In which quadrant or quadrants do both rectangular components of a vector have the same sign?
Correct answer B. Both 1st and 3rd
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Physics MCQs
Page 27 of Physics multiple-choice questions with answers. Tap an option to check yourself.
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What is true of a central force?
Correct answer B. Cannot produce torque
If A = Ax î + Ay ĵ + Az k̂ and B = Bx î + By ĵ + Bz k̂, which expression is correct?
Correct answer D. A · B = AxBx + AyBy + AzBz
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What is the magnitude of î · (ĵ × k̂)?
Correct answer C. 1
In which quadrants is the value of tan positive?
Correct answer C. Both 1st and 3rd
When does the cross product of two vectors become a negative vector?
Correct answer C. When they are rotated through 270°
What is the unit vector in the direction of A = 2î − 2ĵ + k̂?
Correct answer C. (2î − 2ĵ + k̂)/3
What is the result of the cross product î × ĵ?
Correct answer B. k̂
Why is it easier to turn a steering wheel using both hands rather than one?
Correct answer A. A couple acts on the wheel
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Which of these pairs of quantities does not share the same dimensions?
Correct answer B. Mass and moment of inertia
Three coplanar forces acting on a body keep it in equilibrium. What must be true of these forces?
Correct answer B. Concurrent
Two forces of equal magnitude have a resultant with that same magnitude. What is the angle between them?
Correct answer D. 120°
What is the maximum number of components into which a vector can be resolved?
Correct answer D. Infinite
What does the expression cos θ î + sin θ ĵ represent?
Correct answer C. The unit vector in the direction at angle θ with the x-axis
What is the maximum number of mutually perpendicular (rectangular) components a vector can have?
Correct answer A. 3
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What is another name for the rectangular coordinate system?
Correct answer A. Cartesian coordinate system
In which direction does the unit vector n̂ point?
Correct answer B. Normal to a surface
A vector can be multiplied by a number. What kind of number can it be?
Correct answer D. All of A, B and C
How many angles are needed to specify the direction of a vector in space?
Correct answer B. Three angles
Which laws does vector addition obey?
Correct answer D. All of the laws in A, B and C