| 1 |
A charged conductor has charge on its. |
- A. Inner surface
- B. Outer surface
- C. Middle surface
- D. Surrounding space
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| 2 |
The current through a resistance of 100 Ohm when connecting across a source of 220 V is. |
- A. 22000 A
- B. 22 A
- C. 2.2 A
- D. 0.45 A
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| 3 |
A rheostat can operate as. |
- A. Amplifier
- B. Potential divider
- C. Oscillator
- D. Transformer
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| 4 |
Magnetic effect of current is used |
- A. To detect a current
- B. To measure a current
- C. In electric motor
- D. All of above
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| 5 |
The condition for the wheatstone bridge to be balanced is given by |
- A.
- B.
- C.
- D. None of above
|
| 6 |
Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is: |
- A. 3Ω
- B. 4Ω
- C. 4.5Ω
- D. 5Ω
|
| 7 |
The algebraic sum of potential change in a closed circuit is zero. |
- A. Kirchhoff's 1st rule
- B. Kirchhoff 2<sup>nd</sup> rule
- C. Krichoff's 3<sup>rd</sup> rule
- D. Kirchhoff 4<sup>th</sup> rule
|
| 8 |
When a wire is stretched and its radius becomes r/2, then its resistance will be |
- A. 16 R
- B. 4 R
- C. 2R
- D. 0
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| 9 |
The unit of conductivity is: |
- A. Ohm<sup>-3</sup>m<sup>-1</sup>
- B. Ohm m<sup>-1</sup>
- C. Both a and b
- D. Ohm m<sup>-1</sup>
|
| 10 |
The free electrons experience force. |
- A. In direction of -E
- B. In direction of E
- C. Both A and B
- D. All of the above
|