Physics is a crucial subject for exams like the OSSSC LSI, Forester, and FG. To excel in these exams, it’s essential to have a strong grasp of fundamental physics principles. Multiple Choice Questions (MCQs) are a popular assessment tool in such exams, testing candidates’ understanding of various concepts. Here, we’ve compiled a list of the top 30 physics MCQs along with detailed answers and explanations to help you prepare effectively.
Top 30 Physics MCQs for OSSSC LSI, Forester, FG 03 April 2024
- Which of the following is responsible for the fact that a tennis ball bounces higher at high altitudes than in plains?
[A] Low Gravity
[B] High Gravity
[C] Less dense air
[D] Low atmospheric temperatureCorrect Answer: C [Less dense air]
Notes: The rarified air at high altitudes gives less resistance to the ball. - Ohm is a unit of measuring _________?
[A] Resistance
[B] Voltage
[C] Current
[D] None of the aboveCorrect Answer: A [Resistance]
Notes: The ohm is the SI unit of electrical resistance. It measures the obstruction to the flow of electric current. - Which of the following is the SI unit of electric current?
[A] Ampere (A)
[B] Volt (V)
[C] Ohm (Ω)
[D] Joule (J)Correct Answer: A [Ampere (A)]
Notes: The Ampere is the SI unit of electric current, representing the rate of flow of electric charge. - What property of a material determines its resistance?
[A] Density
[B] Conductivity
[C] Volume
[D] MassCorrect Answer: B [Conductivity]
Notes: Resistance depends on the material’s conductivity, which is the ability to conduct electric current. - Which of the following factors affects the resistance of a conductor?
[A] Length
[B] Color
[C] Shape
[D] DensityCorrect Answer: A [Length]
Notes: The resistance of a conductor increases with its length, as longer conductors offer more obstruction to the flow of electric current. - Which type of radiation is commonly used in the gemstone industry to change white topaz into blue topaz?
[A] X-Rays
[B] Gamma Rays
[C] Alpha Radiation
[D] Beta RadiationCorrect Answer: B [Gamma Rays]
Notes: Gamma rays are commonly used in the gemstone industry to change white topaz into blue topaz through heat treatment. - What is the primary method used to transform white topaz into blue topaz in the gemstone industry?
[A] Heating
[B] Cooling
[C] Chemical Bath
[D] GrindingCorrect Answer: A [Heating]
Notes: White topaz is commonly heat-treated to turn it into blue topaz in the gemstone industry. - Why is the value of blue topaz often decreased compared to white topaz?
[A] It loses clarity during treatment.
[B] It becomes more brittle.
[C] Its color is less desirable.
[D] Its value remains the same.Correct Answer: C [Its color is less desirable.]
Notes: Despite the transformation, the color of blue topaz is often considered less desirable in the gemstone market compared to the natural color of white topaz, leading to a decrease in its value. - What term refers to the acceleration of an object at a specific instant of time?
[A] Average acceleration
[B] Instantaneous acceleration
[C] Variable acceleration
[D] Zero accelerationCorrect Answer: B [Instantaneous acceleration]
Notes: The acceleration of an object at a given instant of time is called instantaneous acceleration. - What is the maximum height that a projectile can attain in its trajectory?
[A] Equal to its maximum range
[B] One half of its maximum range
[C] One-fourth of its maximum range
[D] Twice of its maximum rangeCorrect Answer: C [One-fourth of its maximum range]
Notes: The maximum height reached by a projectile is typically one-fourth of its maximum range. - Which of the following motions is associated with a projectile?
[A] Uniform motion
[B] Circular motion
[C] Oscillatory motion
[D] Parabolic motionCorrect Answer: D [Parabolic motion]
Notes: The motion of a projectile follows a parabolic trajectory due to the influence of gravity. - At what point in its trajectory does a projectile have its maximum velocity?
[A] At the beginning of its motion
[B] At the end of its motion
[C] At the midpoint of its trajectory
[D] At the maximum height attainedCorrect Answer: A [At the beginning of its motion]
Notes: The projectile has its maximum velocity at the beginning of its motion. - What factor primarily determines the range of a projectile?
[A] Initial velocity
[B] Angle of projection
[C] Mass of the projectile
[D] Air resistanceCorrect Answer: B [Angle of projection]
Notes: The range of a projectile is primarily determined by the angle of projection at which it is launched. - What term describes the inability of a body to change its state of rest or motion?
[A] Force
[B] Momentum
[C] Displacement
[D] InertiaCorrect Answer: D [Inertia]
Notes: Inertia is the property of matter that resists changes in its state of motion or rest. - Which type of inertia refers to the tendency of an object to resist changes in its state of rest?
[A] Inertia of motion
[B] Inertia of direction
[C] Inertia of displacement
[D] Inertia of restCorrect Answer: D [Inertia of rest]
Notes: Inertia of rest is the type of inertia that describes an object’s resistance to changes in its state of rest. - What is always the nature of gravitational force between two objects?
[A] Always repulsive
[B] Always attractive
[C] May be attractive or repulsive
[D] None of the aboveCorrect Answer: B [Always attractive]
Notes: Gravitational force is always attractive in nature, unlike electric and magnetic forces, which can be either attractive or repulsive. - Which force is commonly considered the weakest force in nature?
[A] Gravitational force
[B] Electromagnetic force
[C] Strong nuclear force
[D] Weak nuclear forceCorrect Answer: A [Gravitational force]
Notes: Gravitational force is commonly considered the weakest force among the four fundamental forces of nature. - What is the slope of the velocity-time graph when an object moves with constant negative acceleration, having a positive initial velocity?
[A] 90°
[B] More than 90°
[C] Less than 90°
[D] 0°Correct Answer: B [More than 90°]
Notes: When an object moves with constant negative acceleration and positive initial velocity, the velocity-time graph has a slope greater than 90°. - What is the angular acceleration of a body moving with constant angular velocity?
[A] Equal to the angular velocity
[B] 1
[C] 0
[D] Can’t be determinedCorrect Answer: C [0]
Notes: The angular acceleration of a body moving with constant angular velocity is 0, as there is no change in the angular velocity over time. - What is the unit of angular acceleration?
[A] Radian per second
[B] Radian per second squared
[C] Meter per second squared
[D] Meter per secondCorrect Answer: B [Radian per second squared]
Notes: Angular acceleration is measured in radians per second squared, representing the change in angular velocity per unit time. - In which direction does the acceleration point when an object moves with constant speed in a circular path?
[A] Radially inward
[B] Tangential to the path
[C] Perpendicular to the path
[D] Radially outwardCorrect Answer: C [Perpendicular to the path]
Notes: When an object moves with constant speed in a circular path, its acceleration is directed perpendicular to the path towards the center of the circle. - What type of motion is characterized by a constant angular acceleration?
[A] Uniform circular motion
[B] Non-uniform circular motion
[C] Linear motion
[D] Projectile motionCorrect Answer: A [Uniform circular motion]
Notes: Uniform circular motion is characterized by a constant angular acceleration, where the magnitude of the velocity remains constant, but the direction changes continuously. - The value of the coefficient of limiting friction does not depend on which of the following?
[A] Nature of the surfaces in contact
[B] Total area of the surfaces in contact
[C] Material of the surfaces in contact
[D] All of the aboveCorrect Answer: B [Total area of the surfaces in contact]
Notes: The coefficient of limiting friction depends on the nature and material of the surfaces in contact but not on the total area of the surfaces. - What should be the angle between force and displacement for maximum work to be done?
[A] 0°
[B] 90°
[C] 180°
[D] 30°Correct Answer: A [0°]
Notes: For maximum work, the angle between force and displacement should be 0°, as the cosine of 0° is 1, maximizing the work done. - What term refers to the resistance to the motion of an object when it is in contact with another object?
[A] Inertia
[B] Friction
[C] Gravity
[D] MomentumCorrect Answer: B [Friction]
Notes: Friction is the force that opposes the motion of an object when it is in contact with another object or surface. - Which of the following factors affect the magnitude of frictional force between two surfaces?
[A] Surface area
[B] Velocity of the object
[C] Nature of the surfaces
[D] Mass of the objectCorrect Answer: C [Nature of the surfaces]
Notes: The magnitude of frictional force primarily depends on the nature of the surfaces in contact, such as their roughness or smoothness. - Which type of friction acts between surfaces that are not moving relative to each other?
[A] Static friction
[B] Kinetic friction
[C] Rolling friction
[D] Fluid frictionCorrect Answer: A [Static friction]
Notes: Static friction acts between surfaces that are not moving relative to each other, preventing the initiation of motion. - What is the Universal Gravitational Constant dependent on?
[A] Nature of the bodies
[B] Size of the bodies
[C] Nature of medium between the bodies
[D] None of the aboveCorrect Answer: D [None of the above]
Notes: The value of the Universal Gravitational Constant is the same throughout the universe and is independent of the nature of the bodies, size of the bodies, and nature of the medium between the bodies. - What property determines the gravitational force between two objects?
[A] Mass of the objects
[B] Volume of the objects
[C] Surface area of the objects
[D] Density of the objectsCorrect Answer: A [Mass of the objects]
Notes: The gravitational force between two objects is primarily determined by the mass of the objects. - Which factor affects the strength of the gravitational force between two objects?
[A] Distance between the objects
[B] Color of the objects
[C] Temperature of the objects
[D] Shape of the objectsCorrect Answer: A [Distance between the objects]
Notes: The strength of the gravitational force between two objects is inversely proportional to the square of the distance between them, according to Newton’s law of universal gravitation.
