21. Consider the following statements.
1. Ohm's law is not applicable at very low and very high temperature.
2. Ohm's law is applicable to semiconductor.
3. Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes.
4. Conductance is the reciprocal of resistance and ismeasured in siemens.
Which of the statements given above are correct?
1. Ohm's law is not applicable at very low and very high temperature.
2. Ohm's law is applicable to semiconductor.
3. Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes.
4. Conductance is the reciprocal of resistance and ismeasured in siemens.
Which of the statements given above are correct?
22. Which of the following statement(s) is/are correct?
23. Which of the following has low resistivity?
24. What is the resistivity of insulators?
25. An electric current of 0.75A flows in a filament of an electric bulb for 10 minutes. Find the amount of electric charge flowing through the current.
26. A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?
27. Consider the following statements regarding a motor car battery.
1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in amperehour.
Which of the above statements are correct?
1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in amperehour.
Which of the above statements are correct?
28. Which of the following gases is used to fill an electric bulb?
29. Assertion (A) The ferromagnetic substances do not obey Curie's law.
Reason (R) At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
Reason (R) At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
30. The value of resistance of an absolute ammeter should be:
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