#1
Which of the following is a scalar quantity?
Mass
ExplanationScalar quantities have only magnitude, and mass is a scalar quantity as it represents the amount of matter in an object.
#2
What is the definition of momentum in classical mechanics?
Velocity multiplied by mass
ExplanationMomentum, a vector quantity, is the product of an object's mass and its velocity.
#3
What is Hooke's Law related to in classical mechanics?
Elasticity
ExplanationHooke's Law describes the relationship between the force exerted on a spring and its resulting displacement, demonstrating the elastic property of materials.
#4
What is the relation between the linear velocity and angular velocity of a point on a rotating object?
Linear velocity = Angular velocity × Radius
ExplanationThe linear velocity of a point on a rotating object is equal to the product of its angular velocity and the distance from the axis of rotation (radius).
#5
What is the relationship between the period and frequency of a harmonic oscillator?
Period = 1 / Frequency
ExplanationThe period of a harmonic oscillator, the time taken for one complete cycle, is inversely proportional to its frequency, with the relationship given by Period = 1 / Frequency.
#6
What is the relationship between force, mass, and acceleration in Newton's second law of motion?
Force = mass × acceleration
ExplanationNewton's second law states that the force acting on an object is equal to the mass of that object multiplied by its acceleration.
#7
In projectile motion, what is the path followed by a projectile under the influence of gravity alone?
Parabola
ExplanationThe trajectory of a projectile under the sole influence of gravity forms a parabola due to the constant acceleration downward.
#8
What is the condition for an object to be in equilibrium under the influence of multiple forces?
The net force acting on the object is zero
ExplanationFor an object to be in equilibrium, the vector sum of all external forces acting on it must be zero.
#9
In a simple harmonic motion, what does the amplitude represent?
Maximum displacement from equilibrium
ExplanationAmplitude in simple harmonic motion represents the maximum distance an oscillating object moves away from its equilibrium position.
#10
Which of the following is a fundamental force in nature responsible for holding atomic nuclei together?
Strong nuclear force
ExplanationThe strong nuclear force is a fundamental force that binds protons and neutrons within atomic nuclei, overcoming the electromagnetic repulsion between positively charged protons.
#11
What is the center of mass of an object?
A point where mass is concentrated
ExplanationThe center of mass is a point in an object where its mass can be considered to be concentrated, simplifying the analysis of its motion.
#12
What is the work-energy theorem in classical mechanics?
The net work done on an object is equal to its change in kinetic energy
ExplanationThe work-energy theorem states that the net work done on an object is equal to the change in its kinetic energy.
#13
What is the rotational analog of mass in rotational dynamics?
Moment of inertia
ExplanationIn rotational dynamics, moment of inertia plays a role analogous to mass in linear motion, determining an object's resistance to changes in rotational motion.
#14
What is Kepler's second law of planetary motion?
A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time
ExplanationKepler's second law states that a line segment joining a planet and the Sun sweeps out equal areas in equal time intervals, implying non-uniform orbital speeds.
#15
According to the principle of conservation of angular momentum, what happens when a spinning ice skater pulls in their arms?
Angular momentum remains constant
ExplanationConservation of angular momentum dictates that the total angular momentum of a closed system remains constant, so when a skater pulls in their arms, their rotation speed increases.
#16
In classical mechanics, what does the term 'inertia' refer to?
Resistance to motion
ExplanationInertia is the tendency of an object to resist changes in its state of motion, either at rest or in uniform motion.
#17
What is the principle behind a lever in mechanics?
Torque
ExplanationThe principle behind a lever involves the application of torque, a rotational force that results in the turning or rotation of the lever around a fixed point.