1:   In an electric heater the current is dropped by 20%.By what percent the heat energy is dropped
Options:
  1. 18%
  2. 36%
  3. 18%
  4. 40%

Answer: Option 2

Explanation:

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2:   In a primary cell current is provided due to the conversion of
Options:
  1. heat energy into electrical energy
  2. electrical energy into heat energy
  3. electrical energy into chemical energy
  4. none of the above

Answer: Option 3

Explanation:

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3:   A 10 V storage battery of negligible internal resistance is connected to a 50 ohm resistor.The amount of heat energy produced in one hour is
Options:
  1. 1600J
  2. 720J
  3. 3200J
  4. 7200J

Answer: Option 4

Explanation:

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4:   In strong electrolytes the electrolytes are -------- in their solutions
Options:
  1. not ionised
  2. partially ionised
  3. completely ionised
  4. feebly ionised

Answer: Option 3

Explanation:

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5:   What is the minimum number of bulbs each marked 60 W,40V that can work safety when connected in series with a 240 V supply
Options:
  1. 4
  2. 8
  3. 6
  4. 7

Answer: Option 3

Explanation:

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6:   Which of the following is immaterial for a fuse wire?
Options:
  1. length
  2. current
  3. both of the above
  4. resistance

Answer: Option 4

Explanation:

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7:   The production of e.m.f by maintaining a difference of temperature between the two junction of dissimilar metal is called -------
Options:
  1. Joule effect
  2. Thomson effect
  3. Seebeck effect
  4. Peltier effect

Answer: Option 3

Explanation:

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8:   A 220 V ,100 W bulb is connected to a 110 V source.The power consumed by the bulb is -------
Options:
  1. 100 W
  2. 10 W
  3. 25 W
  4. 50 W

Answer: Option 3

Explanation:

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9:   What is the power output of a 1.5 V ideal battery which is delivering a current of 0.3 A?
Options:
  1. 45 W
  2. 0.3 W
  3. 30 W
  4. 4.5 W

Answer: Option 2

Explanation:

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10:   Two electric bulbs whose resistance are in the ratio 1:2 are connected in parallel to a constant voltage source.The powers dissipated in them have the ratio ---------
Options:
  1. 2:1
  2. 1:1
  3. 1:4
  4. 4:1

Answer: Option 1

Explanation:

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