MCQOPTIONS
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MCQOPTIONS
This section includes 253 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Commercially produced resistors for domestic use or in laboratories are of two major types: wire bound resistors and ____________ resistors. |
| A. | Nichrome |
| B. | Manganin |
| C. | Silicon |
| D. | Carbon |
| Answer» E. | |
| 102. |
An npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is 100 Ω and the output load resistance is 10 KΩ. The common emitter current gain β is: |
| A. | 102 |
| B. | 60 |
| C. | 6 × 102 |
| D. | 104 |
| Answer» B. 60 | |
| 103. |
In the given circuit, an ideal voltmeter connected across the 10 Ω resistance reads 2V. The internal resistance r, of each cell is: |
| A. | 1 Ω |
| B. | 0.5 Ω |
| C. | 1.5 Ω |
| D. | 0 Ω |
| Answer» C. 1.5 Ω | |
| 104. |
A battery of 6V is connected to the terminals of a three meter long wire of uniform thickness and resistance of 100Ω. The difference of potential between two points separated by 50 cm on the wire be |
| A. | 1 volt |
| B. | 1.5 volt |
| C. | 2 volt |
| D. | 3 volt |
| Answer» B. 1.5 volt | |
| 105. |
Figure shows three similar lamps L1, L2 and L3 connected across a power supply. If the lamp L3 is fused, how will the light emitted by L1 and L2 change? |
| A. | No change |
| B. | Brilliance of L1 decreases and that of L2 increases |
| C. | Brilliance of both L1 and L2 decreases |
| D. | Brilliance of both L1 and L2 increases |
| Answer» D. Brilliance of both L1 and L2 increases | |
| 106. |
A cell of negligible resistance and e.m.f 2 volt is connected to series combination of 2 ohm, 3 ohm and 5 ohm. The potential difference across the 3 ohm resistance is: |
| A. | 0.6 V |
| B. | 0.4 V |
| C. | 0.2 V |
| D. | 0.8 V |
| Answer» B. 0.4 V | |
| 107. |
A current of 2A flows through a 24V car head light bulb for 5 mins. How much energy transfer occurs during this time? |
| A. | 14400 joule |
| B. | 10800 joule |
| C. | 4200 joule |
| D. | 43200 joule |
| Answer» B. 10800 joule | |
| 108. |
A carbon resistance has a following colour code. What is the value of resistance? |
| A. | 530 kΩ ± 5% |
| B. | 5.3 MΩ ± 5% |
| C. | 6.4 MΩ ± 5% |
| D. | 64 kΩ ± 10% |
| Answer» B. 5.3 MΩ ± 5% | |
| 109. |
A resistor which has a silver coloured ring signifies that the resistor has __________ percent tolerance. |
| A. | 10 |
| B. | 5 |
| C. | 1 |
| D. | 20 |
| Answer» B. 5 | |
| 110. |
In Fig. the current passing through the 6-ohm resistor is: |
| A. | 0.48 A |
| B. | 0.36 A |
| C. | 0.24 A |
| D. | 1 |
| Answer» B. 0.36 A | |
| 111. |
Identify the conductor having the lowest resistivity. |
| A. | Silver |
| B. | Aluminium |
| C. | Copper |
| D. | Iron |
| Answer» B. Aluminium | |
| 112. |
_____________ is the formula used in Ohm's law which gives the relationship between the potential difference, the current and the resistance. |
| A. | I = V/2R in Amperes |
| B. | R = I*V in Amperes |
| C. | I = V*2R in Amperes |
| D. | I = V/R in Amperes |
| Answer» E. | |
| 113. |
If an ammeter is to be used in place of a voltmeter, we must connect with the ammeter a |
| A. | High resistance in parallel |
| B. | High resistance in series |
| C. | Low resistance in parallel |
| D. | Low resistance in series |
| Answer» C. Low resistance in parallel | |
| 114. |
An electric heater is used on a 220V supply and it takes a current of 2A. How much power does it consume? |
| A. | 550 W |
| B. | 440 W |
| C. | 400 W |
| D. | 450 W |
| Answer» C. 400 W | |
| 115. |
In a circuit, voltmeter is always connected in ______? |
| A. | Parallel |
| B. | Series |
| C. | Triangular |
| D. | Either series or parallel |
| Answer» B. Series | |
| 116. |
12 V battery has how many plates |
| A. | 15, 17, 19, 27 |
| B. | 27, 28, 29, 30 |
| C. | 7, 9, 11, 17 |
| D. | 30, 31, 32, 33 |
| Answer» D. 30, 31, 32, 33 | |
| 117. |
A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is: (E is mid-point of arm CD) |
| A. | R |
| B. | \(\left( {\frac{7}{{64}}} \right)\) |
| C. | \(\left( {\frac{3}{4}} \right)\)R |
| D. | \(\left( {\frac{1}{16}} \right)\)R |
| Answer» C. \(\left( {\frac{3}{4}} \right)\)R | |
| 118. |
A wire has a resistance of 16 ohms. It is melted and drawn into a wire of half of its original length. What is the resistance of the new wire? |
| A. | 4 ohms |
| B. | 32 ohms |
| C. | 16 ohms |
| D. | 8 ohms |
| Answer» B. 32 ohms | |
| 119. |
Consider the following circuit:The equivalent resistance of the circuit will be |
| A. | 12 Ω |
| B. | \(9\frac{{11}}{{12}}\Omega \) |
| C. | \(9\frac{1}{{11}}\Omega \) |
| D. | \(\frac{{24}}{{25}}\Omega \) |
| Answer» D. \(\frac{{24}}{{25}}\Omega \) | |
| 120. |
A given conductor carrying a current of 1 A produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, the amount of heat produced will be |
| A. | 2000 J |
| B. | 4000 J |
| C. | 8000 J |
| D. | 1000 J |
| Answer» D. 1000 J | |
| 121. |
If the effective resistance is 6 kΩ and one of the two resistors connected in parallel is 8 kΩ then find the value of the other resistor (in kΩ). |
| A. | 12 |
| B. | 24 |
| C. | 16 |
| D. | 48 |
| Answer» C. 16 | |
| 122. |
For which of the following materials, the resistance decreases on increasing the temperature? |
| A. | Copper |
| B. | Tungsten |
| C. | Germanium |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 123. |
Four cells of emf 1.5 V each are connected in parallel combination of cells. Then the output voltage of the parallel combination is |
| A. | 4.0 V |
| B. | 1.5 V |
| C. | 6.0 V |
| D. | 2.5 V |
| Answer» C. 6.0 V | |
| 124. |
A wire of length 10 cm has resistance 12Ω. It is bent in the form of a circle. The effective resistance between the two points of its diameter is equal to |
| A. | 12Ω |
| B. | 6Ω |
| C. | 3Ω |
| D. | 24Ω |
| Answer» D. 24Ω | |
| 125. |
If the length of a resistance wire is doubled and its cross-sectional area is halved, then the resistivity would |
| A. | increase two times |
| B. | increase four times |
| C. | increase eight times |
| D. | remain unchanged |
| Answer» E. | |
| 126. |
If the LED is not glowing in the following circuit, what is the value of R? |
| A. | 7 Ω |
| B. | 4 Ω |
| C. | 3 Ω |
| D. | 5 Ω |
| Answer» B. 4 Ω | |
| 127. |
Electric bulbs are usually filled with chemically inactive ______ gases |
| A. | Nitrogen and carbon monoxide |
| B. | Nitrogen and oxygen |
| C. | Nitrogen and argon |
| D. | Nitrogen and carbon dioxide |
| Answer» D. Nitrogen and carbon dioxide | |
| 128. |
A conducting wire of uniform diameter was made from a piece of copper. If l and d are taken as the symbols of length and diameter of the wire respectively then for which l and d given below the resistance of the wire would be minimum? |
| A. | l, d |
| B. | 2l, d |
| C. | l/2, 2d |
| D. | 2l , d/2 |
| Answer» D. 2l , d/2 | |
| 129. |
A resistance is measured by a voltmeter-ammeter method using DC excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter are subject to maximum error of ± 2.4% and ± 1.0% respectively, then the magnitude of maximum error in the value of resistance obtained from the measurement is nearly |
| A. | 1.4% |
| B. | 1.7% |
| C. | 2.4% |
| D. | 3.4% |
| Answer» E. | |
| 130. |
In the equation E = jρ, where 'j' is the current density and 'E' is magnitude of uniform electric field in a conductor, then 'ρ' represents ___________. |
| A. | permittivity |
| B. | resistivity |
| C. | permeability |
| D. | conductivity |
| Answer» E. | |
| 131. |
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 Ω/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. | 0.50 V |
| B. | 0.75 V |
| C. | 0.25 V |
| D. | 0.20 V |
| Answer» D. 0.20 V | |
| 132. |
If two resistors of 10 kΩ and 30 kΩ are connected in parallel what will be the value of the effective resistance (in kΩ)? |
| A. | 10 |
| B. | 12.5 |
| C. | 7.5 |
| D. | 5 |
| Answer» D. 5 | |
| 133. |
Find the effective resistance between A and B in the given Fig. |
| A. | 9.82 Ω |
| B. | 7.82 Ω |
| C. | 5.82 Ω |
| D. | 3.82 Ω |
| Answer» B. 7.82 Ω | |
| 134. |
Kirchoffs first rule of any junction of several circuit element in an electric circuit is based on the law of conservation of: |
| A. | Mass |
| B. | Charge |
| C. | Linear momentum |
| D. | Energy |
| Answer» C. Linear momentum | |
| 135. |
A uniform wire of resistance 9Ω is bent in the form of an equilateral triangle. Find the effective resistance across a side of the triangle. |
| A. | \(\frac{1}{3}{\rm{\Omega }}\) |
| B. | 27 Ω |
| C. | 2 Ω |
| D. | 3 Ω |
| Answer» D. 3 Ω | |
| 136. |
A wire 1.2 mm in diameter and 32 cm long, carries a current of 648 mA. The density of free electrons in the wire is 5.90 × 1028 m-3. The drift velocity of electrons in the wire is: |
| A. | 3.2 × 10-5 m/s |
| B. | 6.1 × 10-5 m/s |
| C. | 1.8 × 10-4 m/s |
| D. | 3.6 × 10-4 m/s |
| Answer» C. 1.8 × 10-4 m/s | |
| 137. |
In an incandescent electric bulb, the filament of the bulb is made up of which metal? |
| A. | Aluminium |
| B. | Copper |
| C. | Tungsten |
| D. | Silver |
| Answer» D. Silver | |
| 138. |
A heater element is made of nichrome wire having resistivity equal to 100 × 10-8 Ωm and a diameter of 0.4 mm. The length of the wire required to get a resistance of 40 Ω will be nearly |
| A. | 9 m |
| B. | 7 m |
| C. | 5 m |
| D. | 3 m |
| Answer» D. 3 m | |
| 139. |
A resistor has the following 4 color bands (in this order): yellow, yellow, brown and gold, Its nominal value is: |
| A. | 440 Ω ± 10% |
| B. | 4.4 k Ω ± 5% |
| C. | 4.4 k ohm ± 10% |
| D. | 440 Ω ± 5% |
| Answer» E. | |
| 140. |
A battery converts _____ energy to electrical energy. |
| A. | light |
| B. | heat |
| C. | chemical |
| D. | mechanical |
| Answer» D. mechanical | |
| 141. |
If a wire of resistance R is melted and recast to half its length then what will be the new resistance of the wire? |
| A. | R |
| B. | R/2 |
| C. | R/4 |
| D. | >2R |
| Answer» D. >2R | |
| 142. |
A galvanometer can be converted into an voltmeter by connecting |
| A. | Low resistance in series |
| B. | High resistance in parallel |
| C. | Low resistance in parallel |
| D. | High resistance in series |
| Answer» E. | |
| 143. |
Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners? |
| A. | 3/2 Q |
| B. | 6 Q |
| C. | 4 Q |
| D. | 8/3 Q |
| Answer» D. 8/3 Q | |
| 144. |
Resistance of a tungsten lamp as applied voltage increases |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | None of the above |
| Answer» C. Remains same | |
| 145. |
Two resistors are said to be connected in series when |
| A. | Same current passes in turn through both |
| B. | Both carry the same value of current |
| C. | Total current equals the sum of branch currents |
| D. | Sum of IR drops equals the applied e.m.f. |
| Answer» B. Both carry the same value of current | |
| 146. |
When one leg of parallel circuit is opened out the total current will |
| A. | Reduce |
| B. | Increase |
| C. | Decrease |
| D. | Become zero |
| Answer» D. Become zero | |
| 147. |
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be |
| A. | 1 Q |
| B. | 2 Q |
| C. | 3 Q |
| D. | 4 Q |
| Answer» E. | |
| 148. |
Resistance of carbon filament lamp as the applied voltage increases. |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | None of the above |
| Answer» C. Remains same | |
| 149. |
Heat in a conductor is produced on the passage of electric current due to |
| A. | reactance |
| B. | capacitance |
| C. | impedance |
| D. | resistance |
| Answer» E. | |
| 150. |
Which is the best conductor of electricity? |
| A. | Iron |
| B. | Silver |
| C. | Copper |
| D. | Carbon |
| Answer» C. Copper | |