17. Which of the following forces primarily underlies the mechanism of nuclear power? (A) Gravitational force (B) Electric force (C) Magnetic force (D) Weak force (E) Strong force

7. Which of the following statements about superconductivity is correct? (A) All materials become superconducting below 30 K (B) The resistance of a superconductor is zero (C) Superconductivity violates the first law of thermodynamics (D) Superconductivity violates the second law of thermodynamics (E) All the above are incorrect

17. Which of the following forces primarily underlies the mechanism of nuclear power?
(A) Gravitational force
(B) Electric force
(C) Magnetic force
(D) Weak force
(E) Strong force

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