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SSC CGL 2020 MCQ Questions & Answers (English) - ObjectiveMcq

SSC CGL 2020

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Chemistry1 Physics1

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SSC CGL 2020 - Questions and Answers

Browse the questions, answers and explanations for SSC CGL in 2020.

2 questions · Page 1 of 1

SSC CGL2020Chemistry Electrochemistry

During electrolysis of water, which gas is produced at the cathode?

Oxygen

Chlorine

Hydrogen

Nitrogen

View Answer

Correct Answer: C — Hydrogen

Explanation:

At the cathode (negative electrode), reduction occurs: $2H^+ + 2e^- \rightarrow H_2$ . So hydrogen is produced.

SSC CGL2020Physics Magnetism

Which property of a magnet is used in an electric motor?

Attraction between like poles

Force on a current-carrying conductor in a magnetic field

Magnetic induction

Self-inductance

View Answer

Correct Answer: B — Force on a current-carrying conductor in a magnetic field

Explanation:

Electric motors work on the principle that a current-carrying conductor placed in a magnetic field experiences a force (Fleming's left-hand rule).

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