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question_answer1)
How much work is done in moving a charge of 4 coulombs from a point at 110 volts to a point at 120 volts?
A)
20 Joules done
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B)
40 Joules done
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C)
40 Newton done
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D)
20 Newton done
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E)
None of these done
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question_answer2)
Which of the following is the work done in moving a unit charge across two points in an electric circuit?
A)
Current done
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B)
Potential difference done
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C)
Power done
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D)
Resistance done
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E)
None of these done
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question_answer3)
Which of the following will have higher number of free electrons?
A)
Nichrome done
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B)
Copper done
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C)
Constantan done
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D)
Glass done
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E)
None of these done
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question_answer4)
How much electrons should pass through a conductor in 1 second to constitute 1 ampere current, if the charge on an electron is 1.6 x 10'19 coulombs?
A)
\[6.25\times {{10}^{18}}\] electrons done
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B)
\[6.9\times {{10}^{18}}\] electrons done
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C)
\[6.5\times {{10}^{19}}\] electrons done
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D)
\[6.25\times {{10}^{15}}\] electrons done
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E)
None of these done
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question_answer5)
What is the resistance between two points of wire carrying 4 ampere current and has potential difference of 0.2 volt?
A)
0.04 Ohm done
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B)
0.02 Ohm done
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C)
0.05 Ohm done
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D)
0.06 Ohm done
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E)
None of these done
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question_answer6)
What current will a bulb draw when connected to 110 V supply line, if the bulb draws a current of 2 A from the 220 V supply line?
A)
2 A done
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B)
3 A done
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C)
4 A done
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D)
1 A done
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E)
None of these done
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question_answer7)
What is the potential difference between the ends of a conductor of 60 Ohm resistance, when a current of 4 A flows through it?
A)
200 V done
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B)
240 V done
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C)
180 V done
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D)
150 V done
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E)
None of these done
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question_answer8)
What will be the resistance of a resistor when a 24 V battery is connected across an unknown resistor and there is a current of 2.5 m A is flowing in the circuit?
A)
\[9.6\times {{10}^{3}}\] ohms done
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B)
\[9.4\times {{10}^{3}}\] ohms done
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C)
\[9.6\times {{10}^{6}}\]ohms done
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D)
\[9.2\times {{10}^{6}}\]ohms done
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E)
None of these done
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question_answer9)
What is the resistivity of copper, if the copper wire of length 3 m and area of cross-section is \[1.6\times {{10}^{-4}}{{m}^{2}}\] has a resistance of \[3\times {{10}^{-2}}\] Ohms?
A)
\[1.4\times {{10}^{-6}}\] Ohm-metre done
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B)
\[1.6\times {{10}^{-6}}\] Ohm-metre done
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C)
\[1.6\times {{10}^{-4}}\] Ohm-metre done
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D)
\[1.6\times {{10}^{-2}}\] Ohm-metre done
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E)
None of these done
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question_answer10)
What will be the length of wire to make its resistance of 15 ohms, if copper wire has a diameter of 1 mm and resistivity of \[1.5\times {{10}^{-8}}\] ohm metre?
A)
700 m done
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B)
785.7 m done
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C)
600 m done
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D)
685.7 m done
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E)
None of these done
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question_answer11)
Magnetic field lines due to a straight wire carrying current are:
A)
Straight done
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B)
Concentric circles done
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C)
Parabolic done
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D)
Elliptical done
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E)
None of these done
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question_answer12)
Magnetic field lines inside a long current carrying solenoid are:
A)
Straight done
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B)
Circular done
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C)
Parabolic done
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D)
Elliptical done
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E)
None of these done
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question_answer13)
An AC generator is connected to an electric appliance. In 10 revolutions of the armature, the current in the appliance changes direction:
A)
5 times done
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B)
10 times done
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C)
20 times done
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D)
30 times done
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E)
None of these done
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question_answer14)
A device that can be used to produce an electric current in a circuit is a/an:
A)
Ammeter done
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B)
Motor done
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C)
Generator done
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D)
Galvanometer done
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E)
None of these done
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question_answer15)
Which of the following statements is incorrect?
(i) Resistance of a wire increases with the increase in the length of a wire. |
(ii) A thick wire has more resistance than a thin wire. |
(iii) Resistance decreases with increase in temperature. |
(iv) Ohm is the unit of resistance. |
A)
(i) and (ii) done
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B)
(ii) and (iii) done
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C)
(i) and (iii) done
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D)
(i) and (iv) done
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E)
None of these done
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question_answer16)
Which one of the following characteristics does not belong to parallel circuits?
A)
When one electrical appliance stops working then all other appliances keep working normally. done
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B)
Each appliance gets the same voltage as that of the power supply line. done
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C)
All the electrical appliances have only one switch and they cannot be turner on or off separately. done
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D)
All the above done
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E)
None of these done
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question_answer17)
By which of the following circuit diagrams we will get the resultant resistance of 6.4 ohm?
A)
B)
C)
D)
E)
None of these done
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question_answer18)
An electric fan runs from the 210 V mains. The current flowing through it is 3 A. At what rate is electrical energy transferred by the fan?
A)
90 J/S done
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B)
70 J/S done
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C)
630 J/S done
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D)
630 done
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E)
None of these done
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question_answer19)
The electrical resistivity of some substances are given below. Which of the following substances can be used to reduce the current in an electric circuit?
A)
\[0.6\times {{10}^{-8}}\] ohm metre done
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B)
\[49\times {{10}^{-8}}\] ohm metre done
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C)
\[1.6\times {{10}^{-8}}\] ohm metre done
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D)
\[1.63\times {{10}^{-16}}\] ohm metre done
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E)
None of these done
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question_answer20)
Two fuse wire X and Y of the same length are rated 25 A and 10 A. Which amongst the X and Y will be thicker?
A)
Wire X done
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B)
Wire Y done
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C)
Both [a] and [b] done
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D)
Either [a] or [b] done
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E)
None of these done
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question_answer21)
When a current of 8 A flows through a resistor of 4 ohms for 30 minutes. Find the energy transferred.
A)
128 KWh done
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B)
0.128 KWh done
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C)
125 KWh done
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D)
120 KWh done
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E)
None of these done
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question_answer22)
An electric cooler is rated 6 KW. Electrical energy costs Rs. 4.5 per KWh. The cost of using the cooler for three hours is:
A)
Rs 60.5 done
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B)
Rs 67.5 done
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C)
Rs 70 done
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D)
Rs 75 done
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E)
None of these done
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question_answer23)
The diagram given below shows a circuit containing a bulb B, a voltmeter V and an ammeter. The voltmeter reading is 5.6 volt and the ammeter reading is 7 ampere. Which of the following options is incorrect for the given circuit diagram?
A)
The resistance of the bulb is 0.8 ohm metre. done
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B)
The power of the bulb is 39.2 watt. done
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C)
The resistance of the circuit is 0.8 ohm. done
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D)
All the above done
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E)
None of these done
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question_answer24)
Where the magnetic field is strongest in a bar magnet?
A)
At poles done
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B)
At the centre done
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C)
Between poles and centre done
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D)
Either [a] or [b] done
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E)
None of these done
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question_answer25)
The magnetic field lines produced by a current carrying solenoid is similar to magnetic field produced by a:
A)
Straight current carrying conductor done
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B)
Bar Magnet done
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C)
Electromagnet done
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D)
Both [b] and [c] done
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E)
None of these done
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question_answer26)
The magnetic effect of current was discovered by:
A)
Oersted done
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B)
Maxwell done
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C)
Fleming done
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D)
Faraday done
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E)
None of these done
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question_answer27)
The magnitude of magnetic field will be maximum at which point in the given figure?
A)
P done
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B)
Q done
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C)
R done
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D)
S done
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E)
None of these done
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question_answer28)
Who among the following gave Left-hand rule for the direction of force?
A)
Fleming done
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B)
Maxwell done
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C)
Oersted done
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D)
Thomson done
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E)
None of these done
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question_answer29)
In the given figure a solenoid wound on a core of soft iron. Will the end X be a north pole or south pole when the current flows in the direction shown?
Change the direction of flow of current.
A)
North done
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B)
South done
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C)
South-North done
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D)
North-South done
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E)
None of these done
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question_answer30)
Which of the following is incorrect match?
A)
Manganin - Cu, Mn, Ni done
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B)
Constantan - Cu and Sn done
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C)
Nichrome - Ni, Cr, Mn and iron done
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D)
All the above done
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E)
None of these done
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question_answer31)
The ____ is the basis of MRL
A)
Resistance done
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B)
Bones in the body done
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C)
Magnetism done
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D)
Pressure done
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E)
None of these done
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question_answer32)
The function of commutator in an e]ectr5c motor is to:
A)
Make contact with the rotation rings. done
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B)
Reverse the direction of current flowing through the coil. done
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C)
Supply current to the coil done
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D)
All the above done
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E)
None of these done
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question_answer33)
Which of the following is represented by the forefinger of our hand in Fleming's left-hand rule?
A)
The direction of current done
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B)
The direction of magnetic field done
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C)
The direction of force done
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D)
The direction of pressure done
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E)
None of these done
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question_answer34)
The largest force experienced by a current carrying conductor placed in a magnetic field is when the angle between the conductor and the magnetic field is:
A)
\[30{}^\circ \] done
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B)
\[45{}^\circ \] done
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C)
\[90{}^\circ \] done
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D)
\[60{}^\circ \] done
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E)
None of these done
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question_answer35)
An electric motor converts:
A)
Heat energy into electrical energy done
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B)
Electrical energy into mechanical energy done
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C)
Mechanical energy into electrical energy done
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D)
Electrical energy into heat energy done
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E)
None of these done
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question_answer36)
Which way does the wire in the diagram below tend to move?
A)
Downward done
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B)
Upward done
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C)
Towards left done
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D)
Towards right done
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E)
None of these done
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question_answer37)
Which of the following statements is correct?
A)
A fuse wire has high melting point. done
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B)
Thickness of the fuse wire does not depend on the current flowing through the circuit. done
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C)
A fuse wire is connected in parallel in the electric circuits. done
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D)
A fuse wire is connected in series in the electric circuits. done
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E)
None of these done
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question_answer38)
In which of the following cases the resistance of a wire gets halved?
A)
When the length of a wire is doubled. done
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B)
When the area of cross - section of a wire is doubled. done
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C)
When the current gets halved. done
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D)
All the above done
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E)
None of these done
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question_answer39)
The current flowing in the given circuit diagram is:
A)
1.34 ampere done
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B)
2.4 ampere done
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C)
1.8 ampere done
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D)
2.9 ampere done
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E)
None of these done
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question_answer40)
The strength of magnetic field produced by a current carrying solenoid does not depend on the:
A)
Number of turns in the solenoid. done
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B)
Strength of current in the solenoid. done
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C)
Nature of "core material" used in making solenoid. done
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D)
All the above done
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E)
None of these done
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