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Electricity

10th Class - CBSE - Physics - 2531 Questions - 0 Concepts

Important Questions

Q1 Single Correct Medium
Current-voltage characteristics of two elements $$A$$ and $$B$$ are shown in figure (i) and (ii) respectively.
Which of the following graphs represents current-voltage characteristics for their series combination?
  • A.
  • B.
  • C.
  • D.

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Q2 Single Correct Medium
A letter 'A' is constructed of a uniform wire of resistance $$1  ohm/cm$$. The sides of the letter are $$20  cm$$ long and the cross piece in the middle is $$10  cm$$ long while the vertex angle is $$60^{o}$$. The resistance of the letter between the two ends of the legs is:
  • A. $$\dfrac{40}{3}\Omega $$
  • B. $$40  \Omega $$
  • C. $$10  \Omega $$
  • D. $$\dfrac{80}{3}\Omega $$

Asked in: Physics - Electricity


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Q3 Single Correct Medium
Appliances based on heating effect of current work on
  • A. only A.C.
  • B. only D.C.
  • C. both A.C. and D.C.
  • D. none of these

Asked in: Physics - Electricity


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Q4 Single Correct Medium
Using three wires of resistances 1 ohm, 2ohm and 3 ohm, number of different possible values of resistances are:

  • A.  6
  • B.  4
  • C.  10
  • D.  8

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Q5 Single Correct Hard
A material $$B$$ has twice the specific resistance of $$A$$. A circular wire made of $$B$$ has twice the diameter of a wire made of $$A$$. Then for the two wires to have the same resistance, the ratio $$l_{B} $$ / $$l_{A}$$ of their respective lengths must be:
  • A. 1
  • B. 1/2
  • C. 1/4
  • D. 2

Asked in: Physics - Electricity


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Q6 Subjective Hard
In the circuit shown all five resistors have the same value $$200\ \Omega$$ and each cell has an emf $$3\ volts.$$ Find the open circuit voltage and the short circuit current for the terminals $$A$$ and $$B.$$

Asked in: Physics - Electricity


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Q7 Single Correct Hard
Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC=2a. D and E are the midpoints of BC and CA, as shown in the figure. The work done in taking a charge Q from D to E is
  • A. $$\dfrac { qQ }{ 8\pi { \varepsilon }_{ 0 }a }$$
  • B. $$\dfrac { qQ }{ 4\pi { \varepsilon }_{ 0 }a } $$
  • C. $$\dfrac { 3qQ }{ 4\pi { \varepsilon }_{ 0 }a }$$
  • D. zero

Asked in: Physics - Electricity


1 Verified Answer | Published on 07th 09, 2020

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Q8 Single Correct Hard
The arc AB with the centre C and the infinitely long wire having linear charge density $$\lambda $$ are lying in the same plane. The minimum amount of work to be done to move a point charge $${q_0}$$ from point A to B through a circular path AB of radius $$a$$ is equal to:
  • A. $$\dfrac{{q_0^2}}{{2\pi {\varepsilon _0}}}\log \left( {\dfrac{2}{3}} \right)$$
  • B. $$\dfrac{{{q_0}\lambda }}{{2\pi {\varepsilon _0}}}\log \left( {\dfrac{2}{3}} \right)$$
  • C. $$\dfrac{{{q_0}\lambda }}{{\sqrt 2 \pi {\varepsilon _0}}}$$
  • D. $$\dfrac{{{q_0}\lambda }}{{2\pi {\varepsilon _0}}}\log \left( {\dfrac{3}{2}} \right)$$

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Q9 Single Correct Hard
Two resistance $$R_1 = 100 \pm 3 \omega$$ and $$R_2 = 200 \pm 4\omega$$ are connected in series. Find the equivalent resistance of the series combination.
  • A. $$300 \pm  8 $$ omega
  • B. $$600 \pm 7$$ omega
  • C. $$300 \pm 6$$ omega
  • D. $$300 \pm 7$$ omega

Asked in: Physics - Electricity


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Q10 Single Correct Medium
A wire of resistance $$20\Omega $$ is bent in the form of a square. The resistance between the ends of diagonal is:

  • A. $$10\Omega $$
  • B. $$20\Omega $$
  • C. $$15\Omega $$
  • D. $$5\Omega $$

Asked in: Physics - Electricity


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Questions 122475
Subjects 10
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