When three identical bulbs are connected in series, the consumed power is $$10$$ W. If they are now connected in parallel then the consumed power will be:
1. $$30$$ W
2. $$90$$ W
3. $$\frac{10}{3}$$ W
4. $$270$$ W

Subtopic: Â Heating Effects of Current |
Â 67%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Heating Effects of Current |
Â 68%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Heating Effects of Current |
Â 74%
From NCERT
AIPMT - 1999
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Heating Effects of Current |
Â 76%
From NCERT
AIPMT - 1999
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If there are two bulbs of ($$40~\text{W},200~\text{V}$$), and ($$100~\text{W},200~\text{V}$$), then the correct relation for their resistance is:
1. $$R_{40}<R_{100}$$
2. $$R_{40}>R_{100}$$
3. $$R_{40}=R_{100}$$
4. no relation can be predicted

Subtopic: Â Heating Effects of Current |
Â 87%
From NCERT
AIPMT - 2000
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Two $$220$$-volts, $$100$$-watts bulbs are connected first in series and then in parallel. Each time the combination is connected to a $$220$$-volts AC supply line. The power drawn by the combination in each case respectively will be:
1. $$50$$ watts, $$100$$ watts

2. $$100$$ watts, $$50$$ watts

3. $$200$$ watts, $$150$$ watts

4. $$50$$ watts, $$200$$ watts

Subtopic: Â Heating Effects of Current |
Â 76%
From NCERT
AIPMT - 2003
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in $$10$$ minutes. When the other coil is used the water boils in $$40$$ minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be:
1. $$8$$ min
2. $$4$$ min
3. $$25$$ min
4. $$15$$ min

Subtopic: Â Heating Effects of Current |
Â 78%
From NCERT
AIPMT - 2003
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A fuse wire is a wire of:

1. high resistance and high melting point

2. high resistance and low melting point

3. low resistance and low melting point

4. low resistance and high melting point

Subtopic: Â Heating Effects of Current |
Â 67%
AIPMT - 2003
Hints

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: Â Heating Effects of Current |
Â 73%
From NCERT
AIPMT - 2004
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Heating Effects of Current |
Â 81%
From NCERT
AIPMT - 2004
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch