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Test: Electric Current (NCERT) - NEET MCQ


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5 Questions MCQ Test Physics Class 12 - Test: Electric Current (NCERT)

Test: Electric Current (NCERT) for NEET 2024 is part of Physics Class 12 preparation. The Test: Electric Current (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Electric Current (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electric Current (NCERT) below.
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Test: Electric Current (NCERT) - Question 1

Ten million electrons pass from point P to point Q in one micro second. The current and its direction is

Detailed Solution for Test: Electric Current (NCERT) - Question 1

Here,number of electron,
n = 10000000 = 107
Total charge on ten million electrons is
Q = ne [where e = 1.6 × 10−19C]
=10× 1.6 × 10−19C = 1.6 × 10−12C
Time taken by ten million electrons to pass from point P to point Q is
t = 1μs = 10−6s
The current
I = 
Since the direction of the current is always opposite to the direction of flow of electrons. Therefore due to flow of electrons from point P to point Q the current will flow from point Q to point P.

Test: Electric Current (NCERT) - Question 2

1  ampere current is equivalent to

Detailed Solution for Test: Electric Current (NCERT) - Question 2

Q = It also Q = ne [e = 1.6 × 10−19C]
∴ ne = It or
= 6.25 × 1018 electrons s−1

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Test: Electric Current (NCERT) - Question 3

A current in a wire is given by the equation, I =2t2 − 3t + 1, the charge through cross section of wire in time interval t = 3s to t = 5s is

Detailed Solution for Test: Electric Current (NCERT) - Question 3

As I = dQ/dt ;
dQ − Idt ;
dQ = (2t2 − 3t + 1)dt

Q.= 
= [2/5(125 − 27) − 32(25 − 9) + 2]
= 43.34C

Test: Electric Current (NCERT) - Question 4

The current in a wire varies with time according to the equation I = 4 + 2t, where I is in ampere and t is in second. The quantity of charge which has to be passed through a cross-section of the wire during the time t = 2s to t = 6s is?

Detailed Solution for Test: Electric Current (NCERT) - Question 4

Given:
I = 4 + 2t
Let dq be the charge which passes in a small interval of time dt. Then
dq = Idt
or dq = (4 + 2t) dt
On integrating, we get

= 48 C

Test: Electric Current (NCERT) - Question 5

In an atom electrons revolves around the nucleus along a path of radius 0.72Å making 9.4×1018 revolution per second. The equivalent current is (e = 1.6×10−19C)

Detailed Solution for Test: Electric Current (NCERT) - Question 5

Radius of electron orbit
r = 0.72Å = 0.72 × 10−10m
Frequency of revolution of electron in orbit of given atom
v = 9.4 × 1018 rev/s
(where T is time period of revolution of electron in orbit)
∴ Then equivalent current is
I = e/T = ev = 1.6 × 10−19 × 9.4 × 1018
= 1.504A

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