| 1 |
<p class="MsoNormal">If a ray of light in glass is incident on an air surface at
an angle greater than the critical angle, the ray will:<o:p></o:p></p> |
- A. <p class="MsoNormal">Refract only<o:p></o:p></p>
- B. <p class="MsoNormal">Reflect only<o:p></o:p></p>
- C. <p class="MsoNormal">Partially refract and partially reflect<o:p></o:p></p>
- D. <p class="MsoNormal">Diffract only<o:p></o:p></p>
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| 2 |
What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A? |
- A. 4.8 W
- B. 14.5 W
- C. 30 W
- D. 60 W
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| 3 |
The rate of flow of charge through any cross-sectional area is called: |
- A. potential difference
- B. Energy
- C. Coulomb
- D. Electric current
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| 4 |
The S.I unit of potential difference is: |
- A. Ampere
- B. Coulomb
- C. Volt
- D. Watt
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| 5 |
An electric current in conductors is due to the flow of: |
- A. Positive ions
- B. Negtive ions
- C. Positive charge
- D. free electron
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| 6 |
<p class="MsoNormal">The more negative potential of grid, the more electrons will
be:<o:p></o:p></p> |
- A. <p class="MsoNormal">Attracted<o:p></o:p></p>
- B. <p class="MsoNormal">Repelled<o:p></o:p></p>
- C. <p class="MsoNormal">Attracted as well as repelled<o:p></o:p></p>
- D. <p class="MsoNormal">Neither attracted nor repelled<o:p></o:p></p>
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| 7 |
What is the voltage across a 6Ω resistor when 3 A of current passes through it? |
- A. 2 V
- B. 9 V
- C. 18 V
- D. 36 V
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| 8 |
The unit of (ρ) in formula R=ρ.L/a is______________. |
- A. Ω
- B. Ω-m
- C. Ω-m<sup>2</sup>
- D. Ω-m<sup>-2</sup>
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| 9 |
Which instrument measures the potential difference: |
- A. Voltmeter
- B. Barometer
- C. Galvanometer
- D. Ammeter
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| 10 |
The equivalent resistance in parallel combination is: |
- A. R<sub>c</sub>=R<sub>1</sub>+R<sub>2</sub>+R<sub>3</sub> +.................+R<sub>n</sub>
- B. R<sub>c</sub>=1/R<sub>1</sub>+1/R<sub>2</sub>+1/R<sub>3</sub>+.................+1/R<sub>n</sub>
- C. a and b
- D. None of these
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