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question_answer1)
What is meant by 5 A?
A)
A charge of 5 C flows through a point in 1 second done
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B)
5 V electricity flows across \[1\Omega \] of resistance done
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C)
5V electricity is causing 1 C of charge to flow done
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D)
A charge of 5 C flows through a point in 5 seconds. done
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question_answer2)
What is the charge flowing through a resistor R in 4 s?
A)
3 C done
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B)
6 C done
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C)
12 C done
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D)
18 C done
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question_answer3)
What is the potential difference across the\[2\,\Omega \], resistor in the circuit shown below?
A)
1V done
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B)
2V done
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C)
6V done
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D)
12V done
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question_answer4)
A \[10\,\Omega \] resistance wire AB of length 2 m is connected in a circuit as shown below.
What is the reading on the voltmeter when the jockey is at point C?
A)
1.6 V done
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B)
2.4 V done
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C)
9.6 V done
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D)
12 V done
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question_answer5)
When the temperature of a pure metallic conductor is increased, then what happens to its resistance?
A)
It decreases. done
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B)
It increases. done
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C)
It may increase or decrease. done
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D)
It remains the same. done
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question_answer6)
What is the effective resistance of the four resistors in the circuit shown below?
A)
\[\text{1}.\text{5}\,\Omega \] done
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B)
\[8.0\,\Omega \] done
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C)
\[8.2\,\Omega \] done
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D)
\[33\,\Omega \] done
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question_answer7)
The resistance of a metal wire of length 2 m is 400 at \[20{}^\circ C\]. If the diameter of the wire is 1 mm, what will be the resistivity of the metal at that temperature?
A)
\[1.28\times {{10}^{-8}}\Omega m\] done
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B)
\[1.57\times {{10}^{-8}}\Omega m\] done
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C)
\[1.75\times {{10}^{-9}}\Omega m\] done
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D)
\[1.88\times {{10}^{-8}}\Omega m\] done
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question_answer8)
An electric fan rated 50 W operates 20 hours in a day. What is the cost of the energy to operate it for 30 days at Rs. 2 per kWh?
A)
Rs. 50 done
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B)
Rs. 60 done
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C)
Rs. 70 done
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D)
Rs. 80 done
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question_answer9)
What is the effective resistance between points P and Q in the circuit shown below?
A)
\[0.\text{15 }\Omega \] done
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B)
\[0.\text{66 }\Omega \] done
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C)
\[\text{1}.\text{5 }\Omega \] done
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D)
\[\text{1}.\text{75 }\Omega \] done
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question_answer10)
Two resistors of \[\text{4 }\Omega \] and \[\text{6 }\Omega \], are connected in parallel with a 6 V battery of negligible resistance. Calculate the current flowing through the battery.
A)
1 A done
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B)
1.5 A done
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C)
2 A done
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D)
2.5 A done
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question_answer11)
What is the potential difference across the \[\text{2 }\Omega \] resistor?
A)
2 V done
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B)
4 V done
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C)
6 V done
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D)
12 V done
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question_answer12)
On what factors does the heat generated in a conductor depend upon?
A)
Directly proportional to time done
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B)
Inversely proportional to time done
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C)
Directly proportional to density done
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D)
Inversely proportional to mass done
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question_answer13)
You are given four bulbs of 25 W, 40 W, 50 W and 60 W. Which bulb has the lowest resistance?
A)
25 W done
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B)
50 W done
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C)
60 W done
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D)
40 W done
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question_answer14)
Which of the following changes to a wire will double its resistance?
A)
B)
C)
D)
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question_answer15)
A 625 mm long metallic wire offers 4 ohms resistance. If the resistivity of a metal is \[\text{4}.\text{8}\times \text{1}{{0}^{-\text{7}}}\text{ ohm}\] metre, then calculate the area of the cross section of the wire.
A)
\[0.25\times {{10}^{-5}}{{m}^{2}}\] done
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B)
\[0.50\times {{10}^{-3}}{{m}^{2}}\] done
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C)
\[0.75\times {{10}^{-7}}{{m}^{2}}\] done
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D)
\[1.00\times {{10}^{-4}}{{m}^{2}}\] done
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question_answer16)
Three resistors are connected to form the sides of a triangle ABC. The resistance of side AB is 40 ohms, side BC is 60 ohms and that of side CA is 100 ohms.
Find the effective resistance between points A and B in ohms.
A)
\[32\,\Omega \] done
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B)
\[50\,\Omega \] done
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C)
\[64\,\Omega \] done
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D)
\[200\,\,\Omega \] done
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question_answer17)
Four resistors of \[2\,\,\Omega \] each are joined end to end to form a square ABCD.
Calculate the equivalent resistance of the combination between any two adjacent corners.
A)
\[1.5\,\,\Omega \] done
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B)
\[3.0\,\,\Omega \] done
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C)
\[4.5\,\,\Omega \] done
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D)
\[6.0\,\,\Omega \] done
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question_answer18)
Observe the given circuit.
Find the current passing through resistor.
A)
0.72 A done
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B)
0.80 A done
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C)
0.48 A done
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D)
0.62 A done
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question_answer19)
An electrician has two resistances. By joining them in series or in parallel combinations, he is able to obtain resistances of \[\text{3 }\Omega ,\text{ 4 }\Omega ,\text{ 12}\,\Omega \] and \[\text{16 }\Omega \]. Identify the two resistances with him.
A)
\[4\Omega \] and \[16\,\Omega \] done
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B)
\[4\,\Omega \] and \[12\,\Omega \] done
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C)
\[7\,\Omega \] and \[9\,\Omega \] done
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D)
\[6\,\Omega \] and \[10\,\Omega \] done
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question_answer20)
What is the current 3t point X in the circuit shown below?
A)
1 A done
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B)
2 A done
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C)
3 A done
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D)
4 A done
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question_answer21)
What is the smallest resistance that can be obtained by using a \[6\,\,\Omega \]. resistor and \[12\,\,\Omega \]. resistor respectively connected in parallel?
A)
\[4\,\,\Omega \] done
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B)
\[6\,\,\Omega \] done
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C)
\[8\,\,\Omega \] done
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D)
\[12\,\,\Omega \] done
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question_answer22)
A battery connected with two resistors in series is shown below.
If the voltage of one resistor is 9 V, what is the voltage across the other resistor?
A)
2V done
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B)
6V done
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C)
3V done
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D)
12V done
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question_answer23)
Two bulbs A and Bare rated 100 W, 120V and 10 W, 120 V respectively. They are connected in parallel across a 120 V source. Find the current passing through each bulb and the bulb which consumes more energy?
A)
0.83 A, Bulb B done
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B)
0.083 A, Bulb A done
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C)
0.83 A, Bulb A done
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D)
0.083 A, Bulb B done
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question_answer24)
What is the potential difference across bulb X in the circuit shown below?
A)
1.5 V done
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B)
3.0 V done
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C)
4.5 V done
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D)
6.0 V done
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question_answer25)
A wire of resistance R is doubled by stretching. What will be the resistance of half of this stretched wire?
A)
\[\frac{R}{2}\] done
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B)
R done
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C)
2R done
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D)
4R done
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question_answer26)
Three resistors of \[\text{2}.\text{5 }\Omega ,\text{ 12 }\Omega \] and \[\text{3}.\text{5 }\Omega \] are connected in series. Which of the given single resistors can replace the three of them in a circuit?
A)
\[\text{16 }\Omega \] done
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B)
\[\text{4 }\Omega \] done
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C)
\[\text{18 }\Omega \] done
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D)
\[\text{8 }\Omega \] done
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question_answer27)
What is the use of a variable resistor in Ohm's law experiment?
(i) It changes the voltage across a fixed resistor. |
(ii) It changes the resistance across the fixed resistor. |
(iii) It changes the current flowing through the fixed resistor. |
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) and (iii) done
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D)
All the three done
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question_answer28)
A 2 V battery is connected across a \[\text{4 }\Omega \] resistor. Calculate the heat produced in 10 seconds.
A)
20 J done
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B)
30 J done
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C)
10 J done
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D)
40 J done
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question_answer29)
How much current will flow through a resistor of resistance \[\text{12 }\Omega \] if a battery of 18 V is connected across it?
A)
3.0 A done
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B)
4.5 A done
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C)
1.5 A done
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D)
6.0 A done
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question_answer30)
The equivalent resistance of the series combination of two equal resistances is S. When they are joined in parallel, the total resistance is 'P'. If S = nP, what is the value of 'n' ?
A)
4 done
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B)
3 done
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C)
2 done
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D)
1 done
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question_answer31)
In an experiment, four resistance wires made from the same material are connected in between the terminals P and Q in the circuit as shown below. The length and diameter of the wires are different.
Which wire will give the smallest reading on the ammeter?
A)
B)
C)
D)
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question_answer32)
Identify the factor on which the resistance of a wire does NOT depend.
A)
Area of cross section done
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B)
Length done
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C)
Temperature done
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D)
Voltage applied done
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question_answer33)
Why is the neck of the glass bulb of an electric bulb sealed?
A)
To protect the filament from oxidation done
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B)
To maintain the temperature inside done
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C)
To prevent the effect of humidity done
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D)
All of the above done
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question_answer34)
A What is the charge on a wire, when current flows through it?
A)
Zero charge done
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B)
Positive charge done
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C)
Negative charge done
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D)
Neutral charge done
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question_answer35)
Several \[\text{150 }\Omega \] resistors are to be connected in such a way that a current of 2 A flows from a 50 V source. How many such resistors are required along with a mode to connect them?
A)
6 series done
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B)
8 series done
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C)
6 parallel done
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D)
8 parallel done
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question_answer36)
A How much current is drawn by a bulb rated 100 W and designed for a mains supply of 250 V when operated normally?
A)
0.20 A done
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B)
0.40 A done
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C)
0.60 A done
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D)
0.80 A done
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question_answer37)
An iron box has a resistance coil of \[\text{30 }\Omega \] and takes a current of 10 A. Calculate the heat developed by it in kJ in 1 minute.
A)
180 kJ done
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B)
90 kJ done
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C)
45 kJ done
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D)
135 kJ done
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question_answer38)
The ratios of wire A and wire B respectively are \[\frac{Length\,{{L}_{A}}}{Length\,{{L}_{B}}}=\frac{5}{18}\] and \[\frac{Diameter\,{{D}_{A}}}{Diameter\,{{D}_{B}}}=\frac{2}{3};\] \[\frac{\text{Resistivity}{{\rho }_{A}}}{\text{Resistivity}{{\rho }_{B}}}=\frac{4}{9}.\] What is the ratio of the resistance of wire A to the resistance of wire B?
A)
5 : 8 done
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B)
10 : 54 done
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C)
18 : 5 done
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D)
54 : 10 done
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question_answer39)
The ratings of three bulbs P, Q and R are given below.
P : 120V, 24W |
Q : 120V, 60W |
R : 240V, 60W |
Which of the following represents the ascending order of their resistance?
A)
P, Q, R done
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B)
Q, P, R done
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C)
R, P, Q done
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D)
Q, R, P done
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