InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
An electric bulb, marked `40 W` and `200 V`, is used in a circuit of supply voltage `100 V`. Now its power isA. 100 WB. 40 WC. 20 WD. 10 W |
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Answer» Correct Answer - D |
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| 102. |
n identical bulbs, each designed to draw a power p from a certain voltage supply, are joined in series across that supply. The total power which they will draw isA. `p//n^(2)`B. p/nC. pD. np |
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Answer» Correct Answer - B |
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| 103. |
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?A. `400 Omega`B. `200 Omega`C. `40 Omega`D. `20 Omega` |
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Answer» Correct Answer - C |
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| 104. |
A certain charge liberates `0.8` gm of `O_(2)` . The same charge will liberate how many gm of silverA. 108 gmB. `10.8 gm`C. `0.8 gm`D. `(108)/(0.8)gm` |
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Answer» Correct Answer - B |
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| 105. |
In charging a battery of motor-car, the following effect of electric current is usedA. MagneticB. HeatingC. ChemicalD. Induction |
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Answer» Correct Answer - C |
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| 106. |
Antimony and bismuth are usually used in a thermocouple, becauseA. Negative thermal e.m.f. producedB. Constant thermal e.m.f. producedC. Lower thermal e.m.f. producedD. Higher thermal e.m.f. produced |
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Answer» Correct Answer - D |
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| 107. |
Above neutral temperature, thermo e.m.f. in a thermocoupleA. Decreases with rise in temperatureB. Increases with rise in temperatureC. Remains constantD. Changes sign |
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Answer» Correct Answer - A |
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| 108. |
Consider the following two statements A and B , and identify the correct choice out of given answers A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit.A. A is false and B is trueB. A is true and B is falseC. Both A and B are falseD. Both A and B are true |
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Answer» Correct Answer - A |
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| 109. |
In Cu - Fe couple, the flow of current at the temperature of inversion isA. From Fe to Cu through the hot junctionB. From Cu to Fe through the hot junctionC. MaximumD. None of the above |
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Answer» Correct Answer - A |
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| 110. |
For a thermocouple, the temperature of inversion is that temperature at which thermo e.m.f. isA. ZeroB. MaximumC. MinimumD. None of the above |
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Answer» Correct Answer - A |
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| 111. |
If `E=at+bt^(2)`, what is the temperature of inversionA. `-(a)/(2b)`B. `+(a)/(2b)`C. `-(a)/(b)`D. `+(a)/(b)` |
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Answer» Correct Answer - A |
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| 112. |
Consider the following two statements A and B and identify the correct choice given in the answers (A) Duddells thermo-galvanometer is suitable to measure direct current only (B) Thermopile can measure temperature differences of the order of `10^(-3).^(@)C`A. Both A and B are trueB. Both A and B are falseC. A is true but B is falseD. A is false but B is true |
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Answer» Correct Answer - D |
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| 113. |
The amount of substance liberated on electrodes during electrolysis when 1 coulomb of electricity is passed, isA. Chemical equivalentB. Electrochemical equivalentC. Equivalent weightD. One mol |
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Answer» Correct Answer - B |
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| 114. |
The electrochemical equivalent of a metal is `3.35109^(-7)` kg per Coulomb. The mass of the metal liberated at the cathode when a 3A current is passed for 2 seconds will beA. `19.8xx10^(-7)kg`B. `9.39xx10^(-7)kg`C. `6.6xx10^(-7)kg`D. `1.1xx10^(-7)kg` |
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Answer» Correct Answer - A |
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| 115. |
On passing 96500 coulomb of charge through a solution `CuSO_(4)` the amount of copper liberated isA. 64 gmB. 32 gmC. 32 kgD. 64 kg |
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Answer» Correct Answer - B |
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| 116. |
If 96500 coulombs of electricity liberates one gram equivalent of any substance, the time taken for a current of `0.15` amperes to deposite 20 mg of copper from a solution of copper sulphate is (Chemical equivalent of copper = 32)A. 5 min 20 secB. 6 min 42 secC. 4 min 40 secD. 5 min 50 sec |
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Answer» Correct Answer - B |
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| 117. |
The negative Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electeochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive. Cu pole in this time isA. `0.242 g`B. `0.190 g`C. `0.141 g`D. `0.126 g` |
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Answer» Correct Answer - D |
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| 118. |
when a copper votameter is connected with a battery of emf `12V,2g` of copper is deposite in `30` min. if the same voltmeter is connected across a `6V` battery then the mass of copper deposite in `45` min would beA. 1 gmB. `1.5 gm`C. 2 gmD. `2.5 gm` |
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Answer» Correct Answer - B |
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| 119. |
An electric bulb rated for `500 W` at `100 V` is used in a circuit having a `200 V` supply. The reistance `R` that must be put in series with bulb, so that the bulb delivers `500 `W is ……….`Omega`.A. `10 Omega`B. `20 Omega`C. `50 Omega`D. `100 Omega` |
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Answer» Correct Answer - B |
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| 120. |
The heat generated through 2 ohm and 8 ohm resistances separately, when a condenser of `200 mu F`capacity charged to 200V is discharged one by one, will beA. 4 J and 16 J respectivelyB. 16 J and 4 J respectivelyC. 4 J and 8 J respectivelyD. 4 J and 4 J respectively |
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Answer» Correct Answer - D |
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| 121. |
If two wires having resistance R and 2 R . Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,A. `2 : 1`B. `1 : 2`C. `2 : 9`D. `9 : 2` |
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Answer» Correct Answer - C |
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| 122. |
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 beA. `4.35` calB. `5.73` calC. `7.5` calD. `2.5` cal |
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Answer» Correct Answer - C |
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| 123. |
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 A. X will glow brighterB. Resistance of Y is greater than XC. Heat produced in Y will be greater than XD. Voltage drop in X will be greater than Y |
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Answer» Correct Answer - A |
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| 124. |
The heat produced by a 100 watt heater in 2 minute will be equal toA. `12xx10^(3)J`B. `10xx10^(3)J`C. `6xx10^(3)J`D. `3xx10^(3)J` |
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Answer» Correct Answer - A |
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| 125. |
Which of the following is not equal to watt?A. `(Amp)^(2)xx ohm`B. Amp / VoltC. Amp `xx` VoltD. Joule / sec |
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Answer» Correct Answer - B |
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| 126. |
Two wires with resistances R and 2 R are connected in parallel, the ratio of heat generated in 2 R and R isA. `1 : 2`B. `2 : 1`C. `1 : 4`D. `4 : 1` |
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Answer» Correct Answer - A |
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| 127. |
Watt - hour meter measuresA. Electric energyB. CurrentC. VoltageD. Power |
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Answer» Correct Answer - A |
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| 128. |
If the emf of a thermocouple, one junction of which is kep `0^(@)C` is given by `e=at+1//2bt^(2)` then the neutral temperature will beA. a/bB. `-a//b`C. `a//2b`D. `-1//ab` |
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Answer» Correct Answer - B |
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| 129. |
A `25 W, 220 V` bulb and a `100 W , 220 V` bulb are connected in series across a `220 V` line , which electric bulb will glow brightly?A. 25 watt bulbB. 100 watt bulbC. First 25 watt and then 100 wattD. Both with same brightness |
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Answer» Correct Answer - A |
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| 130. |
Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will beA. 20 wattB. 60 wattC. 80 wattD. 100 watt |
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Answer» Correct Answer - C |
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| 131. |
A 25 W , 220 V bulb and a 100 W , 220 V bulb are connected in parallel across a 440 V lineA. Only 100 watt bulb will fuseB. Only 25 watt bulb will fuseC. Both bulbs will fuseD. None of the bulbs will fuse |
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Answer» Correct Answer - C |
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