Current Electricity Test

Result

Current Electricity Test - 84

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Weekly Quiz Competition

Question 1
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The ratio of lengths and diameters of two resistance wires of the same material are 4: 1 and 2: 1 respectively. The two wires are connected in the left and right gaps of Wheatstone's metre bridge. Find the distance of the null point from the left end of the wire.

A
60 cm

B
10 cm

C
90 cm

D
50 cm

Solution
Question 2
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Potential gradient remains constant until

A
current in potentiometer wire remains constant

B
potential difference across the potentiometer wire remains constant

C
none of the above

D
both

Solution
Question 3
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The power factor of a circuit in which a box having unknown electrical devices connected in series with a resistor of resistance $$3\Omega$$ is $$3/5$$. The reactance of the box is

A
$$5\Omega$$

B
$$\dfrac{5}{3}\Omega$$

C
$$4\Omega$$

D
$$\dfrac{4}{3}\Omega$$

Solution

The correct option is C
Question 4
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Two cells of e.m.f. 10$$\mathrm { V } \& 15 \mathrm { V }$$ are connected in parallel to each other between points A $$\& \mathrm { B }$$ .The cell of e.m.f. 10$$\mathrm { V }$$ is ideal but the cell of e.m.f. 15$$\mathrm { V }$$ has internal resistance 1$$\mathrm { \Omega }$$ . The equivalent e.m.f. between $$\mathrm { A }$$ and $$\mathrm { B }$$ is:

A
$$\frac { 25 } { 2 } \mathrm { V }$$

B
not defined

C
15$$\mathrm { V }$$

D
10$$\mathrm { V }$$

Solution
Question 5
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If the mean free path of gaseous molecules is $$60cm$$ at a pressure of $$1\times 10^{-4}mm$$ $$Hg$$, what will be its mean free path when the pressure is increased by $$100$$ times at constant temperature?

A
$$6.0\times 10^{-1}cm$$

B
$$6.0cm$$

C
$$6.0\times 10^{1}cm$$

D
$$6.0\times 10^{2}cm$$

Solution
Question 6
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Meeta connected 4 resistors in parallel. Each has a resistance of $$ 2 \Omega $$. Find the effective resistance .

A
$$8\Omega $$

B
$$4\Omega $$

C
$$0.5\Omega $$

D
$$0.4\Omega $$

Solution
Question 7
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For a $$DC$$ circuit, Kirchoff's rules yield the following equations.
$$I_{3}=I_{1}+I_{2}$$
$$10 = 3I_{1}-2I_{2}$$
$$50=2I_{2}+9.6I_{3}$$
What is the current $$I_{2}$$ (Amps)?

A
$$0.131$$

B
$$-1.37$$

C
$$0.245$$

D
$$-3.5$$

E
$$1.00$$

Solution
Question 8
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In the circuit shown, a four-wire potentiometer is made of a $$400 cm$$ long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is $$r = 0.01 \Omega/cm$$. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be :-

A
$$0.20 V$$

B
$$0.25 V$$

C
$$0.75 V$$

D
$$0.50 V$$

Solution

Resistance of wire $$AB = 400 \times 0.01 = 4 \Omega$$
$$i = \dfrac{3}{6} = 0.5 A$$
Now voltmeter reading = i (Resistance of 50 cm length)
$$= (0.5 A) (0.01 \times 50) = 0.25 $$volt
Question 9
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Directions For Questions

Consider the circuit shown in Fig., after switch S is closed.

...view full instructions

What amount of charge will flow through the battery?

A
$$20\mu C$$

B
$$60\mu C$$

C
$$40\mu C$$

D
No charge will flow

Solution
Question 10
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In Fig . I is equal to

A
1.5A

B
0.4A

C
0.9A

D
0.7A

Solution