In the circuit shown in figure find the value of r(internal resistance of the cell) for which power transferred by the cell is maximum

                                   

1.  4Ω  

2.  12Ω  

3.  16Ω 

4.   8Ω

Subtopic:  Combination of Resistors |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


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

Difficulty Level:


If a resistance coil is made by joining in parallel two resistances each of 20Ω. 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 |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


Two battries of emf ε1, ε2 and internal resistance r1, r2 are connected in parallel as shown in figure. The effective emf of the circuit across A and B is

1.  ε1r1 + ε2r2r1 + r2  

2.  ε1r2 + ε2r1r1 + r2  

3.  ε1r2 + ε2r1r1 × r2  

4.  ε1r1 + ε2r2r1 - r2

Subtopic:  Grouping of Cells |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


Which of the following graphs correctly represents the variation of mobility μ of electrons with applied electric field (E) in a metallic conductor?

1.  

2.  

3.  

4.  

Subtopic:  Current & Current Density |
To view explanation, please enrol in the course below.
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 |
To view explanation, please enrol in the course below.
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 |
To view explanation, please enrol in the course below.
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.  104 m/s  

2.  108 m/s 

3.  100m/s 

4.  10-4m/s

Subtopic:  Current & Current Density |
To view explanation, please enrol in the course below.
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.  2Ω

2.  4Ω

3.  6Ω

4.  8Ω

Subtopic:  Combination of Resistors |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


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

                       

1.  3Ω

2.  4Ω

3.  5Ω

4.  6Ω

Subtopic:  Kirchoff's Voltage Law |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level: