Science → MCQs → Physics → Physics Questions and Answers from 61 to 65

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61. If $A=2i+3j-4k$ and $B=6i-j+5k$ then A·b=?
(A) –7
(B) 7
(C) –11
(D) 11

62. When a force $F=4i+6j$ is applied to an object, it undergoes a displacement of $d=2i+4j$. What is the work done?
(A) 26 joule
(B) 28 joule
(C) 30 joule
(D) 32 joule

63. The tuning of a radio or TV receiver is usually done by varying the _____ of the circuit.
(A) inductance
(B) capacitance
(C) resistance
(D) voltage

64. Which from the following radiations has the highest penetrating power?
(A) Alpha rays
(B) Beta rays
(C) Gamma rays
(D) None of these

65. The SI unit of force is
(A) Newton
(B) joule
(C) watt