Vectors and Equilibrium Physics MCQs
Multiple choice questions
1.) Vector of zero magnitude and arbitrary direction what is it called
a) Unit vector. b) Equal vector
c) Null vector. d) Scalar vector
Ans : c) Null vector
2.) If two vector have same direction and magnitude then it is
a) Unit vector. b) Equal vector
c) Null vector. d) Scalar vector
Ans : b) Equal vector
θ3.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component then the magnetude of resultant vector R is ,R =_______
a)√(Rx+Ry).
b) √(R²x+R²y)
c) (Rx+Ry).
d) (R²x+R²y)
Ans : b) √(R²x+R²y)
4.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component then the direction of the resultant vector R is , θ=____
a) tan(Rx/Ry).
b) tan-1(Ry/Rx)
c) tan-1(Rx/Ry).
d) tan(Ry/Rx)
Ans : b)tan-1(Ry/Rx)
5.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if both Rx and Ry are positive then resultant magnetude lies in the
a) First quadrant.
b) Second quadrant
c) Third quadrant.
d) Fourth quadrant
Ans : a) First quadrant
6.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if both Rx and Ry are positive then it’s direction θ will be
a)Φ.
b)180°-Φ
c) 180°+Φ.
d) 360°-Φ
Ans : a) Φ
7.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if Rx is nagetive and Ry is positive then the resultant magnetude lies in the
a) First quadrant.
b) Second quadrant
c) Third quadrant.
d) Fourth quadrant
Ans : b) Second quadrant
8.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if Rx is nagetive and Ry is positive then it’s direction θ will be
a) Φ.
b) 180°-Φ
c) 180°+Φ.
d) 360°-Φ
Ans : b)180°-Φ
9.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if both Rx and Ry are nagetive then resultant magnetude lies in the
a) First quadrant.
b) Second quadrant
c) Third quadrant.
d) Fourth quadrant
Ans : c) Third quadrant
10.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if both Rx and Ry are nagetive then it’s direction θ will be
a)Φ.
b)180°-Φ
c) 180°+Φ.
d) 360°-Φ
Ans : c) 180°+Φ
11.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if Rx is positive and Ry is nagetive then the resultant magnetude lies in the
a) First quadrant.
b) Second quadrant
c) Third quadrant.
d) Fourth quadrant
Ans : d) Fourth quadrant
12.) Rx be the resultant vector of x- component and Ry be the resultant vector of y- component, if Rx is positive and Ry is nagetive then it’s direction θ will be
a)Φ.
b)180°-Φ
c) 180°+Φ.
d) 360°-Φ
Ans : d) 360°-Φ
13.) The scalar product of two mutually perpendicular vector is
a) zero.
b) one
c) -one.
d) Infinite
Ans : a) zero
14.) The scalar product of two parallel vectors is
a) zero.
b) equal
c) -one.
d) Infinite
Ans : b) equal
15.) î.ĵ = ĵ.k̂ = k̂.î = _____
a)0.
b) 1
c) -1.
d) ∞
Ans : a) 0
16.) î.î = ĵ.ĵ = k̂.k̂ = _____
a)0.
b) 1
c) -1.
d) ∞
Ans : b) 1
17.) Fill in the blank
cosθ = AxBx+AyBy+AzBz/_______
a)2.
b) AxByAz
c) AB.
d) AzBz
Ans : c) AB
18.) The cross product of vector A and B can be written as, A×B = _____
a)Bsinθn̂.
b) ABsinθn̂
c) ABcosθn̂.
d) Acosθ
Ans : b) ABsinθn̂
19.) When a force F is applied on a rigid body at a point whose position vector is r from any poin of the axis about which the body rotates, then the turning effect of the force, called the torque then,
a) = r×F.
b) r = ×F
c) F = ×r.
d) F = r/2
Ans : a) = r×F
20.) The force on a particle of charge q and velocity v in a Magnetic field of strength B can be written as
a) F = q(B+v).
b) F = q(v×B)
c) F = B(q+v).
d) F = q(B/v)
Ans : b) F = q(v×B)
21.) The relation between force F and torque and moment of arm l is
a) = l/2F.
b) = l/F
c) = lF.
d) = lF/2
Ans : c) = lF
22.) The SI unit of torque can be written as
a)Nm-1
b) Nm
c) Nms-1
d) Nm-1s-1
Ans : b) Nm
23.) Fill in the blank.
When first condition of equilibrium is satisfied, there is no linear acceleration and body will be in _______ equilibrium
a) translation.
b) rotation
c) dynamic.
d) static
Ans : a) translation
24.) Fill in the blank.
When the second condition of equilibrium is satisfied, there is no angular acceleration and body will be in _______ equilibrium.
a) translation.
b) rotation
c) dynamic.
d) static
Ans : b) rotation
25.) Fill in the blank.
If a body is at rest , it is said to be in ______ equilibrium.
a) translation.
b) rotation
c) dynamic.
d) static
Ans : d) static
26.) If the body is moving with uniform velocity then it is said to be in ______ equilibrium.
a) translation.
b) rotation
c) dynamic.
d) static
Ans : c) dynamic
27.) The product of the force and the moment arm is called
a) equilibrium.
b) angular acceleration
c) translation acceleration.
d) torque
Ans : d) torque
28.) The perpendicular distance from the axis of rotation to the direction of line of action of the force, then it is called
a) moment arm.
b) angular acceleration
c) equilibrium.
d) translation acceleration
Ans : a) moment arm
29.) The sum of torque on the bodies about any axis must be equal to zero then the body is in ______ equilibrium.
a) moment arm.
b) angular acceleration
c) rotational
d) translation acceleration
Ans : c) rotational
30.) A quantity that has magnetude only, then it is
a) scalar.
b) vector
c) rectangular.
d) cartesian
Ans : a) scalar
31.) A quantity that has both direction and magnitude then it is,
a) scalar.
b) vector
c) rectangular.
d) cartesian
Ans : b) vector
32.) The arrangement of mutually perpendicular axis is called _______ coordinate system.
a ) scalar.
b) vector
c) rectangular.
d) cartesian
Ans : c) rectangular
33.) The sum vector of two or more vectors is called,
a) scalar vector
b) cartisian vector
c) rectangular vector
d) resultant vector
Ans : d) resultant vector