1 : A force F is making an angle of 60° with x-axis. Its y-component is equal to:
A : F
B : Fsin60°
C : Fcos60°
D : Ftan60°
2 : In stable equilibrium, the centre of gravity of the body lies:
A : at the highest position
B : at the lowest position
C : at any position
D : may lie within, outside or on the surface
3 : The centre of mass of a body:
A : lies always inside the body
B : lies always outside the body
C : lies always on the surface of the body
D : outside the body
4 : A man walks on a tight rope. He balances himself by holding a bamboo stick horizontally. It is an application of:
A : law of conservation of momentum
B : Newton's second law of motion
C : principle of moments
D : Newton's third law of motion
5 : A cylinder resting on its circular base is in:
A : stable equilibrium
B : neutral equilibrium
C : unstable equilibrium
D : none of these
6 : Moment of force is called:
A : moment arm
B : couple
C : couple arm
D : torque
7 : Centripetal force is given by:
A : rF
B : rFcosθ
C : mv²/r
D : my
8 : A shopkeeper sells his articles by a balance having unequal arms of the pans. If he puts the weights in the pan having shorter arm, then the customer:
A : loses
B : gains
C : neither loses nor gains
D : not certain
9 : If F₁ and F₂ are the forces acting on a body and τ is the torque produced in it, the body will be completely in equilibrium when:
A : ΣF=0 and Στ=0
B : ΣF=0 and Στ≠0
C : ΣF≠0 and Στ=0
D : F≠0 and Στ≠0
10 : A particle is simultaneously acted upon by two forces of 4 and 3 newtons. The net force on the particle is:
A : 1 N
B : between 1 N and 7 N
C : 5 N
D : 7 N
11 : A body is said to be in equilibrium if :
A : It is moving with a constant acceleration
B : It is moving with a uniform velocity
C : It is at rest
12 : Where is correct of gravity of a square located?
A : At is the center
B : At one of the covers
C : On one of the sides
D : It depend on the density
13 : What is the resultant force on a body in equilibrium?
A : Equal to the weight of body
B : Zero
C : None of above
D : Equal to the mass of body
14 : What a happen to the stability of an object when its center of gravity in lowered?
A : It becomes less stable
B : It becomes more stable
C : At remain the same
D : It becomes unstable
15 : Which of the following is not a counter part of a quality in translational motion in rotational motion?
A : Velocity
B : Acceleration
C : Momentum
D : Energy
16 : What is the key principle behind resolving a force into its components?
A : The principle of superposition
B : The Pythagorean theorem
C : Newton’s third law
D : The Pythagorean theorem
17 : What is a component of a vector?
A : The direction of the water
B : the magnitude of the vector
C : the effective value of the vector in a specific direction
D : the change in vector over time
18 : Which of the following factors affects the moment of force?
A : Magnitude of the force
B : Distance from the point rotation
C : Angle of force
D : All of the above
19 : They head to tail rule is used to :
A : Calculate the magnitude of a force
B : Debarment the direction of a force
C : Find the resultant of multiply forces
D : Measure the angle between to forces
20 : In a balanced system, what is the net moment about any point?
A : Position
B : Negative
C : Zero
D : Cannot be determined
21 : Which of the following is not a characteristics of parallel forced:
A : They act along the same line
B : They always have the same magnitude
C : They can be added using head to tail rule
22 : Which of the following is not a source of a central force?
A : Gravity
B : Friction
C : tension
D : electrical force
23 : What happen to the centripetal force if the radius of the circular path is increased while beeping the speed constant?
A : The centrepitation fore increase
B : the centripetal force decrease
C : the centripetal force remains same
D : the centripetal force becomes zero
24 : Which of the following best describe the first condition of equilibrium?
A : The sum of all the forces is greater than zero
B : The sum of all torques is greater than zero
C : The sum of all torques is greater than zero
D : The object is in motion
25 : What is the primary factor that influence the stability an object?
