If the voltage across a bulb decreases by 1%, then the percentage change in its power output is :

(1) 1%

(2) 4%

(3) 2%

(4).5%

Subtopic:  Heating Effects of Current |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

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If a resistance coil is made by joining in parallel two resistances each of 20$\Omega$. An emf of 2V is applied across this coil for 100 seconds. The heat produced in the coil is

(1) 20 J

(2) 10 J

(3) 40 J

(4) 80 J

Subtopic:  Heating Effects of Current |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

1.

2.

3.

4.

Subtopic:  Grouping of Cells |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

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Which of the following graphs correctly represents the variation of mobility $\left(\mathrm{\mu }\right)$ of electrons with applied electric field (E) in a metallic conductor?

1.

2.

3.

4.

Subtopic:  Current & Current Density |
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NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

The equivalent resistance across AB is :

1.  2R

2.  R/2

3.  4R/3

4.  3R/2

Subtopic:  Combination of Resistors |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

The equivalent resistance between points A and B in the circuit shown in the figure is

1.  6R

2.  4R

3.  2R

4.  R

Subtopic:  Combination of Resistors |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

The drift velocity of the electrons in a current-carrying  metallic conductor is of the order of

1.

2.

3.

4.  ${10}^{-4}\mathrm{m}/\mathrm{s}$

Subtopic:  Current & Current Density |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

In the circuit shown in the figure, the effective resistance between A and B is

1.  2$\mathrm{\Omega }$

2.  4$\mathrm{\Omega }$

3.  6$\mathrm{\Omega }$

4.  8$\mathrm{\Omega }$

Subtopic:  Combination of Resistors |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

For the circuit shown in the figure, the value of R must be

1.  3$\mathrm{\Omega }$

2.  4$\mathrm{\Omega }$

3.  5$\mathrm{\Omega }$

4.  6$\mathrm{\Omega }$

Subtopic:  Kirchoff's Voltage Law |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

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If I be the current limit of a fuse wire of length l and radius r, then select the appropriate relation

(1)

(2)

(3)

(4)

Subtopic:  Heating Effects of Current |
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NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level: