Electric Current and Ohm's law Test

Result

Electric Current and Ohm's law Test - 2

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0.25

According to Kirchhoff ’s Loop Rule

A
The absolute sum of changes in potential around any closed loop must be same.

B
The algebraic sum of changes in potential around any closed loop must be negative.

C
The algebraic sum of changes in potential around any closed loop must be positive.

D
The algebraic sum of changes in potential around any closed loop must be zero.

Solution

Kirchhoff ’s loop rule is based on the principle of conservation of energy. The work done in transporting a charge in a closed loop is zero. The algebraic sum ( since potential differences can be both positive and negative) of potential differences around any closed loop is always zero.
Question 2
1 / -0.25

The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance again

A
All the four resistance should be changed

B
Both the resistance R1 and R4 should be changed

C
No resistance needs to be changed

D
Resistance R4 should be changed only

Solution

The balance point of the Wheatstone ’s bridge is determined by the ratio of the resistances. The change in the emf of the external battery will have no effect on the balance point.
Question 3
1 / -0.25

Resistance of a conductor is

A
ratio of voltage to current

B
ratio of current to voltage

C
product of voltage and conductivity

D
product of voltage and current

Solution

According to Ohm ’s law, V = IR. Therefore R= V/I
Question 4
1 / -0.25

Two cells of emf 1.25V , 0.75V and each of internal resistance 1 Ωare connected in parallel. The effective emf will be

A
1 V

B
1.25 V

C
0.5 V

D
0.75 V

Solution

We want the Voltage difference V_AB .
let A and B be open and not connected to any thing.
There is a current that flows from cell of larger emf to the cell of small emf.
Call that current as I Amperes.
1.25 V - 0.75 V - I * R2 - I * R1 = 0
I = 0.5 / (R1+R2)
V_AB = -0.75 - I * R2 = - 0.75 - 0.5 * R2 / (R1+R2)
= - (0.75 R1 + 1.25 R2) / (R1+R2)
= - ().75 * 1 + 1.25 * 1) / (1 + 1) volts
= - 1 volts
Question 5
1 / -0.25

Flow of charges in direction of electrons is called

A
current

B
electronic current

C
conventional current

D
photonic current

Solution

The flow of electrons is termed electronic current. Electrons flow from the negative terminal to the positive.
Question 6
1 / -0.25

In the measurement of resistance by a metre bridge, the current is necessarily reversed through the bridge wire to eliminate

A
Index errors

B
Random errors

C
End errors

D
Error due to thermoelectric effects

Solution

The connecting metal strips include a small resistance in the circuit called the end resistance.On reversing the current, the end resistance tends to get cancelled out.
Question 7
1 / -0.25

If the length of the filament of a heater is reduced by 10% the power of the heater will

A
increase by about 11%

B
increase by about 19%

C
decrease by about 29%

D
Increase by about 9%

Solution

Power P= V² /R
If length reduced 10% then new resistance of filament will be R ′.
R ′=R −10% of R
R ′=0.9R
Now new power of heater is P2
P₂ = V² /R ′= V² /0.9R =1.1P
% increase power=11%
Question 8
1 / -0.25

Resistance of a conductor is

A
ratio of voltage to current

B
ratio of current to voltage

C
product of voltage and conductivity

D
product of voltage and current

Solution

According to Ohm ’s law, V=I R. Therefore R=V/I
Question 9
1 / -0.25

According to Ohm 's law

A
The electric current I flowing through a substance is proportional to the square of voltage V across its ends

B
The electric current I flowing through a substance is proportional to the voltage V across its ends

C
The electrical current (I ) flowing in an circuit is proportional to the voltage (V ) and inversely proportional to the resistance (R)

D
The electric current I flowing through a substance is independent of the voltage V across its ends

Solution

Ohm ’s law states I is proportional to V.This holds good at steady temperatures and for the flow of constant current.
Question 10
1 / -0.25

Potentiometer is

A
basically a pair of uniform wires

B
basically a long piece of uniform wire

C
basically a loop of uniform wire

D
basically a short piece of non-uniform wire

Solution

Potentiometer is a long wire of uniform cross section made of manganin.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Electric Current and Ohm's law Test - 2

Result

Electric Current and Ohm's law Test - 2

Score

-

Rank

-

SHARING IS CARING

Question 1

The absolute sum of changes in potential around any closed loop must be same.

The algebraic sum of changes in potential around any closed loop must be negative.

The algebraic sum of changes in potential around any closed loop must be positive.

The algebraic sum of changes in potential around any closed loop must be zero.

Solution

Question 2

All the four resistance should be changed

Both the resistance R1 and R4 should be changed

No resistance needs to be changed

Resistance R4 should be changed only

Solution

Question 3

ratio of voltage to current

ratio of current to voltage

product of voltage and conductivity

product of voltage and current

Solution

Question 4

1 V

1.25 V

0.5 V

0.75 V

Solution

Question 5

current

electronic current

conventional current

photonic current

Solution

Question 6

Index errors

Random errors

End errors

Error due to thermoelectric effects

Solution

Question 7

increase by about 11%

increase by about 19%

decrease by about 29%

Increase by about 9%

Solution

Question 8

ratio of voltage to current

ratio of current to voltage

product of voltage and conductivity

product of voltage and current

Solution

Question 9

The electric current I flowing through a substance is proportional to the square of voltage V across its ends

The electric current I flowing through a substance is proportional to the voltage V across its ends

The electrical current (I ) flowing in an circuit is proportional to the voltage (V ) and inversely proportional to the resistance (R)

The electric current I flowing through a substance is independent of the voltage V across its ends

Solution

Question 10

basically a pair of uniform wires

basically a long piece of uniform wire

basically a loop of uniform wire

basically a short piece of non-uniform wire

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.