Current Electricity Test

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Current Electricity Test - 75

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Question 1
1 / -0

In a balanced Wheatstone's network, the resistance in the arms $$Q$$ and $$S$$ are interchanged. As a result of this

A
Network is not balanced

B
Network is still balanced

C
Galvanometer shows zero deflection

D
Galvanometer and the cell must be interchanged to balance

Solution

We know that in In a balanced Wheatstone's network,
$$\dfrac{P}{Q} = \dfrac{R}{S}$$
If $$Q$$ is replaced by $$S$$ then ratio becomes $$\dfrac{P}{S} = \dfrac{R}{Q}$$ which is not equal to the previous ratio. Hence, network is not balanced.
Question 2
1 / -0

What happens to the current in each resistor when resistors of different values in parallel combination are connected to a source of electricity?

A
Values of current and potential difference are different

B
Values of current and potential difference are same

C
Values of current are different but value of potential difference is same

D
Values of current are the same but values of potential difference are different

Solution

In a parallel combination, all the resistors are connected across the same voltage source. Thus, all of them will have the same potential difference.
But since the values of resistors are different, they will draw different current from the source.
Question 3
1 / -0

The material of wire of potentiometer is

A
Copper

B
Steel

C
Mangamint

D
Aluminum

Solution

Magnemite or constant are used for making the potentiometer wire.
Question 4
1 / -0

If you are provided three resistances $$2 \Omega, 3 \Omega$$ and $$6 \Omega$$. How will you connect them so as to obtain the equivalent resistance of $$4\Omega$$

A

B

C

D
None of these
Question 5
1 / -0

Kirchhoffs first and second laws are based on

A
Charge and Energy Conservation Laws

B
Current and Energy Conservation Laws

C
Mass and Charge Conservation Laws

D
None of these

Solution

Kirchhoff's first law is based on law of conservation of charge and second law is based on law of conservation of energy.
Given that voltage is a measurement of energy per unit charge, Kirchhoff's loop rule is based on the law of conservation of energy, which states: the total energy gained per unit charge must equal the amount of energy lost per unit of charge.
Question 6
1 / -0

Potentiometer is a type of instrument by which potential difference can be measured

A
Zero

B
Infinite

C
Uncertain

D
Depends on external resistance

Solution

The potentiometer is a simple device used to measure the electrical potentials (or compare the e.m.f of a cell). One form of potentiometer is a uniform high-resistance wire attached to an insulating support, marked with a linear measuring scale
Effective resistance of potentiometer infinite.
Question 7
1 / -0

In a Wheatstone bridge, the position of battery and galvanometer is interchanged, then the new balanced position will be

A
Unchanged

B
Will changed

C
Can't say anything

D
May change or may not be, it depends upon the resistance of galvanometer and battery

Solution

Unchanged
There will be no effect. The positions of the battery and galvanometer are interchanged, which makes no difference in the voltage difference as the values of resistances and battery remain the same. So the new deflection of galvanometer will be zero.
Question 8
1 / -0

Five resistances of R $$\Omega$$ were taken. First three resistances are connected in parallel combination and rest two are connected in series combination, then the equivalent resistance is :

A
$$\frac{3}{7} R \ \Omega$$

B
$$\frac{7}{3} R \ \Omega$$

C
$$\frac{7}{8} R \ \Omega$$

D
$$\frac{8}{7} R \ \Omega$$

Solution

$$R_{equi} = \frac{R}{3} + R + R = \frac{7R}{3} \ \Omega$$
Question 9
1 / -0

Kirchhoff's first law, i.e., $$\sum I = 0$$ at a junction, deals with the conservation of

A
charge

B
energy

C
momentum

D
mass

Solution

$$Charge$$
Explanation: The principle of conservation of electric charge implies that: at any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node. This is known as Kirchhoff's current law.
Question 10
1 / -0

When the balance point is obtained in the potentiometer, a current is drawn from

A
both the cells and auxiliary battery

B
cell only

C
auxiliary battery only

D
neither cell nor auxiliary battery

Solution

The emf of the battery in the primary circuit is equal to the emf of the experimental cell in the secondary circuit. the potential differences of the wire between the +ve end and jockey becomes equal to the emf of the experimental cell only.