Ohm's law, circuits, heating effectPractice Questions & MCQs
Practice Ohm's law, circuits, heating effect questions from Electricity (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Ohm's law, circuits, heating effectQuiz - Solve & Score
Q1. Two bulbs marked 60 W, 220 V and 100 W, 220 V are connected in series across 220 V supply. Which bulb glows brighter?
- A.The 60 W bulb glows brighter
- B.The 100 W bulb glows brighter
- C.Both glow equally
- D.Neither glows
Answer: A. The 60 W bulb glows brighter
Q2. Two bulbs 100 W and 60 W rated 220 V are connected in SERIES to 220 V. Which glows brighter?
- A.The 60 W bulb
- B.The 100 W bulb
- C.Both equal
- D.Neither lights
Answer: A. The 60 W bulb
Given 100 W, 60 W, 220 V, asked for the unknown. By R = V²/P, so R_60 > R_100 (60 W bulb has higher resistance). R = V²/P, so R_60 > R_100 (60 W bulb has higher resistance). So 60 W bulb glows brighter in series - opposite of intuition. Consequently option A) The 60 W bulb.
Q3. An MCB (miniature circuit breaker) rated 10 A is installed. The circuit currently draws 8 A. If a 2.5 kW appliance is added on the same circuit (220 V), what happens?
- A.MCB trips because total exceeds 10 A
- B.Nothing, since 10 A is exceeded only at 12 A
- C.Appliance receives reduced voltage
- D.Fuse blows; MCB never trips
Answer: A. MCB trips because total exceeds 10 A
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