Numerical Problems of Current Electricity - Unit-2 Class - 12th Previous Exam Questions

 Numerical Problems of Current Electricity - Unit-2 Class - 12th Previous Exam Questions

Q.1 Current of 4.8 amperes is flowing through a conductor. The number of electrons per second will be 

(a) 3 × 1019           (b) 7.68 × 1021           (c) 7.68 × 1020         (d) 3 × 1020  

Q.2 Which one is not the correct statement  

(a) 1 volt × 1 coulomb = 1 joule   

(b) 1 volt × 1 ampere  = 1 joule / second 

(c) 1 volt × 1 watt = 1 H.P. 

(d) watt-hour can be expressed in eV 

Q.3 If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be  

(a) 0.2 %               (b) 2 %                    (c) 1 %                (d) 0.1 %

Q.4 The specific resistance of manganin is 50 × 10-8 ohm × m. The resistance of a cube of length 50 cm will be 

 (a) 10-6 ohm        (b) 2.5 × 10-6 ohm     (c) 10-6 ohm       (d) 5 × 10-4 ohm

Q.5 When the length and area of cross-section both are doubled, then its resistance 

(a) Will become half                         (b) Will be doubled 

(c) Will remain the same                   (d) Will become four times 

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