Test on Current Electricity IIT/NEET Level

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All Questions carry Equal Marks.Choose The Correct Option From the given otions. 

Full Marks :10x4=40;negative marking for wrong answer .

Working Of each solution is mandatory .Please sit with pen and paper and no calculators are allowed .

Question 1)

Fig. represents a balanced Wheatstone's Bridge. The value of resistance R will be–

A)

25 Ω

B)

30 Ω

C)

100 Ω

D)

200 Ω 

Question 2)

The resultant resistance between the points A and B in the following diagram Fig. will be –

A)

4Ω

B)

8Ω

C)

6Ω

D)

2Ω

Question 3)

In the following fig. the ratio of current in 3Ω and 1Ω resistances is–

A)

1/3

B)

2/3

C)

1

D)

2


Question 4)

The equivalent resistance between A and B is–

A)

2R/3

B)

R/3

C)

R

D)

3R



Question 5)

A cylindrical wire is stretched to increase its length by 10%. The percentage increase in the resistance of the wire will be–

A)

20%

B)

21%

C)

22%

D)

24%

Question 6)

A deniel cell is balanced on 125 cm length of a potentiometer wire. When the cell is short circuited with a 2Ω resistance the balancing length obtained is 100 cm. Internal resistance of the cell will be

A)

1.5Ω

B)

0.5Ω

C)

1.25Ω

D)

4/5Ω

Question 7)

A battery with negligible internal resistance is connected with 10m long wire. A standard cell gets balanced on 600 cm length of this wire. On increasing the length of potentiometer wire by 2m then the null point will be displaced by

A)

200 cm

B)

120 cm

C)

720 cm

D)

600 cm

Question 8)

A galvanometer, having a resistance of 50Ω gives a full scale deflection for a current of 0.05 A. the length in meter of a resistance wire of area of cross-section 2.97 × 10–2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current is : (Specific resistance of the wire = 5 × 10–7 Ωm)

A)

9

B)

6

C)

3

D)

1.5

Question 9)

The scale of a galvanometer of resistance 100Ω contains 25 divisions. It gives a deflection of one division on passing a current of 4 × 10–4 A. The resistance in ohms to be added to it, so that it may become a voltmeter of range 2.5 volt is

A)

100

B)

150

C)

250

D)

300

Question 10)

Determine the current in the following circuit

A)

1 A

B)

2.5 A

C)

0.4 A

D)

3 A