Current Electricity Exe-9A Very Short Answer Physics Class-9 ICSE Selina Publishers. There is the solutions of Very short Answer type Questions of your latest textbook which is applicable in 2024-25 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9 current electricity class 9 questions and answers pdf .
Current Electricity Exe-9A Very Short Answer Type
Physics Class-9 ICSE Selina Publishers
| Board | ICSE |
| Class | 9 |
| Subject | Physics |
| Writer / Publication | Concise selina Publishers |
| Chapter-9 | Current Electricity |
| Exe-9A | Electric Current |
| Topics | Solution of Exe-9(A) Very Short Answer Type |
| Academic Session | 2024-2025 |
Exercise- 9A Electric Current
Current Electricity Very Short Answer Physics Class-9 ICSE Selina Publishers
Page – 215
VERY SHORT ANSWER TYPE:
Question-1 Name one d.c. source and one a.c. source.
Answer-1 d.c. source: cell, a.c. source: mains.
Question-2 What is an electric cell?
Answer-2 electric cell is a device used to generate electricity, or to make chemical reactions by applying electricity. It converts chemical energy into electrical energy.
Question-3 What transformation of energy takes place when current is drawn from a cell?
Answer-3 Chemical energy changes to electrical energy.
Question-4 Name the constituents of a cell.
Answer-4 Two electrodes and an electrolyte in a vessel.
Question-5 State the two kinds of cell. Give one example of each.
Answer-5 Two kinds of cells are:
1 => Primary cell : Leclanche cell.
2 =>Secondary cell : Lead (or acid) accumulator.
Question-6 How much is the charge on an electron ?
Answer-6 -1.6 x (10)^-19 coulomb.
Question-7 n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, write an expression for the current in the conductor.
Answer-7 The expression for the current in the conductor is (ne/t) as current = charge/ time = (ne/t)
Question-8 Name the instrument used to control current in an electric circuit.
Answer-8 Rheostat is the instrument used to control current in an electric circuit.
Question-9 What is the function of a key (or switch) in an electric circuit?
Answer-9 To put on or off current in a circuit.
Question-10 Select conductors of electricity from the following: Copper wire, silk thread, pure water, acidulated water, human body, glass, mercury.
Answer-10 Copper wire , acidulated water, human body and mercury.
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