Physics MCQs

Page No. 42

A body in equilibrium__________________?


a Always at rest

✖


b Always in uniform motion

✖


cMay be at rest or in uniform motion

✓


dMay be at rest or in motion

✖



Torque acting on a body determines_______________?


aAcceleration

✖


bLinear acceleration

✖


cAngular acceleration

✓


dDirection of motion of the body

✖


View Answer Angular acceleration

SI unit of torque is______________?


aN.m

✓


b joule

✖


cBoth a and b are correct

✖


d Neither a nor b is correct

✖


View Answer N.m

The dimension of torque is______________?


a[ML2T-2]

✓


b[MLT-2]

✖


c[ML2T]

✖


d [ML-2T-2]

✖


View Answer [ML2T-2]

Torque is defined as______________?


aTurning effect of force

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bCross product of position vector and force

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cProduct of force and moment arm

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dAll A, B and C are correct

✓



The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?


a 30°

✖


b45°

✓


c60°

✖


d180°

✖


View Answer 45°

An angle between two vectors A and B can be determined by_____________?


a Their dot product

✓


bTheir cross product

✖


cHead to tail rule

✖


dRight-hand rule

✖


View Answer Their dot product

Which one is a unit vector ?


a??3 i^ + ??3 j^ + ??3 k^

✖


b1/??3 i^ + 1/??3 j^ +1/ ??3 k^

✖


c??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^

✖


d Both B and C are correct

✓



Null vector is a vector which has________________?


aZero magnitude

✖


bNo specified direction

✖


cBoth A and B are correct

✓


dBoth A and B are not correct

✖



If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?


aWest

✖


bNorth

✖


cDown

✓


dUp

✖


View Answer Down

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