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ECAT Pre General Science Physics Chapter 2 Vectors and Equilibrium Online Test MCQs With Answers
Question # 1
The magnitude of resultant of three vectors is 3. Its x-component is one, y-component is two, then its z-component is:
Choose an answer
0
1
2
3
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Question # 2
A vector of magnitude 5 N is added to a vector of magnitude 8 N while the orientations are changeable. Range of their possible sum will be very from:
Choose an answer
Zero to 3 N
1 N to 13 N
13 N to 3 N
None of these
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Question # 3
The magnitude of the resultant of two forces may be increased by:
Choose an answer
Increasing the angle between them
Decreasing the angle between them
Drawing a triangle to represent them
None of these
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Question # 4
All trigonometric functions (sine, cosine, tangent etc) are positive in:
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1st quadrant
2nd quadrant
3rd quadrant
4th quadrant
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Question # 5
Two vectors to be combined have magnitudes of 60 N and 35 N. Pick the possible answer:
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100 N
70 N
20 N
Zero
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Question # 6
All trigonometric functions (since, cosine tangent etc. ) are positive in:
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1st Quadrant
2nd Quadrant
3rd Quadrant
4th Quadrant
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Question # 7
When the magnitude of two component vectors are equal to that of their resultant, then the angle between the components is:
Choose an answer
60
°
90
°
120
°
150
°
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Question # 8
Tick the correct answer:
Choose an answer
Torque is a vector quantity
Torque is the turning effect of a force
Torque is called moment of a force
All of above
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Question # 9
The perpendicular distance from the axis of rotation to the line of action of force is called:
Choose an answer
Moment arm
Moment of a force
Torque
Non of these
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Question # 10
If the vector 5 N lies along with x-axis, then its component along y-axis will be:
Choose an answer
Zero
5 N
7 N
10 N
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Question # 11
When a vector is multiplied by a negative number, its direction:
Choose an answer
Remains the same
Changes
Changes by 180
°
None of these
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Question # 12
The direction of a vector in space requires:
Choose an answer
X-axis
X and Y-axes
XYZ axes
Y and Z-axes
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Question # 13
Two forces each of 10 N act on a body, if the force are inclined at 30
° and 60
° respectively with x-axis, then x-component of their resultant is:
Choose an answer
20 N
13.66 N
10 N
8.66 N
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