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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 6051. |
A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow more brightly [MP PET 1999; MP PMT 1999] |
| A. | 25 watt bulb |
| B. | 100 watt bulb |
| C. | First 25 watt and then 100 watt |
| D. | Both with same brightness |
| Answer» B. 100 watt bulb | |
| 6052. |
An electric bulb is rated 220 volt and 100 watt. Power consumed by it when operated on 110 volt is [CPMT 1986; MP PMT 1986, 94; AFMC 2000] |
| A. | 50 watt |
| B. | 75 watt |
| C. | 90 watt |
| D. | 25 watt |
| Answer» E. | |
| 6053. |
Two heating coils, one of fine wire and the other of thick wire of the same material and of the same length are connected in series and in parallel. Which of the following statement is correct |
| A. | In series fine wire liberates more energy while in parallel thick wire will liberate more energy |
| B. | In series fine wire liberates less energy while in parallel thick wire will liberate more energy |
| C. | Both will liberate equally |
| D. | In series the thick wire will liberate more while in parallel it will liberate less energy |
| Answer» B. In series fine wire liberates less energy while in parallel thick wire will liberate more energy | |
| 6054. |
If \[{{R}_{1}}\] and \[{{R}_{2}}\] are respectively the filament resistances of a 200 watt bulb and 100 watt bulb designed to operate on the same voltage, then [NCERT 1980; CPMT 1991, 97] |
| A. | \[{{R}_{1}}\] is two times \[{{R}_{2}}\] |
| B. | \[{{R}_{2}}\] is two times \[{{R}_{1}}\] |
| C. | \[{{R}_{2}}\] is four times \[{{R}_{1}}\] |
| D. | \[{{R}_{1}}\] is four times \[{{R}_{2}}\] |
| Answer» C. \[{{R}_{2}}\] is four times \[{{R}_{1}}\] | |
| 6055. |
How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days). [NCERT 1978, 80; CPMT 1991] |
| A. | 1500 |
| B. | 5,000 |
| C. | 15 |
| D. | 150 |
| Answer» E. | |
| 6056. |
(1) The product of a volt and a coulomb is a joule. (2) The product of a volt and an ampere is a joule/second. (3) The product of volt and watt is horse power. (4) Watt-hour can be measured in terms of electron volt. State if [NCERT 1978; MP PMT 2003] |
| A. | All four are correct |
| B. | (1), (2) and (4) are correct |
| C. | (1) and (3) are correct |
| D. | (3) and (4) are correct |
| Answer» C. (1) and (3) are correct | |
| 6057. |
Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be [CPMT 1984] |
| A. | 20 watt |
| B. | 60 watt |
| C. | 80 watt |
| D. | 100 watt |
| Answer» D. 100 watt | |
| 6058. |
A coil takes 15 min to boil a certain amount of water, another coil takes 20 min for the same process. Time taken to boil the same amount of water when both coil are connected in series [DCE 2005] |
| A. | 5 min |
| B. | 8.6 min |
| C. | 35 min |
| D. | 30 min |
| Answer» D. 30 min | |
| 6059. |
3 identical bulbs are connected in series and these together dissipate a power P. If now the bulbs are connected in parallel, then the power dissipated will be [DPMT 2005] |
| A. | \[\frac{P}{3}\] |
| B. | 3P |
| C. | 9P |
| D. | \[\frac{P}{9}\] |
| Answer» D. \[\frac{P}{9}\] | |
| 6060. |
Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then [Orissa JEE 2005] |
| A. | X will glow brighter |
| B. | Resistance of Y is greater than X |
| C. | Heat produced in Y will be greater than X |
| D. | Voltage drop in X will be greater than Y |
| Answer» B. Resistance of Y is greater than X | |
| 6061. |
A railway compartment is lit up by thirteen lamps each taking 2.1 amp at 15 volts. The heat generated per second in each lamp will be [J & K CET 2005] |
| A. | \[4.35\,cal\] |
| B. | \[5.73\,\,cal\] |
| C. | \[7.5\,\,cal\] |
| D. | \[2.5\,cal\] |
| Answer» D. \[2.5\,cal\] | |
| 6062. |
Three equal resistors connected in series across a source of e.m.f. together dissipate 10 watt. If the same resistors are connected in parallel across the same e.m.f., then the power dissipated will be [CBSE PMT 1998; KCET (Engg.) 1999; MP PMT 2003] |
| A. | 10 watt |
| B. | 30 watt |
| C. | 10/3 watt |
| D. | 90 watt |
| Answer» E. | |
| 6063. |
A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by [KCET 2005] |
| A. | 1.08 ´ 104 J |
| B. | 1.08 ´ 10-4 volt |
| C. | 1.8 ´ 104 J |
| D. | 1.8 ´ 104 volt |
| Answer» B. 1.08 ´ 10-4 volt | |
| 6064. |
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use [AIEEE 2005] |
| A. | \[400\,\Omega \] |
| B. | \[200\,\Omega \] |
| C. | \[40\text{ }\Omega \] |
| D. | \[20\,\Omega \] |
| Answer» D. \[20\,\Omega \] | |
| 6065. |
A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be [AIEEE 2005] |
| A. | One fourth |
| B. | Halved |
| C. | Doubled |
| D. | Four times |
| Answer» D. Four times | |
| 6066. |
Two resistors whose value are in ratio 2 : 1 are connected in parallel with one cell. Then ratio of power dissipated is [RPMT 2000] |
| A. | 2 : 1 |
| B. | 4 : 1 |
| C. | 1 : 2 |
| D. | 1 : 1 |
| Answer» D. 1 : 1 | |
| 6067. |
If in the circuit, power dissipation is 150 W, then R is [AIEEE 2002] |
| A. | 2 W |
| B. | 6 W |
| C. | 5 W |
| D. | 4 W |
| Answer» C. 5 W | |
| 6068. |
Find the power of the circuit [AIEEE 2002] |
| A. | 1.5 W |
| B. | 2 W |
| C. | 1 W |
| D. | None of these |
| Answer» D. None of these | |
| 6069. |
The current flowing through a lamp marked as 50 W and 250 V is [MH CET (Med.) 2001] |
| A. | 5 amp |
| B. | 2.5 amp |
| C. | 2 amp |
| D. | 0.2 amp |
| Answer» E. | |
| 6070. |
What is immaterial for an electric fuse wire [UPSEAT 1999] |
| A. | Specific resistance of the wire |
| B. | Radius of the wire |
| C. | Length of the wire |
| D. | Current flowing through the wire |
| Answer» D. Current flowing through the wire | |
| 6071. |
The electric current passing through a metallic wire produces heat because of [BHU 1994] |
| A. | Collisions of conduction electrons with each other |
| B. | Collisions of the atoms of the metal with each other |
| C. | The energy released in the ionization of the atoms of the metal |
| D. | Collisions of the conduction electrons with the atoms of the metallic wires |
| Answer» E. | |
| 6072. |
The maximum current that flows through a fuse wire before it blows out varies with its radius as [SCRA 1998] |
| A. | \[{{r}^{3/2}}\] |
| B. | r |
| C. | \[{{r}^{2/3}}\] |
| D. | \[{{r}^{1/2}}\] |
| Answer» B. r | |
| 6073. |
The electric bulbs have tungsten filaments of same length. If one of them gives 60 watt and other 100 watt, then [NCERT 1979] |
| A. | 100 watt bulb has thicker filament |
| B. | 60 watt bulb has thicker filament |
| C. | Both filaments are of same thickness |
| D. | It is possible to get different wattage unless the lengths are different |
| Answer» B. 60 watt bulb has thicker filament | |
| 6074. |
Match the List I with the List II from the combination shown. In the left side (List I) there are four different conditions and in the right side (List II), there are ratios of heat produced in each resistance for each condition : [ISM Dhanbad 1994] List IList II(I)Two wires of same resistance are connected in series and same current is passed through them(A) 1 : 2(II)Two wires of resistance R and 2R ohm are connected in series and same P.D. is applied across them(B) 4 : 1(III)Two wires of same resistance are connected in parallel and same current is flowing through them(C) 1 : 1(IV)Two wires of resistances in the ratio 1 : 2 are connected in parallel and same P.D. is applied across them(D) 2 : 1 |
| A. | \[I-B;\ II-A;\ III-C;\ IV-D\] |
| B. | \[I-C;\ II-D;\ III-C;\ IV-D\] |
| C. | \[I-B;\ II-D;\ III-A;\ IV-C\] |
| D. | \[I-A;\ II-B;\ III-D;\ IV-C\] |
| Answer» 3orr53t 1nsw5r:. \[I-A;\ II-B;\ III-D;\ IV-C\] | |
| 6075. |
An electric iron draws 5 amp, a TV set draws 3 amp and refrigerator draws 2 amp from a 220 volt main line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse used may be of [ISM Dhanbad 1994] |
| A. | 20 amp |
| B. | 5 amp |
| C. | 15 amp |
| D. | 10 amp |
| Answer» D. 10 amp | |
| 6076. |
An electric lamp is marked 60 W, 230 V. The cost of a 1 kWh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 day is [Kerala (Med.) 2002] |
| A. | Rs. 10 |
| B. | Rs. 16 |
| C. | Rs. 18 |
| D. | Rs. 20 |
| Answer» D. Rs. 20 | |
| 6077. |
A heater coil connected to a supply of a 220 V is dissipating some power \[{{P}_{1}}.\] The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power \[{{P}_{2}}.\] The ratio of power \[{{P}_{1}}\,\,:\,\,{{P}_{2}}\] is [AFMC 2004] |
| A. | 2 : 1 |
| B. | 1 : 2 |
| C. | 1 : 4 |
| D. | 4 : 1 |
| Answer» D. 4 : 1 | |
| 6078. |
If 2.2kW power is transmitted through a \[100\Omega \] line at \[22,000V,\] the power loss in the form of heat will be [MP PET 2004] |
| A. | 0.1 W |
| B. | 1 W |
| C. | 10 W |
| D. | 100 W |
| Answer» C. 10 W | |
| 6079. |
Three identical resistances A, B and C are connected as shown in the given figure. The heat produced will be maximum [MP PMT 2004] |
| A. | In B |
| B. | In B and C |
| C. | In A |
| D. | Same for A, B and C |
| Answer» D. Same for A, B and C | |
| 6080. |
Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then, [KCET 2004] |
| A. | Both draw the same current |
| B. | A draws more current than B |
| C. | B draws more current than A |
| D. | Current drawn are in the ratio of their resistances |
| Answer» D. Current drawn are in the ratio of their resistances | |
| 6081. |
The heat produced by a 100 watt heater in 2 minute will be equal to [BCECE 2004] |
| A. | \[12\times {{10}^{3}}\,J\] |
| B. | \[10\times {{10}^{3}}\,J\] |
| C. | \[6\times {{10}^{3}}\,J\] |
| D. | \[3\times {{10}^{3}}\,J\] |
| Answer» B. \[10\times {{10}^{3}}\,J\] | |
| 6082. |
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage, [BCECE 2004] |
| A. | 2 : 1 |
| B. | 1 : 2 |
| C. | 2 : 9 |
| D. | 9 : 2 |
| Answer» D. 9 : 2 | |
| 6083. |
A hot electric iron has a resistance of \[80\,\Omega \] and is used on a 200 V source. The electrical energy spent, if it is used for two hours, will be [Pb. PET 2002] |
| A. | 8000 Wh |
| B. | 2000 Wh |
| C. | 1000 Wh |
| D. | 800 Wh |
| Answer» D. 800 Wh | |
| 6084. |
What is immaterial for an electric fuse wire [MNR 1984; MP PMT 2002; CPMT 1996, 2003] |
| A. | Its specific resistance |
| B. | Its radius |
| C. | Its length |
| D. | Current flowing through it |
| Answer» D. Current flowing through it | |
| 6085. |
A 10 V storage battery of negligible internal resistance is connected across a \[50\,\Omega \] resistor. How much heat energy is produced in the resistor in 1 hour [Pb. PET 2001] |
| A. | 7200 J |
| B. | 6200 J |
| C. | 5200 J |
| D. | 4200 J |
| Answer» B. 6200 J | |
| 6086. |
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be [Pb. PET 2001] |
| A. | 9 : 4 |
| B. | 4 : 3 |
| C. | 3 : 8 |
| D. | 3 : 2 |
| Answer» E. | |
| 6087. |
The resistor of resistance 'R' is connected to 25 V supply and heat produced in it is 25 J/sec. The value of R is [Orissa PMT 2004] |
| A. | \[225\Omega \] |
| B. | \[1\Omega \] |
| C. | \[25\Omega \] |
| D. | \[50\Omega \] |
| Answer» D. \[50\Omega \] | |
| 6088. |
Some electric bulbs are connected in series across a 220 V supply in a room. If one bulb is fused then remaining bulbs are connected again in series across the same supply. The illumination in the room will [J & K CET 2004] |
| A. | Increase |
| B. | Decrease |
| C. | Remains the same |
| D. | Not continuous |
| Answer» B. Decrease | |
| 6089. |
In an electric heater 4 amp current passes for 1 minute at potential difference of 250 volt, the power of heater and energy consumed will be respectively [DPMT 2003] |
| A. | 1 kW, 60 kJ |
| B. | 0.5 kW, 30 kJ |
| C. | 10 kW, 600 kJ |
| D. | None of these |
| Answer» B. 0.5 kW, 30 kJ | |
| 6090. |
What is the ratio of heat generated in R and 2R [DCE 2003] |
| A. | 2 : 1 |
| B. | 1 : 2 |
| C. | 4 : 1 |
| D. | 1 : 4 |
| Answer» B. 1 : 2 | |
| 6091. |
If a 2 kW boiler is used everyday for 1 hour, then electrical energy consumed by boiler in thirty days is [BHU 2004] |
| A. | 15 unit |
| B. | 60 unit |
| C. | 120 unit |
| D. | 240 unit |
| Answer» C. 120 unit | |
| 6092. |
\[A\,\,{{5}^{o}}C\] rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to [BHU 2004] |
| A. | \[{{5}^{o}}C\] |
| B. | \[{{10}^{o}}C\] |
| C. | \[{{20}^{o}}C\] |
| D. | \[{{40}^{o}}C\] |
| Answer» D. \[{{40}^{o}}C\] | |
| 6093. |
Two bulbs of 100 W and 200 W working at 220 volt are joined in series with 220 volt supply. Total power consumed will be approximately. [Pb. PET 2003; BHU 2005] |
| A. | 65 watt |
| B. | 33 watt |
| C. | 300 watt |
| D. | 100 watt |
| Answer» B. 33 watt | |
| 6094. |
A 220 volt, 1000 W bulb is connected across a 110 volt mains supply. The power consumed will be [AIEEE 2003] |
| A. | 1000 W |
| B. | 750 W |
| C. | 500 W |
| D. | 250 W |
| Answer» E. | |
| 6095. |
An electric bulb is rated 60W, 220V. The resistance of its filament is [MP PET 2003] |
| A. | 708 W |
| B. | 870 W |
| C. | 807 W |
| D. | 780 W |
| Answer» D. 780 W | |
| 6096. |
If a 30 V, 90 W bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb [MP PMT 2002; KCET 2003] |
| A. | 10 ohm |
| B. | 20 ohm |
| C. | 30 ohm |
| D. | 40 ohm |
| Answer» D. 40 ohm | |
| 6097. |
Three electric bulbs of rating 60W each are joined in series and then connected to electric mains. The power consumed by these three bulbs will be [MP PET 2003; CBSE PMT 2004] |
| A. | 180 W |
| B. | 60 W |
| C. | 20 W |
| D. | \[\frac{20}{3}W\] |
| Answer» D. \[\frac{20}{3}W\] | |
| 6098. |
A bulb has specification of one kilowatt and 250 volts, the resistance of bulb is [MP PMT 2002] |
| A. | 125 W |
| B. | 62.5 W |
| C. | 0.25 W |
| D. | 625 W |
| Answer» C. 0.25 W | |
| 6099. |
Electric bulb 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, 10 W. Maximum number of bulbs that can be connected so that they glow in full power is [CPMT 2002] |
| A. | 2 |
| B. | 8 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 6100. |
An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Now its power is [AIIMS 2002] |
| A. | 100W |
| B. | 40W |
| C. | 20W |
| D. | 10W |
| Answer» E. | |