In a hot wire ammeter due to the flowing of the current, the temperature of the wire is increased by $$5^{\circ}$$ C. If the value of the current is doubled, then the increase in temperature will be: 1. $$15^{\circ}$$ C 2. $$20^{\circ}$$ C 3. $$25^{\circ}$$ C 4. $$30^{\circ}$$ C

Subtopic:  Heating Effects of Current |
68%
From NCERT
AIPMT - 1998
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The potentiometer is best for measuring voltage, as:

1. It has a sensitive galvanometer
2. It has wire of high resistance
3. It measures p.d. like in closed circuit
4. It measures p.d. like in open circuit

Subtopic:  Meter Bridge & Potentiometer |
From NCERT
AIPMT - 2000
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When three identical bulbs of $$60$$ watts and $$200$$-volt rating are connected in series to a $$200$$-volt supply, the power drawn by them will be:
1. $$180$$ watts
2. $$10$$ watts
3. $$20$$ watts
4. $$60$$ watts

Subtopic:  Heating Effects of Current |
73%
From NCERT
AIPMT - 2004
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The electric resistance of a particular wire of iron is R. If its length and radius are doubled, then:

 1 The resistance will be halved and the specific resistance will remain unchanged 2 The resistance will be halved and the specific resistance will be doubled 3 The resistance and the specific resistance, will both remain unchanged 4 The resistance will be doubled and the specific resistance will be halved
Subtopic:  Combination of Resistors |
82%
From NCERT
AIPMT - 2004
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Resistances $$n$$, each of $$r$$ ohm, when connected in parallel give an equivalent resistance of $$R$$ ohm. If these resistances were connected in series, the combination would have resistance in ohms, equal to:
1. $$\dfrac{R}{n^2}$$
2. $$\dfrac{R}{n}$$
3. $$nR$$
4. $$n^2R$$

Subtopic:  Combination of Resistors |
79%
From NCERT
AIPMT - 2004
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The current in $$8~\Omega$$ resistance is (in the figure below):

1. $$0.69$$ A
2. $$0.92$$ A
3. $$1.30$$ A
4. $$1.6$$ A

Subtopic:  Kirchoff's Voltage Law |
56%
From NCERT
AIPMT - 1999
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If the power dissipated in $$5~\Omega$$ is $$20$$ W then the power dissipated in $$4~\Omega$$ is:

1. $$4$$ W
2. $$6$$ W
3. $$10$$
4. $$20$$ W

Subtopic:  Heating Effects of Current |
74%
From NCERT
AIPMT - 1999
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The value of $$R$$ for which power in it is maximum is:

1. $$3~\Omega$$
2. $$6~\Omega$$
3. $$12~\Omega$$
4. $$9~\Omega$$

Subtopic:  Heating Effects of Current |
76%
From NCERT
AIPMT - 1999
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The terminal potential difference of a cell is greater than its emf when:

 1 A battery of less emf is connected in its series. 2 A battery of higher emf is connected in its series. 3 A battery of higher emf is connected in its parallel. 4 A battery of less emf is connected in its parallel.
Subtopic:  EMF & Terminal Voltage |
From NCERT
AIPMT - 1999
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In India electricity is supplied for domestic use at $$220$$ V. It is supplied at $$110$$ V in the USA. If the resistance of a $$60$$ W bulb for use in India is $$R$$, the resistance of a $$60$$ W bulb for use in the USA will be:

 1 $$2R$$ 2 $$\dfrac{R}{4}$$ 3 $$\dfrac{R}{2}$$ 4 $$R$$
Subtopic:  Heating Effects of Current |
81%
From NCERT
AIPMT - 2004
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