Parallel Combination

Q.

A switch must be connected in the :

(a) live wire

(b) neutral wire

(c) earth wire

(d) either earth or neutral wire.

Q. Electrical appliances in a domestic circuit are connected in parallel.

1. True
2. False

Q.

Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be ___ ohm.

Q. Find the equivalent resistance between points A and B of the network shown below.

1. $6\Omega$
2. $7\Omega$
3. $4\Omega$
4. $10\Omega$

Q.

The switch is connected to the live wire. Give reasons. (2 marks)

Q.

In parallel combination, the total resistance of the circuit becomes ___the individual resistances.

1. either less than or more than

2. equal to

3. more than

4. less than

Q. Three resistors of values 2 Ω, 4 Ω, 6 Ω are connected in parallel. The equivalent resistance of combination of resistors is _____________.

1. 12 Ω
2. $\frac{11}{12}$ Ω
3. $\frac{1}{12}$ Ω
4. $\frac{12}{11}$ Ω

Q. What resistance must be connected in parallel to a $8\Omega$ resistance to make the effective resistance equal to $4.8\Omega$?

1. $6\Omega$
2. $7\Omega$
3. $5\Omega$
4. $12\Omega$

Q.

Series arrangements are not used for domestic circuits. List any three reasons.

Q. Question 1 (a)
Judge the equivalent resistance when the following are connected in parallel−(a) $1\Omega$ and ${10}^6\Omega$.

Q.

All electrical appliances in household circuit are connected in ________.

Q. in houses how are the devices such as fans and light connected- in series or in parallel? explain the advantages of the method of connection.

Q.

Two resistors $R_1$ and $R_2$ are joined in parallel. Find the equivalent resistance. [2 MARKS]

Q. If the V-I graph of an electric circuit passess through the points ($y_1$, $x_1$) and ($y_2$, $x_2$), what will be the resistance of the circuit?

1. $\frac{(y_2-y_1)}{(x_2-x_1)}$
2. $\frac{(y_2.y_1)}{(x_2.x_1)}$
3. $\frac{(y_2+y_1)}{(x_2+x_1)}$
4. $\frac{(y_2-x_2)}{(y_1-x_1)}$

Q. what is the difference between short circuit and overlodin

Q. Given three resistors of $2\Omega ,4\Omega$ and $6\Omega$, what will be the minimum equivalent resistance that can be obtained through their various permutations?

1. $1.0909\Omega$
2. $0.9167\Omega$
3. $0.8125\Omega$
4. $1\Omega$

Q.

Question 1 (b)
Judge the equivalent resistance when the following are connected in parallel – (b) $1\Omega$, ${10}^3\Omega$ and ${10}^6\Omega$.

Q. How should the two resistances of 8 $\Omega$ each must be connected to produce an equivalent resistance of 4 $\Omega$ ?

Q.

In parallel combination, the total resistance of the circuit becomes ___the individual resistances.

1. less than

2. either less than or more than

3. more than

4. equal to

Q. In a parallel combination of resistors, the total resistance of the circuit is the individual resistances.

1. less than
2. greater than
3. equal to

Q. Three resistors each of $10\Omega$ are connected in series to a battery of potential difference 150 v. The current flowing through it is ..... A.

1. 45
2. 5
3. 15
4. 20

Q. Which among the following statements are true regarding the ring system of wiring in domestic wiring?

1. The wires form independent loops among the household appliances with the main live wire.
2. A common connection exists from the live wire to all the appliances.
3. The fuse box contains the fuse of a fixed rating.
4. A separate connection exists from the live wire to all the appliances.

Q. Four wires each of same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite corners is:

1. R
2. $\frac{R}{2}$
3. $\frac{R}{4}$
4. 2R

Q.

In parallel combination, the total resistance of the circuit becomes ___the individual resistances.

1. either less than or more than

2. equal to

3. more than

4. less than

Q. Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be ___ ohm.

1. 100Ω
2. 50Ω
3. 0Ω
4. 20Ω

Q. The voltage across all the resistances connected in parallel will

1. constantly vary
2. be infinite
3. remain the same
4. drop to zero

Q.

Find the value of $‘I^{\prime }$ for the following circuit.

1. $1A$

2. $10A$

3. $\frac{1}{16}A$

4. $\frac{1}{8}A$

Q. Which of above combinations have equivalent resistance $1\Omega$ between X and Y?

1. (a)
2. (b)
3. (c)
4. (d)

Q. What resistance must be connected in parallel to a $8\Omega$ resistance to make the effective resistance equal to $4.8\Omega$?

1. $6\Omega$
2. $7\Omega$
3. $5\Omega$
4. $12\Omega$

Q. Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.