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

The answer is: (C) –11 ☑

Q. 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

The answer is: (D) 32 joule ☑

Q. 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

The answer is: (B) capacitance ☑

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

The answer is: (C) Gamma rays ☑

Q. The SI unit of force is
(A) Newton
(B) joule
(C) watt
(D) farad

The answer is: (A) Newton ☑

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