#1
Which of the following is a scalar quantity?
Mass
ExplanationA scalar quantity has magnitude only.
#2
What is the SI unit of force?
Newton
ExplanationNamed after Sir Isaac Newton, it's the force required to accelerate a 1 kg mass by 1 m/s².
#3
Which of the following is NOT a type of friction?
Air friction
ExplanationAlso known as air resistance.
#4
What is the relationship between force and acceleration, as stated in Newton's Second Law?
F = ma
ExplanationForce is directly proportional to mass and acceleration.
#5
What is the principle of conservation of energy?
Energy cannot be created or destroyed; it can only be transformed from one form to another
ExplanationA fundamental law in physics.
#6
Which of the following is a vector quantity?
Displacement
ExplanationIt has both magnitude and direction.
#7
What is the formula to calculate pressure?
P = F/A
ExplanationForce exerted per unit area.
#8
What is the net force acting on an object in equilibrium?
Zero
ExplanationIn equilibrium, all forces cancel out.
#9
Which of the following laws states that every object continues in its state of rest or uniform motion in a straight line unless acted upon by a net external force?
Newton's First Law of Motion
ExplanationAlso known as the law of inertia.
#10
What is the formula to calculate gravitational force between two objects?
F = G * m1 * m2 / r
ExplanationG is the gravitational constant, m1 and m2 are masses, and r is the distance between their centers.
#11
What is the unit of measurement for momentum?
Kilogram-meter per second
ExplanationRepresenting mass in motion.
#12
What does the term 'inertia' refer to in mechanics?
The tendency of an object to resist a change in its motion
ExplanationRelated to mass, it opposes changes in motion.
#13
What is the formula to calculate work done?
W = Fd
ExplanationWork done is force multiplied by displacement.
#14
Which of the following is an example of a non-conservative force?
Friction
ExplanationEnergy is dissipated as heat.
#15
What is the formula to calculate kinetic energy?
E = 1/2 mv²
ExplanationKinetic energy is proportional to the square of velocity.
#16
Which of Newton's laws describes action and reaction forces?
Third Law
ExplanationFor every action, there is an equal and opposite reaction.
#17
What does Hooke's Law describe?
The relationship between force and displacement in a spring
ExplanationDescribes the behavior of elastic materials.
#18
Which of the following is a statement of the law of conservation of momentum?
The total momentum of a closed system is constant
ExplanationIn the absence of external forces, momentum is conserved.
#19
What does the term 'moment of inertia' represent?
The rotational analogue of mass in linear motion
ExplanationResistance to angular acceleration.
#20
Which of the following is a non-inertial reference frame?
A train accelerating uniformly
ExplanationExperiences fictitious forces due to acceleration.