. The sum of the number of protons and neutrons in the nucleus of the atom is called the atomic mass number.
8. A current flows through a circuit due to the difference in potential between two points in the conductor.
9. Electrons flow from the negative terminal to the positive terminal in a conductor when potential difference is applied.
10. Energy can neither be created nor be destroyed.
11. Flowing water has kinetic energy.
12. The energy stored in dry cells is in the form of chemical energy.
13. Kinetic Energy of a body is the energy that it possesses due to its motion.
14. Energy is the capacity to do work.
15. The electronic configuration of an element is ( 2,4). Hence its valency is 4.
16. S.I. unit of work is J [Joule].
17. S.I. unit of speed is m/s [meter per second] and in the C.G.S. unit, it is cm/s [centimetre per second].
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