Electricity Test

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Electricity Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

Two wires A and B of same metal are connected in parallel. Wire A has length $$l$$ and radius $$r$$ and wire B has length $$2l$$ and radius $$2r$$. then the ratio of total resistance of parallel combination and the resistance of wire A is

A
$$1 : 2$$

B
$$1 : 3$$

C
$$1 : 4$$

D
$$1 : 5$$

Solution
Question 2
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 3
1 / -0

1μA =________ mA

A
$$10^{-16}$$

B
$$10^{-3}$$

C
$$10^{3}$$

D
$$10^{6}$$

Solution

One microampere is $$1μA = 10^{-6}A$$
On rewriting it,
$$1 \mu A=(10^{-3}) \times (10^{-3})A$$
Since $$1 mA=10^{-3}A$$
So $$1 \mu A= 10^{-3}mA$$
Question 4
1 / -0

The resistance of one conducting wire is $$10 $$. How much electric current will flow by connecting it with a battery of $$1.5 V$$ ?

A
$$0.15 mA$$

B
$$1.5 mA$$

C
$$15 mA$$

D
$$150 mA$$

Solution

From Ohm's law,
$$V = IR$$
$$ \Rightarrow I = \dfrac{V}{R}= \dfrac{1.5}{10}= 0.15A = 150 mA$$
Question 5
1 / -0

If the five equal pieces of a resistance wire having $$5 $$ resistance each is connected in parallel, then their equivalent resistance will be

A
$$1/5 $$

B
$$1 $$

C
$$5 $$

D
$$25 $$

Solution

Number of resistance given $$n=5$$
Resistance of each resistor $$R=5\Omega$$
All resistors are connected in parallel

$$\dfrac 1{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}+\dfrac{1}{R_5}+\dfrac{1}{R_5}=\dfrac{5}{R}$$

$$\dfrac 1{R_{eq}}=\dfrac{5}{5}=1\ \Omega$$
Question 6
1 / -0

Materials which allow current to pass through them easily are called?

A
Insulator

B
Conductor

C
Switch

D
Battery

Solution

Materials which allow current to pass through them easily are called as conductor. The most common conductors are metals: copper, silver, gold, platinum and aluminum etc.
So, the correct option is $$(B)$$
Question 7
1 / -0

The amperage of the fuse wire used in a circuit that works on $$230 \ V$$ is $$2.2 \ A$$. If so. the power of the device is

A
less than $$300 \ W$$

B
$$300 \ W$$ to $$500 \ W$$

C
between $$500 \ W$$ and $$510 \ W$$

D
more than $$510 \ W$$

Solution

The amperage of the fuse wire used in a circuit that works on $$V = 230 \ V$$ is $$i = 2.2 \ A$$.

Power, $$P = Vi = 230 \times 2.2 = 506 \ W$$

Hence, the power of the device is between $$500 \ W$$ and $$510 \ W$$.

The correct option is C.
Question 8
1 / -0

If $$500\Omega$$ of resistance is made by adding five $$100\Omega$$ resistance of tolerance $$4\%$$, then the tolerance of the combination is .

A
$$5\%$$

B
$$4\%$$

C
$$20\%$$

D
$$10\%$$

Solution

Individual resisistors are having resistance:
$$R=100\pm 4$$
On combining 5 similar resistors we get:
$$5R=500\pm 20$$
So, tolerance of the combination is also $$4\%$$
Question 9
1 / -0

Answer the question:
Two $$5.0\Omega$$ resistors are connected as shown in the diagram.
What is the total resistance of the combination ?

A
less than $$5.0\Omega$$

B
$$5.0\Omega$$

C
more than $$5.0\Omega$$ but less than $$10.0\Omega$$

D
$$10.0\Omega$$

Solution

As we can see that both resistance are connected in parallel.
For parallel combination:
$$R_{eq}=\dfrac{R_1R_2}{R_1+R_2}$$

$$R_{eq}=\dfrac{5\times 5}{5+5}=2.5\Omega$$

Hence option A is correct, equivalent resistance is less than 5 ohm
Question 10
1 / -0

In which direction conventional current flow in an electric circuit:

A
Negative to positive

B
Positive to negative

C
Both A & B

D
None of these

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Re-Attempt Weekly Quiz Competition

Electricity Test - 73

Result

Electricity Test - 73

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Rank

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SHARING IS CARING

Question 1

$$1 : 2$$

$$1 : 3$$

$$1 : 4$$

$$1 : 5$$

Solution

Question 2

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

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

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

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

Solution

Question 3

$$10^{-16}$$

$$10^{-3}$$

$$10^{3}$$

$$10^{6}$$

Solution

Question 4

$$0.15 mA$$

$$1.5 mA$$

$$15 mA$$

$$150 mA$$

Solution

Question 5

$$1/5 $$

$$1 $$

$$5 $$

$$25 $$

Solution

Question 6

Insulator

Conductor

Switch

Battery

Solution

Question 7

less than $$300 \ W$$

$$300 \ W$$ to $$500 \ W$$

between $$500 \ W$$ and $$510 \ W$$

more than $$510 \ W$$

Solution

Question 8

$$5\%$$

$$4\%$$

$$20\%$$

$$10\%$$

Solution

Question 9

less than $$5.0\Omega$$

$$5.0\Omega$$

more than $$5.0\Omega$$ but less than $$10.0\Omega$$

$$10.0\Omega$$

Solution

Question 10

Negative to positive

Positive to negative

Both A & B

None of these

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