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## Chapter: 9th Science : Physics : Electric Charge And Electric Current

Science : Physics : Electric Charge And Electric Current : Book Back Important Questions, Answers, Solutions : I. Choose the correct answer, II. Fill in the blanks, III. State whether true or false. If false, correct the statement, IV. Match the following, V. Assertion and reason type questions

### 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

[Answer: (b) or (c) start, 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)

[Answer: (c) both (a) and (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

Answer: 1-c, 2-e, 3-d, 4 -a, 5-b

1. Electric Charge - coulomb

2. Potential difference - volt

3. Electric field - newton per coulomb

4. Resistance - ohm

5. Electric current - ampere

### 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.

Correct statement: Ammeter is connected in series in any electric circuit.

3. The anode in electrolyte is negative.

Correct statement: The anode in electrolyte is positive.

4. Current can produce magnetic field.

### IV. Fill in the blanks :

1. Electrons move from lower potential to higher potential.

2. The direction opposite to the movement of electron is called conventional current.

3. The e.m.f of a cell is analogues to water pump of a pipe line.

4. The domestic electricity in India is an ac with a frequency of 50 Hz.

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