Current Electricity Test

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Current Electricity Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

A student has 15 resistors of resistance ‘r’. The minimum resistance made by him from given resistors is

A
10r

B
r/15

C
15/r

D
r/50

Solution

To obtain minimum resistance, all resistors must be connected in parallel. Hence equivalent resistance of combination = r/15
Question 2
1 / -0

Kirchhoff's first and second laws of electrical circuits are consequences of

A
conservation of energy and electric charge respectively

B
conservation of energy

C
conservation of electric charge and energy

D
conservation of electric charge

Solution

(c) conservation of electric charge and energy respectively

Kirchhoff s first law of electrical circuit is based on conservation of charge and Kirchhoff's second law of electrical circuit is based on conservation of energy.
Question 3
1 / -0

p identical cells each of e.m.f. y and internal resistance c are connected in series. An external resistance R is connected in series to this combination. The current through R is

A
py/R+nr

B
nE/nR+r

C
py/R+nc

D
pE/R+r

Solution

Total e.m.f. = py, Total resistance= R + nc

i = py/R+nc
Question 4
1 / -0

The alloys constantan and manganin are used to make standard resistance because they have

A
Low resistivity

B
High resistivity

C
Low temperature coefficient of resistance

D
Both b and c
Solution
- Because it has very low-temperature coefficient. Alloys like constantan and manganin are used to make standard resistance coils because.
- They have a very small temperature coefficient of resistivity. Thus, their value of resistivity does not change even for very high values of temperature.
Question 5
1 / -0

The resistance of discharge tube is

A
Ohmic

B
Non-ohmic

C
Both a and b

D
Zero

Solution

This is because of secondary ionisation which is possible due to the gas-filled in it.
Question 6
1 / -0

If an electric current is passed through a nerve of a man then man

A
Begins to laugh

B
Begins to weep

C
Is excited

D
Becomes insensitive to pain
Solution
- If an electric current is passed through a nerve, the man will become insensitive to pain. The nerves will be numb and weakened due to the electric force.
- The nerve tissue provides some resistance to the current but not much. This can result in severe damage, amnesia, seizure or even a respiratory problem.
Question 7
1 / -0

A storage cell is charged by 5 amp D.C for 18 hours. Its strength after charging is

A
18 AH

B
5 AH

C
90 AH

D
15 AH

Solution

Given I = 5 amp

Time = 18 Hours

Since,

Strength = 5 x 18 = 90AH

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Current Electricity Test - 20

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Current Electricity Test - 20

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Question 1

10r

r/15

15/r

r/50

Solution

Question 2

conservation of energy and electric charge respectively

conservation of energy

conservation of electric charge and energy

conservation of electric charge

Solution

Question 3

py/R+nr

nE/nR+r

py/R+nc

pE/R+r

Solution

Question 4

Low resistivity

High resistivity

Low temperature coefficient of resistance

Both b and c

Solution

Question 5

Ohmic

Non-ohmic

Both a and b

Zero

Solution

Question 6

Begins to laugh

Begins to weep

Is excited

Becomes insensitive to pain

Solution

Question 7

18 AH

5 AH

90 AH

15 AH

Solution

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