Download Test Paper No. 15 (Physics)

TEST NO. 15
MAXIMUM MARKS : 20
1. State the principle of a moving coil galvanometer.
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2. What is the nature of magnetic field in a moving coil galvanometer?
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3. What is the importance of radial magnetic field in a moving coil
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galvanometer?
4. When a galvanometer is said to be sensitive?
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5. Define current sensitivity and voltage sensitivity of a galvanometer.
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6. How can we increase the sensitivity of a galvanometer?
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7. You are given a low resistance R1, a high resistance R2 and a
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moving coil galvanometer. Suggest how would you use these to
have an instrument that will be able to measure current and potential
difference.
8. What is shunt? Write its SI unit.
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9. State two properties of the material of the wire used for suspension
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of the coil in a moving coil galvanometer.
10. A galvanometer of coil resistance 20 ohm gives full scale deflection
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for a current of 20 mA. How it can be converted into a voltmeter of
range 0 – 10V?
11. A galvanometer of coil resistance 25 ohm gives full scale deflection
for a current of 50 μA. How it can be converted into a ammeter of
range 0 – 5A?
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