Electric Charge And Electric Current

Samacheer Book Back Questions And Answers For Science Standard 9 “Electric Charge And Electric Current“

I. Choose the correct answer:
1. In current electricity, a positive charge refers to,
(a) presence of electron
(b) presence of proton
(c) absence of electron
(d) absence of proton

2. Rubbing of comb with hair
(a) creates electric charge
(b) transfers electric charge
(c) either (a) or (b)
(d) neither (a) nor (b)

3. Electric field lines _____ from positive charge and _____ in negative charge.
(a) start; start
(b) start; end
(c) start: end
(d) end; end

4. Potential near a charge is the measure of its _____ to bring a positive charge at that point.
(a) force
(b) ability
(c) tendency
(d) work

5. Heating effect of current is called,
(a) Joule heating
(b) Coulomb heating
(c) Voltage heating
(d) Ampere heating

6. In an electrolyte the current is due to the flow of
(a) electrons
(b) positive ions
(c) both (a) and (b)
(d) neither (a) nor (b)

7. Electroplating is an example for
(a) heating effect
(b) chemical effect
(c) flowing effect
(d) magnetic effect

8. Resistance of a wire depends on,
(a) temperature
(b) geometry
(c) nature of material
(d) all the above

II. Match the following:
1. Electric Charge             A. ohm
2. Potential difference      B. ampere
3. Electric field                  C. coulomb
4. Resistance                    D. newton per coulomb
5. Electric current             E. volt

Answers:
1. C
2. E
3. D
4. A
5. B

III. State whether true or false. If false, correct the statement:
1. Electrically neutral means it is either zero or equal positive and negative charges.
2. Ammeter is connected in parallel in any electric circuit.
3. The anode in electrolyte is negative.
4. Current can produce magnetic field.

Answers:
1. True
2. False (Ammeter is connected in series in any electric circuit)
3. False (The anode in electrolyte is positive)
4. True

IV. Fill in the blanks:
1. Electrons move from _____ potential to _____ potential.
2. The direction opposite to the movement of electron is called _____ current.
3. The e.m.f of a cell is analogues to _____ of a pipe line.
4. The domestic electricity in India is an ac with a frequency of _____ Hz.

Answers:
1. lower, higher
2. conventional
3. water pump
4. 50

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