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Current Electricity MCQs for NEET — Physics Questions with Answers

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Assertion and reason type question: Assertion and reason are given in following questions each question has four options one of them is correct select it. Assertion: A potentiometer of longer length is used for accurate measurement. Reason: The potential gardient for a potentiometer of longer length with a given source of e.m.f become small.

A. Both assertion and reason are true and the reason is correct explanation of the assertion. B. Both assertion and reason are true, but reason is not correct explanation of the assertion. C. Assertion is true, but the reason is false. D. Both, assertion and reason are false

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Explanation

A potentiometer is a device used for measuring the potential difference accurately. A longer length potentiometer wire allows for a smaller potential gradient, which makes the measurements more accurate. Thus, the assertion that a potentiometer of longer length is used for accurate measurement is true, and the reason that a longer length results in a smaller potential gradient is also true and correctly explains the assertion.

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Assertion and reason type question: Assertion and reason are given in following questions each question has four options one of them is correct select it. Assertion: The 200w bulbs glow with more brightness than 100w bulbs. Reason: A 100w bulb has more resistance than a 200w bulb.

A. Both assertion and reason are true and the reason is correct explanation of the assertion. B. Both assertion and reason are true, but reason is not correct explanation of the assertion. C. Assertion is true, but the reason is false. D. Both, assertion and reason are false

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Explanation

A 200W bulb glows with more brightness than a 100W bulb because it consumes more power. The reason given is that a 100W bulb has more resistance than a 200W bulb, which is also true. According to the formula P = V^2 / R, for the same voltage, the bulb with higher power (200W) will have lower resistance than the bulb with lower power (100W). Therefore, both the assertion and the reason are true, and the reason correctly explains the assertion.

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Assertion and reason type question: Assertion and reason are given in following questions each question has four options one of them is correct select it. Assertion: Aseries combination of cells is used when their internal resistance is much smaller than the external resistance. Reason: It follows from the relation $I = {nE \over R+n} $ Where the symbols have their standard meaning.

A. Both assertion and reason are true and the reason is correct explanation of the assertion. B. Both assertion and reason are true, but reason is not correct explanation of the assertion. C. Assertion is true, but the reason is false. D. Both, assertion and reason are false

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Explanation

Both assertion and reason are true, and the reason correctly explains the assertion. In a series combination of cells, the total internal resistance is the sum of all the internal resistances, which is small compared to the external resistance. The given current equation $I = \frac{nE}{R+n}$ (where $n$ is the number of cells, $E$ is the emf of each cell, $R$ is the external resistance, and $n$ is the total internal resistance) shows that the current is primarily dependent on the external resistance when internal resistance is much smaller.

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Assertion and reason type question: Assertion and reason are given in following questions each question has four options one of them is correct select it. Assertion: In balanced standard wheastone bridge, $ R_AC ={(P + Q) (R + S) \over (P + Q + R + S)}$ Reason: This is because B and D are at the same potential.

A. Both assertion and reason are true and the reason is correct explanation of the assertion. B. Both assertion and reason are true, but reason is not correct explanation of the assertion. C. Assertion is true, but the reason is false. D. Both, assertion and reason are false

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In a simple metre-bridge circuit, the both gaps are bridge by coils P and Q having the smaller resistance. A balance is obtained when the jockey key makes contact at a point of the bridge wire 40 cm from the P end. On shunting the coil Q with a resistance of $50\Omega $ the balance point is moved through 10 cm. What are the resistance of P and Q ?

A. $ {100 \over 3 } \Omega , {100 \over 2 } \Omega respectively $ B. $ {50 \over 3 } \Omega , {50 \over 2 } \Omega respectively $ C. $ {25 \over 3 } \Omega , {25 \over 2 } \Omega respectively $ D. $ {75 \over 3 } \Omega , {75 \over 2 } \Omega respectively $

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Explanation

Case 1 : P/40 = Q /40 ....(1) On shunting Q with 50 ï— the resistance of the armcontaining Q comesdown, so length also must shorten to keep the ratio same. $ \Rightarrow { P \over (40 + 10 ) } = { \left( 50 Q \over 50+Q \right) \over (60 -10) } \Rightarrow P = { 50 \over 50+Q } $....(2) Solving (1) and (2) we get $ P = {50 \over 3 } \Omega and { 50 \over 2 } \Omega $

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What is the resistance of an open key ?

A. $ \infty $ B. Can't be determined C. 0 D. depends on the other resistances in the circuit

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Explanation

$ R = {V \over I } i.e. I = 0 \Rightarrow R = infinite $

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What is the unit of temperature coefficient of resistance ?

A. $ \Omega ^{-1} {^\circ }C$ B. $ \Omega ^{1} {^\circ } C^{-1}$ C. $ ^\circ C^{-1} $ D. $ \Omega ^{0} ^\circ C^{-1} $

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Explanation

Knowledge base

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Which one of the following is not Ohm's law ? (J = current density, E = Electric field, $ \rho $ = resistivity and $ \sigma $ conductivity)

A. $ J = \sigma E $ B. $ J = \rho E $ C. I = V /R D. $ E = \rho J $

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Explanation

I = V / R is obviously Ohm's law. $ \Rightarrow = \sigma E $ is still another form for Ohm's law.

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The external resistance of a circuit is $ \eta $ times higher than the internal resistance of the source. The ratio ofthe potential difference across the terminals of the source to its emf is...........

A. $ { \eta -1 \over \eta} $ B. $ { 1 \over \eta} $ C. $ { \eta \over 1+ \eta} $ D. $ { \eta } $

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Explanation

$ R = \eta .r , V = IR ,\epsilon = I (R + r ) $

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A wire has resistance $R_O$, What will its resistance if it is stretched to double, What is its length ?

A. 4 R0 B. 3R0 C. R0 D. 2R0

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Explanation

$ R \alpha (n) l $

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