Class XII Maths Vectors 2

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Question 1

Resultant of which of the following may be equal to zero ?

• A10N; 10N; 30 N
• B10N; 20N; 30N; 40N
• C5N; 10N; 20N; 40N
• Dnone of these

Question 2

Which of the following is independent of choice of coordinate system -

• AP + Q + R
• B(P_x + Q_x + R_x)
• C(P_x + Q_y)
• Dall of these

Question 3

The sum of two forces acting at a point is 16N. If the resultant force is 8N and its direction is perpendicular to minimum force, then the force are -

• A6 N & 10 N
• B8 N & 8 N
• C4 N & 12 N
• D2 N & 14 N

Question 4

A force of (10 – 3 + 6) newton acts on a body of mass 100 g and displaces it from (6 + 5 – 3) meter to (10 – 2 + 7) metre. The work done is ­–

• A21 J
• B121 J
• C361 J
• D1000 J

Question 5

If vector , & have magnitude 5, 12 and 13 units and + = the angle between and is -

• Acos^–1
• Bcos^–1
• Ccos^–1
• Dcos^–1

Question 6

x = at²; y = 2at, then

• At
• B
• C1
• Dnone

Question 7

Two forces of 4 dyne and 3 dyne act upon a body. The resultant force on the body can only be -

• Amore than 3 dynes
• Bmore than 4 dynes
• Cbetween 3 and 4 dynes
• Dbetween 1 and 7 dynes (including 1 dyne & 7 dyne)

Question 8

If ,, are three non-coplanar vectors, then + =

• A0
• B1
• C2
• DNone of these

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