Electromagnets | MCQs

    Q1: Which of the following is the main characteristic of electromagnets that makes them useful in cranes and doorbells?

    مندرجہ ذیل میں سے کون سی برقی مقناطیس کی اہم خصوصیت ہے جو انہیں کرینوں اور دروازے کی گھنٹیوں میں کارآمد بناتی ہے؟
    • A. They are very strong
    • B. They can be switched on and off
    • C. They are permanent
    • D. They are very heavy

    Q2: Which of the following is the main difference between electromagnets and bar magnets?

    مندرجہ ذیل میں سے کون سا برقی مقناطیس اور بار میگنےٹ کے درمیان بنیادی فرق ہے؟
    • A. Bar magnets are permanent, but electromagnets are temporary
    • B. Electromagnets are used in motors, but bar magnets are used in generators
    • C. Electromagnets need electricity but bar magnets do not need electricity
    • D. Electromagnets are stronger than bar magnets
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