Electricity Test

Result

Electricity Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

A toaster operating at $$240V$$ has a resistance of 120$$\Omega $$. The power is

A
$$400 W$$

B
$$200 W$$

C
$$480 W$$

D
$$240 W$$

Solution
Question 2
1 / -0

What is the minimum resistance which can be made using five resistors each of $$\dfrac{1}{5} \Omega$$?

A
$$\dfrac{1}{5}\Omega$$

B
$$\dfrac{1}{25}\Omega$$

C
$$\dfrac{1}{10}\Omega$$

D
$$\dfrac{1}{50} \Omega$$

Solution

For minimum resistance resistors should be connected in parallel combination.
Suppose value of one resistance is $$R$$.
$$R = \dfrac{1}{5} \Omega$$
Equivalent resistance of $$5$$ resistance-
$$\dfrac{1}{R_{eq}} = \dfrac{1}{R}+\dfrac{1}{R}+\dfrac{1}{R}+\dfrac{1}{R}+\dfrac{1}{R}$$

$$\Rightarrow \dfrac{1}{R_{eq}} = \dfrac{5}{R}$$

$$\Rightarrow {R_{eq}} = \dfrac{R}{5}$$

put the value of $$R$$-

$$\Rightarrow {R_{eq}} = \dfrac{1}{5 \times 5}$$

$$\Rightarrow {R_{eq}} = \dfrac{1}{25} \Omega$$
Question 3
1 / -0

Inside a cell in a closed circuit the conventional electric current

A
always travels from - ve terminal to + ve terminal

B
always travels from + ve terminal to - ve terminal

C
may travel from +ve terminal to -ve terminal

D
may travel from -ve terminal to +ve terminal

Solution

Inside a cell in a closed circuit, the conventional electric current always travels from negative terminal to positive terminal.
Question 4
1 / -0

Ashokbhai goes to an electric shop to buy an electric bulb to obtain light in a small room of his home. Which of the following statement is scientifically correct

A
Give bulb of $$60\ V$$

B
Give bulb of $$60\ J/s$$

C
Give bulb of $$60\ A$$

D
Give bulb of $$60\ W$$

Solution

Give bulb of $$60W$$ is the right statement to say while buying a bulb because in market bulbs are sold according to their power ratings and with power ratings it is easy to identify which bulb will suit a particular requirement.
Question 5
1 / -0

Find the current flowing through the resistance $${ R }_{ 1 }$$ of the circuit shown in the figure if the resistances are equal to $${ R }_{ 1 }=10\Omega ,{ R }_{ 2 }=20\Omega $$ and $${ R }_{ 3 }=30\Omega $$ and the potential of points 1,2 and 3 are equal to $${ \varphi }_{ 2 }=6V,and{ \varphi }_{ 3 }$$ 5 V.

A
0.1 A

B
0.2 A

C
0.3 A

D
0.4 A

Solution
Question 6
1 / -0

A uniform wire is cut into $$10$$ equal parts and all the equal parts are connected in parallel. The effective resistance

A
decreases $$10$$ times

B
increases $$10$$ times

C
increases $$100$$ times

D
decreases $$100$$ times

Solution
Question 7
1 / -0

When three resistors of resistances $$ 3 \Omega, 4 \Omega $$ and 5 $$ \Omega $$ are connected in parallel, the currents
through them are in the ratio

A
$$5:4:3$$

B
$$20:15:12$$

C
$$3:4:5$$

D
$$9:8:7$$

Solution
Question 8
1 / -0

Inside a cell in a closed circuit the conventional electric current:

A
always travels from $$- ve$$ terminal to $$+ ve$$ terminal

B
always travels from $$+ ve$$ terminal to $$- ve$$ terminal

C
may travels from $$- ve$$ terminal to $$+ ve$$ terminal

D
may travels from $$+ ve$$ terminal to $$- ve$$ terminal

Solution

The electric current was considered to be the flow of positive charges and the direction of flow of positive charges was taken to be the direction of electric current. Conventionally, in an electric circuit, the direction of electric current is taken as opposite to the direction of the flow of electrons, which are negative charges.
Inside a cell, in a closed circuit the conventional electric current always travels from $$−ve$$ terminal to $$+ve$$ terminal.
Question 9
1 / -0

A lamp of $$ 600 \mathrm{W}-240 \mathrm{V} $$ is connected to 220 $$ \mathrm{V} $$ mains. Its resistance is

A
$$

96 \Omega

$$

B
$$

84 \Omega

$$

C
$$

90 \Omega

$$

D
$$

64 \Omega

$$

Solution
Question 10
1 / -0

Graphs between electric current and potential difference across two conductors A and B are shown in the figure. Which of the following conductor has more resistance?

A
B

B
A

C
Both have equal resistance

D
None of these

Solution

For comman voltage $$V$$ Current in conductor B is greter then currecnt in conductor A.
ie $$i_B>i_A$$ for same value of V
From ohms law,
$$R=\dfrac VI\\R\propto\dfrac1I$$

Hence,
If $$i_B>i_A$$ $$R_A>R_B$$

Option B