Physics MCQs

Page No. 45

Cosθi^ Sinθj^ is a_________________?


aVector

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b Position Vector

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

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

✓



Maximum number of rectangular components are_____________?


a1

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b 2

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c3

✓


d4

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View Answer 3

The rectangular coordinate system is also called______________?


aPolar coordinate system

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b Cartesian coordinate system

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cCylindrical coordinate system

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dSpherical coordinate system

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Unit vector n^ is along______________?


aX-axis

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bNormal on a surface

✓


c Y-axis

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dZ-axis

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


aDimensionless

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bDimensional scalar

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cNegative

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dAll A, B and C are correct

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The direction of a vector in space is specified by_______________?


aOne angle

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bTwo angle

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cThree angle

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dNo angle

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View Answer Three angle

Addition of vector obeys_____________?


aCommutative law

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bDistributive law

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cAssociative law

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dAll given laws in A, B and C

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An inductor may store energy in ________________?


aIts electric field

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bIts coils

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cIts magnetic field

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dBoth electric and magnetic fields

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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

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bV/√2√R

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cV02/√2R

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d2/√2√R

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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

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bEach decrease

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cEach remains the same

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d One increases whereas that in the other decreases

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View Answer Each decrease

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