3. Which of the following particles is most responsible for the formation of the Earth’s magnetic field?
(A) Neutron (B) Proton (C) Electron (D) Ion
✅ Answer: (C) Electron
4. Which of the following types of radiation has the highest penetrating power?
(A) Alpha radiation
(B) Beta radiation
(C) Gamma radiation
(D) X-rays
✅ Answer: (C) Gamma radiation
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