One Mark Questions Answers

ELECTRIC CHARGE AND ELECTRIC CURRENT

TEXT BOOK EXERCISES

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

[Answer: (c) absence of electron]

2. Rubbing of comb with hair

(a) creates electric charge

(b) transfers electric charge

(c) either (a) or (b)

(d) neither (a) nor (b)

[Answer: (b) transfers electric charge]

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

[Answer: (d) work]

5. Heating effect of current is called,

(a) Joule heating

(b) Coulomb heating

(c) Voltage heating

(d) Ampere heating

[Answer: (a) Joule 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

[Answer: (b) chemical effect]

8. Resistance of a wire depends on,

(a) temperature

(b) geometry

(c) nature of material

(d) all the above

[Answer: (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.

Answer: True.

2. Ammeter is connected in parallel in any electric circuit.

Answer: False.

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

3. The anode in electrolyte is negative.

Answer: False.

Correct statement: The anode in electrolyte is positive.

4. Current can produce magnetic field.

Answer: True.

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.