Physics MCQs

Page No. 45

Cosθi^ Sinθj^ is a_________________?


aVector


b Position Vector


cVector in the direction at angle θ with an x-axis


dThe unit vector in the direction at angle θ with an x-axis



Maximum number of rectangular components are_____________?


a1


b 2


c3


d4


View Answer 3

The rectangular coordinate system is also called______________?


aPolar coordinate system


b Cartesian coordinate system


cCylindrical coordinate system


dSpherical coordinate system



Unit vector n^ is along______________?


aX-axis


bNormal on a surface


c Y-axis


dZ-axis



A vector can be multiplied by a number. The number may be_______________?


aDimensionless


bDimensional scalar


cNegative


dAll A, B and C are correct



The direction of a vector in space is specified by_______________?


aOne angle


bTwo angle


cThree angle


dNo angle


View Answer Three angle

Addition of vector obeys_____________?


aCommutative law


bDistributive law


cAssociative law


dAll given laws in A, B and C



An inductor may store energy in ________________?


aIts electric field


bIts coils


cIts magnetic field


dBoth electric and magnetic fields


View Answer Its magnetic field

A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?


aV√/√2R


bV/√2√R


cV02/√2R


d2/√2√R


View Answer V02/√2R

Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?


aEach increase


bEach decrease


cEach remains the same


d One increases whereas that in the other decreases


View Answer Each decrease

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