current objective question for cbse, jee , neet class12 chapter 3
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Dpp current
questions
1. 1. How many electrons per second flow
through the cross sectional of a conductor so that the conductor carries a
current of 1 ampere?
a. 6.00 x 1016/sec b. 6.00 x 1017/sec c. 6.00 x 1019/sec d. 6.25 x 1018/sec.
2. 2. In a discharge tube the number of
hydrogen ions drifting across a cross section per second is 1.0 X 1018,
while the number of electrons drifting in opposite direction across that of cross
section is 2.7 x 1018 per second . calculate the total current crossing
the given cross section .
a. 0.6 A b 0.12 A
c.3 A d. 6 A
3. 3. Current I in a circuit varies with
time t as per relation given below : i= 3k + 2k’t . find constant current which
is would send the charge equivalent to time interval t=0 to t=4s . take
constant k and k’ as unity .
a. 7 A b. 10 A c. 4 A d. 4 A
4. 4. A current of 7.0 A is maintain in a
wire for 40 s .
a. How many charge will flow through wire
?
A 280 C B 270 C C 290 C D 300 C
b. How many electrons flow through the
wire in the given time
a. 1021 b. 1022 c. 1024 d. none of these
5. 5. Calculate the amount of current
flowing through a conductor if 10 6 electrons cross through the cross
section of the conductor in 1.6 millisecond. Given e=1.6*10-19c.
a. 1021 A b 1021 A c 1023 A d
10-10 A
6. 6. Figure shows a plot of current I
through the cross section of a wire over a time interval of 10 s . find the
amount of charge that the wire during this time period.
Comments
2. ( a )
3. 28 C .... ( Not in option )
4. a. ( A )
b. ( D )
5. ( d )
6. Total charge flown = Area under the curve of I-t graph
= Area of triangle + Area of rectangle
= 25/2+25
= 75/2
= 37.5 C
2-{a}
4-A-{a}
B-{d}
5-{d}
6-{75÷2 coulomb}