Current Electricity Test

Result

Current Electricity Test - 71

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Weekly Quiz Competition

Question 1
4 / -1

Two conductors have the same resistance at 0°C but their temperature coefficients of resistance are α₁ and α₂. The respective temperature coefficients of their series and parallel combinations are nearly

A

B

C

D

Solution
Question 2
4 / -1

Variation of current passing through a conductor as the voltage applied across its ends is varied as shown in the adjoining diagram. If the resistance (R) is determined at the points A, B, C and D, we will find that

A
R_C = R_D

B
R_B > R_A

C
R_C > R_B

D
None of these

Solution
Question 3
4 / -1

The voltage V and current I graph for a conductor at two different temperatures T₁ and T₂ are shown in the figure. The relation between T₁ and T₂ is

A
T₁>T₂

B
T₁ ≈ T₂

C
T₁ = T₂

D
T₁< T₂

Solution
Question 4
4 / -1

From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance

A
AB

B
BC

C
CD

D
DE
Question 5
4 / -1

I–V characteristic of a copper wire of length L and area of cross-section A is shown in figure. The slope of the curve becomes

A
More if the experiment is performed at higher temperature

B
More if a wire of steel of same dimension is used

C
More if the length of the wire is increased

D
Less if the length of the wire is increased

Solution
Question 6
4 / -1

E denotes electric field in a uniform conductor, I corresponding current through it, v_d drift velocity of electrons and P denotes thermal power produced in the conductor, then which of the following graph is incorrect?

A

B

C

D

Solution
Question 7
4 / -1

The two ends of a uniform conductor are joined to a cell of e.m.f. E and some internal resistance. Starting from the midpoint P of the conductor, we move in the direction of current and return to P. The potential Vat every point on the path is plotted against the distance covered (x). Which of the following graphs best represents the resulting curve?

A

B

C

D
Question 8
4 / -1

The resistance R₁ of a conductor varies with temperature t as shown in the figure. If the variation is represented by R₁ = R₀ [1 = αt + βt²]

A
α and β are both negative

B
α and β are both positive

C
α is positive and β is negative

D
α is negative and β is positive

Solution
Question 9
4 / -1

Variation of current and voltage in a conductor has been shown in the diagram below. The resistance of the conductor is.

A
4 Ω

B
2 Ω

C
3 Ω

D
1 Ω

Solution
Question 10
4 / -1

Resistance as shown in figure is negative at

A
A

B
B

C
C

D
None of these