An ideal ammeter (zero resistance) and an ideal voltmeter (infinite resistance) are connected as shown in Fig. 6.47. The ammeter and the voltmeter readings are :

(1) 6.25 A, 3.75 V

(2) 3.00 A, 5V

(3) 3.00 A, 3.75 V

(4) 6.00 A, 6.25 V

Subtopic:  EMF & Terminal Voltage |
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In the circuit shown in Fig.6.50, an ideal ammeter and an ideal voltmeter are used. When the key is open the voltmeter reads 1.53 V. When the key is closed, the ammeter reads 1.0 A and the voltmeter reads 1.03 V. The resistance R is :

(1) 0.5 Ω

(2) 1.03 Ω

(3) 1.53 Ω

(4) 0.53 Ω

Subtopic:  EMF & Terminal Voltage |
 51%
From NCERT
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Three voltmeters are connected as shown.

A potential difference has been applied between A and B. On closing the switch S, readings of volmeters?

(1) V1 increases

(2) V1 decreases

(3) V2 and V3 both increase

(4) One of V2 and V3 increases and other decreases

 

Subtopic:  EMF & Terminal Voltage |
 55%
From NCERT
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In the circuit in Fig. 7.27, bulb B does not glow although ammeter A indicates that the current is flowing. Why does the bulb not glow?

(1) The bulb is fused.

(2) There is a break in the circuit between bulb and ammeter.

(3) The variable resistor has too large resistance.

(4) There is a break in the circuit between the bulb and the variable resistance.

Subtopic:  Heating Effects of Current |
 55%
From NCERT
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All bulbs in Fig. 7.30 are identical. Which bulb lights more brightly?

(1) 1

(2) 2

(3) 3

(4) 4

Subtopic:  Heating Effects of Current |
 78%
From NCERT
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Which of the two switches S1 and S2 shown in Fig. 7.31 will produce short circuiting?

(1) S1

(2) S2

(3) Both S1 and S2

(4) Neither S1 nor S2

Subtopic:  Heating Effects of Current |
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Three similar light bulbs are connected to a constant voltage dc supply as shown in Fig. 7.32. Each bulb operates at normal brightness and the ammeter (of negligible resistance) registers a steady current. The filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?

  Ammeter reading                      Bulb brightness

a. increases                                     increases

b. increases                                     unchanged

c. unchanged                                   unchanged

d. decreases                                    unchanged

Subtopic:  Heating Effects of Current |
From NCERT
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The circuit shown in Fig. 7.33 contains a battery, a rheostat, and two identical lamps. What will happen to the brightness of the lamps if the resistance of the rheostat is increased?

    Lamp P                Lamp Q

a. Less bright           Brighter

b. Less brighter        Less brighter

c. Brighter                Less brighter

d. No change             Brighter

Subtopic:  Heating Effects of Current |
From NCERT
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Two similar headlight lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament?

(1) 6 Ω

(2) 4 Ω

(3) 3.0 Ω

(4) 1.5 Ω

Subtopic:  Heating Effects of Current |
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From NCERT
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Two electric bulbs, rated for the same voltage, have powers of 200 W and 100 W, respectively. If their resistances are r1 and r2, respectively then :

1. r1=2r2

2. r2=2r1

3. r2=4r1

4. r1=4r2

Subtopic:  Heating Effects of Current |
 87%
From NCERT
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