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Question 1. Which of the following is the SI base unit for mass? A) Gram B) Kilogram C) Pound D) Ounce Answer: B Explanation: The kilogram (kg) is the SI base unit for mass. The gram is a derived unit, and pounds and ounces are non-SI units. Question 2. Which measurement contains the correct number of significant figures? A) 0.00340 (3 significant figures) B) 15.00 (2 significant figures) C) 8.020 (2 significant figures) D) 100.0 (2 significant figures) Answer: A Explanation: 0.00340 has three significant figures; leading zeros are not counted. The other choices miscount the significant figures. Question 3. What is the result of 2.50 × 10^3 × 6.0 × 10^-2, expressed in correct scientific notation and significant figures? A) 1.500 × 10^ B) 15.00 × 10^ C) 1.5 × 10^ D) 150 × 10^ Answer: C Explanation: (2.50 × 10^3) × (6.0 × 10^-2) = 15 × 10^1 = 1.5 × 10^2; two significant figures due to 6.0. Question 4. Which derived SI unit is equivalent to a joule? A) kg·m/s B) kg·m^2/s^
C) N·s D) W·s Answer: B Explanation: 1 joule = 1 kg·m^2/s^2, the SI unit for energy. Question 5. A distance of 5.0 miles is approximately how many kilometers? (1 mile = 1.609 km) A) 3.1 km B) 8.0 km C) 8.05 km D) 5.0 km Answer: C Explanation: 5.0 × 1.609 = 8.045 km, rounded to 8.05 km (3 significant figures). Question 6. Which graph feature represents the acceleration of an object on a velocity vs. time graph? A) Slope B) Area under the curve C) Y-intercept D) Maximum point Answer: A Explanation: The slope of a velocity vs. time graph gives acceleration. Question 7. The area under a force vs. displacement graph represents: A) Work done B) Power C) Momentum D) Kinetic energy Answer: A Explanation: The area under the force versus displacement curve is the work done.
Answer: C Explanation: Controlled variables are held constant to ensure a fair test. Question 12. Which is the correct sequence for the scientific method? A) Hypothesis, experiment, observation, conclusion, communication B) Observation, hypothesis, experiment, analysis, conclusion C) Experiment, observation, hypothesis, conclusion, communication D) Hypothesis, analysis, observation, conclusion, communication Answer: B Explanation: The standard scientific method begins with observation, then hypothesis, experiment, analysis, and conclusion. Question 13. What is the main purpose of a scientific model? A) To provide exact predictions B) To simplify complex phenomena C) To replace scientific laws D) To serve as unchangeable facts Answer: B Explanation: Models simplify and represent complex systems to help understanding and prediction. Question 14. Which statement is true regarding scientific theories? A) Theories become laws after repeated testing B) Theories are tentative explanations supported by evidence C) Theories are guesses with little evidence D) Theories are unchangeable truths Answer: B Explanation: Theories are well-supported explanations that can evolve with new evidence. Question 15. Peer review in science is important because it:
A) Ensures only positive results are published B) Prevents scientific fraud and errors C) Guarantees funding for research D) Stops research from being replicated Answer: B Explanation: Peer review helps catch errors and prevents fraud, improving scientific reliability. Question 16. Which of the following best distinguishes a scientific law from a scientific theory? A) Laws explain, theories describe B) Laws describe patterns; theories explain mechanisms C) Laws are less supported by evidence D) Laws are more tentative than theories Answer: B Explanation: Laws describe observed patterns; theories explain why those patterns occur. Question 17. Which is NOT a limitation of scientific inquiry? A) Cannot address supernatural phenomena B) Must be based on observable evidence C) Can answer every philosophical question D) Is subject to error and bias Answer: C Explanation: Science cannot answer all philosophical questions, especially those outside empirical evidence. Question 18. Which of the following is an ethical consideration in physics research? A) Fabricating data to match a hypothesis B) Plagiarizing another’s results C) Ensuring the safety of human subjects D) Ignoring environmental impacts
A) Acceleration B) Force C) Velocity D) Displacement Answer: C Explanation: The slope of a distance (position) vs. time graph is velocity. Question 23. If an object moves in a straight line at constant speed, what is its acceleration? A) Zero B) Equal to its velocity C) Constant and nonzero D) Increasing Answer: A Explanation: Constant speed and direction means zero acceleration. Question 24. An object accelerates uniformly from rest to 20 m/s in 4 seconds. What is its acceleration? A) 5 m/s² B) 4 m/s² C) 10 m/s² D) 2.5 m/s² Answer: A Explanation: a = (v_f - v_i)/t = (20 - 0)/4 = 5 m/s². Question 25. A projectile is launched horizontally from a 20 m high cliff. Ignoring air resistance, what remains constant during its flight? A) Vertical velocity B) Horizontal velocity C) Acceleration in the vertical direction D) Total speed
Answer: B Explanation: Horizontal velocity stays constant (no horizontal force); vertical velocity changes due to gravity. Question 26. What is the relative velocity of two cars moving in the same direction at 30 m/s and 20 m/s? A) 50 m/s B) 10 m/s C) - 10 m/s D) 0 m/s Answer: B Explanation: Relative velocity = 30 m/s - 20 m/s = 10 m/s. Question 27. On a velocity vs. time graph, the area under the curve represents: A) Distance traveled B) Acceleration C) Displacement D) Jerk Answer: C Explanation: The area under velocity-time graph gives displacement. Question 28. Which of Newton’s Laws explains why passengers lurch forward when a car suddenly stops? A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Law of Universal Gravitation Answer: A Explanation: Newton's First Law (inertia) explains resistance to change in motion.
D) Only gravity acts Answer: A Explanation: The weight acts down, normal is perpendicular to surface; no friction. Question 33. A book rests on a table. Which force balances the book's weight? A) Friction B) Tension C) Normal force D) Applied force Answer: C Explanation: The table's normal force balances gravity on the book. Question 34. Two objects are connected by a light string over a frictionless pulley. What is the same for both objects? A) Mass B) Tension in the string C) Acceleration D) Weight Answer: C Explanation: Both objects share the same acceleration because they are connected. Question 35. Work is defined as: A) Force applied perpendicular to displacement B) Force applied parallel to displacement C) Mass times velocity D) Rate of energy transfer Answer: B Explanation: Work is force in the direction of displacement times that displacement.
Question 36. What is the work done by a 10 N force moving an object 4 m in the direction of the force? A) 40 J B) 14 J C) 2.5 J D) 0 J Answer: A Explanation: Work = Force × displacement = 10 N × 4 m = 40 J. Question 37. Which is an example of gravitational potential energy? A) A moving car B) A stretched spring C) A book on a shelf D) Sound waves Answer: C Explanation: A raised object has gravitational potential energy. Question 38. The work-energy theorem states: A) Total energy is always increasing B) Work done equals change in kinetic energy C) Potential energy changes into mass D) Work done equals the force applied Answer: B Explanation: The net work done on an object equals its change in kinetic energy. Question 39. Which is a non-conservative force? A) Gravitational B) Spring force C) Friction D) Electric force
B) They rebound with equal and opposite velocities C) They continue unchanged D) They lose all momentum Answer: A Explanation: In a perfectly inelastic collision, objects stick together and move as one. Question 44. What is the center of mass? A) The heaviest point of an object B) The point where all mass is concentrated C) The average position of mass in an object D) The highest point of an object Answer: C Explanation: Center of mass is the average position of all mass in an object. Question 45. Angular velocity is measured in: A) m/s B) rad/s C) m/s² D) N·m Answer: B Explanation: Angular velocity has SI units of radians per second (rad/s). Question 46. Torque is the rotational analog of: A) Force B) Energy C) Power D) Work Answer: A Explanation: Torque causes angular acceleration, just as force causes linear acceleration.
Question 47. What is the SI unit for moment of inertia? A) kg·m B) kg·m² C) kg·m/s D) kg·m²/s² Answer: B Explanation: Moment of inertia = mass × (distance)² = kg·m². Question 48. Which law relates torque and angular acceleration? A) Newton’s First Law B) Newton’s Second Law for rotation C) Conservation of energy D) Conservation of charge Answer: B Explanation: Newton’s Second Law for rotation: τ = Iα. Question 49. The rotational kinetic energy of a rotating object depends on: A) Only its angular velocity B) Its moment of inertia and angular velocity C) Its mass only D) Its angular acceleration Answer: B Explanation: Rotational kinetic energy = ½ Iω². Question 50. Which is conserved when no external torque acts on a system? A) Linear momentum B) Gravitational potential energy C) Angular momentum
A) Wavelength B) Amplitude C) Frequency D) Speed Answer: B Explanation: For mechanical waves, energy is proportional to the square of amplitude. Question 55. The superposition principle states that: A) Waves always cancel each other B) The resultant wave is the sum of individual waves C) Only one wave can exist at a time D) Waves reflect only at boundaries Answer: B Explanation: Waves add together algebraically when they overlap. Question 56. What is a node in a standing wave? A) Point of maximum displacement B) Point of zero displacement C) Point of maximum velocity D) Point of maximum pressure Answer: B Explanation: A node is a point of no displacement in a standing wave. Question 57. What happens to the pitch of a sound as the source approaches an observer? A) It decreases B) It increases C) It stays the same D) It disappears Answer: B
Explanation: Due to the Doppler effect, frequency (and pitch) increases as the source approaches. Question 58. Newton’s Law of Universal Gravitation states that force is: A) Directly proportional to masses and inversely proportional to distance B) Directly proportional to distance and inversely proportional to mass C) Directly proportional to the square of mass D) Inversely proportional to the square of distance Answer: D Explanation: The force is inversely proportional to the square of the distance between masses. Question 59. What is the gravitational field strength at Earth's surface? A) 9.8 m/s B) 9.8 N/kg C) 6.67 × 10^-11 N·m²/kg² D) 1.0 kg/m³ Answer: B Explanation: Gravitational field strength (g) is 9.8 N/kg at Earth’s surface. Question 60. Which of the following is conserved in planetary orbits around the sun? A) Linear momentum B) Angular momentum C) Electric charge D) Temperature Answer: B Explanation: In the absence of external torques, planetary angular momentum is conserved. Question 61. The gravitational potential energy between two masses is: A) Always positive B) Zero at infinite separation
Question 65. The electric field at a point is defined as: A) The force on a unit mass B) The force per unit charge C) The work done per unit distance D) The energy per unit charge Answer: B Explanation: Electric field E = F/q. Question 66. Which diagram best represents electric field lines near a positive point charge? A) Lines point towards the charge B) Lines form circles around the charge C) Lines point away from the charge D) Lines are absent Answer: C Explanation: Field lines radiate outward from positive charges. Question 67. The potential difference between two points is: A) The work done per unit charge B) The force per unit charge C) The charge per unit work D) The energy lost per unit mass Answer: A Explanation: Voltage (potential difference) = work done per charge. Question 68. Equipotential lines are always: A) Perpendicular to electric field lines B) Parallel to electric field lines C) Diagonal to electric field lines D) Randomly oriented
Answer: A Explanation: Equipotential lines are perpendicular to field lines. Question 69. The capacitance of a parallel-plate capacitor depends on: A) Voltage only B) Plate area and separation C) Current D) Resistance Answer: B Explanation: Capacitance = ε₀A/d; depends on area and separation. Question 70. A dielectric inserted between capacitor plates: A) Decreases capacitance B) Increases capacitance C) Has no effect D) Increases voltage Answer: B Explanation: Dielectrics increase the capacitance by reducing the effective field. Question 71. Which device stores energy in an electric field? A) Inductor B) Resistor C) Capacitor D) Battery Answer: C Explanation: Capacitors store energy in their electric field. Question 72. Which is the correct unit for electric current? A) Ampere
