EBSU-Phy 101 Past Questions and Answers

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  1. The measurement of the following physical quantity is the same:
    • A. Pressure and stress
    • B. Work and force
    • C. Velocity and acceleration
    • D. Length and mass
      Answer: A
  2. If a car is traveling at 8 m/s and accelerates uniformly at 2 m/s², its velocity after 5 seconds will be:
    • A. 20 m/s
    • B. 18 m/s
    • C. 25 m/s
    • D. 24 m/s
      Answer: B
  3. The maximum velocity acquired by a body falling through a viscous liquid is called:
    • A. Viscous velocity
    • B. Velocity gradient
    • C. Terminal velocity
    • D. Instantaneous velocity
      Answer: C
  4. If a spring has a stiffness of 950 N/m, what amount of work will be done in extending the spring by 60 mm?
    • A. 1.71 × 10² J
    • B. 1.71 × 10⁴ J
    • C. 1.71 × 10⁰ J
    • D. 17.1 × 10² J
      Answer: C
  5. For simple harmonic motion at the mean position, the angular momentum is:
    • A. Zero
    • B. Infinite
    • C. Maximum
    • D. Minimum
      Answer: A
  6. The work-energy equation is given as:
    • A. me = ½ mv²
    • B. ft = mv – mu
    • C. Fs = ½ m(v² – u²)
    • D. ½ m(v² + u²)
      Answer: C
  7. A body with a moment of inertia of 3.2 kgm² and an angular velocity of 2.5 rad/s. Find its kinetic energy:
    • A. 2 J
    • B. 0.5 J
    • C. 10.5 J
    • D. 10 J
      (Please provide the answer for question 7.)
  8. The SI unit of angular momentum is:
    • A. kgm/s
    • B. kgm²s⁻²
    • C. kgm²s²
    • D. kgm²rad/s
      Answer: D
  9. A 2 kg block is dropped from a height of 0.4 m onto a spring whose force constant, k, is 1600 N/m. Find the maximum distance the spring will be compressed:
    • A. 2 m
    • B. 0.2 m
    • C. 0.1 m
    • D. 1.0 m
      Answer: C
  10. A metal ball of radius 2.0 mm falls under gravity in oil with a coefficient of viscosity of 2.5 Nsm⁻². If the density of the oil is 950 kg/m³, what is the terminal velocity attained by the metal?
    • A. 3.1 × 10² m/s
    • B. 2.5 × 10² m/s
    • C. 4.3 × 10² m/s
    • D. 1.2 × 10² m/s
      Answer: B
  11. The pressure in a column of fluid does not depend on which of the following:
    • A. Density of fluid
    • B. Shape of the container
    • C. Weight of fluid
    • D. Gravity
      Answer: B
  12. The work done when a force of (1+2j+k)(1 + 2j + k)(1+2j+k) N displaces a body from r1=(−i−2k)r_1 = (-i – 2k)r1​=(−i−2k) m to r2=(j+k)r_2 = (j + k)r2​=(j+k) is:
    • A. 12 J
    • B. 10 J
    • C. 2 J
    • D. 6 J
      Answer: D
  13. Which of the following physical quantities is a scalar?
    • A. Electric field
    • B. Electric potential
    • C. Force
    • D. Velocity
      Answer: B
  14. If force FFF, velocity VVV, and acceleration AAA are taken as fundamental units instead of mass, length, and time, express impulse in terms of FFF, VVV, and AAA:
    • A. FV2A2FV^2A^2FV2A2
    • B. FVAFVAFVA
    • C. FA/VFA/VFA/V
    • D. FV/AFV/AFV/A
      Answer: D
  15. The dimension of the coefficient of viscosity is:
    • A. MLT−1MLT^{-1}MLT−1
    • B. M2L2T−1M^2L^2T^{-1}M2L2T−1
    • C. ML−1T−1ML^{-1}T^{-1}ML−1T−1
    • D. ML−2T2ML^{-2}T^2ML−2T2
      Answer: C
  16. A 6 kg object is subjected to three forces f1=20i+30jf_1 = 20i + 30jf1​=20i+30j N, f2=8i−50jf_2 = 8i – 50jf2​=8i−50j N, and f3=2i+2jf_3 = 2i + 2jf3​=2i+2j N. What is the acceleration?
    • A. 5i+3j m/s25i + 3j \, m/s^25i+3jm/s2
    • B. 5i−3j m/s25i – 3j \, m/s^25i−3jm/s2
    • C. 3i+5j m/s23i + 5j \, m/s^23i+5jm/s2
    • D. 3i−5j m/s23i – 5j \, m/s^23i−5jm/s2
      Answer: B
  17. What is the average power required to lift a mass of 100 kg to a height of 50 m in 50 seconds?
    • A. 100 J
    • B. 980 Watts
    • C. 50 Watts
    • D. 5000 Watts
      Answer: B
  18. If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is:
    • A. Double
    • B. Constant
    • C. Reduced to a quarter
    • D. Reduced by half
      Answer: C
  19. A body starts from rest and moves with uniform acceleration of 6 m/s². What distance does it cover in the third second?
    • A. 18 m
    • B. 15 m
    • C. 27 m
    • D. 30 m
      Answer: B
  20. The density of 400 cm³ of palm oil was 0.9 g/cm³ before frying. If the density of the oil was 0.6 g/cm³ after, assuming no loss of oil due to spilling, its new volume will be:
    • A. 360 cm³
    • B. 600 cm³
    • C. 240 cm³
    • D. 450 cm³
      Answer: B
  21. If the moment of inertia of a sphere about its center is I=25mα2I = \frac{2}{5} m\alpha^2I=52​mα2, calculate the radius of gyration in terms of α\alphaα:
    • A. 2.5α2.5\alpha2.5α
    • B. 0.63α0.63\alpha0.63α
    • C. 0.5α0.5\alpha0.5α
    • D. 3.6α3.6\alpha3.6α
      Answer: B
  22. What happens to the kinetic energy of a moving object if the net work done is positive?
    • A. It increases
    • B. It decreases
    • C. It remains the same
    • D. It is zero
      Answer: A
  23. The time taken by a train to slow down from 80 km/hr to 20 km/hr with a uniform deceleration of 2 m/s² is:
    • A. 9 s
    • B. 10 s
    • C. 8.3 s
    • D. 8 s
      Answer: C
  24. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the external force?
    • A. 400 J
    • B. -400 J
    • C. 0 J
    • D. 50 J
      Answer: A
  25. The physical quantity whose dimensional formula is M1L0T−2M^1L^0T^{-2}M1L0T−2 is:
    • A. Bulk modulus
    • B. Electric conductance
    • C. Surface tension
    • D. Force
      Answer: C
  26. The equation of continuity for the streamline flow of fluid can be expressed as:
    • A. A1V1=A2V2A_1V_1 = A_2V_2A1​V1​=A2​V2​
    • B. A12V12=A22V22A_1^2V_1^2 = A_2^2V_2^2A12​V12​=A22​V22​
    • C. A12V1=A22V2A_1^2V_1 = A_2^2V_2A12​V1​=A22​V2​
    • D. A2V2=A1V1A^2V^2 = A_1V_1A2V2=A1​V1​
      Answer: A
  27. The work done by gravitational force when an object of weight 50 kg on a floor moves through a distance of 3 m is:
    • A. 500 J
    • B. 150 J
    • C. 0 J
    • D. 1500 J
      Answer: C
  28. The bulk modulus of elasticity is given by k=−VΔpΔvk = -\frac{V\Delta p}{\Delta v}k=−ΔvVΔp​; the minus in the expression indicates:
    • A. Increase in pressure
    • B. Decrease in pressure
    • C. Increase in volume
    • D. Decrease in volume
      Answer: D
  29. The load that stretches a wire is called:
    • A. Tensile load
    • B. Tensile force
    • C. Tensile stress
    • D. Tensile strain
      Answer: B
  30. The moment of force is known as:
    • A. Torque
    • B. Couple
    • C. Inertia
    • D. Momentum
      Answer: A
  31. A particle moving in a circular path with a constant speed is said to have:
    • A. Zero acceleration
    • B. Uniform acceleration
    • C. Centripetal acceleration
    • D. Angular momentum
      Answer: C
  32. The unit of work done in joules is equivalent to:
    • A. kg·m/s
    • B. kg·m²/s²
    • C. N·m
    • D. All of the above
      Answer: D
  33. A projectile is launched at an angle of 30° to the horizontal. What is the shape of its trajectory?
    • A. Circle
    • B. Parabola
    • C. Ellipse
    • D. Straight line
      Answer: B
  34. What is the potential energy of a 2 kg mass at a height of 10 m? (Use g = 9.8 m/s²)
    • A. 98 J
    • B. 196 J
    • C. 20 J
    • D. 80 J
      Answer: B
  35. In a vacuum, all objects fall with the same acceleration due to:
    • A. Gravity
    • B. Mass
    • C. Air resistance
    • D. Weight
      Answer: A
  36. The force that opposes the motion of a body through a fluid is known as:
    • A. Friction
    • B. Drag
    • C. Lift
    • D. Thrust
      Answer: B
  37. The Law of Conservation of Energy states that:
    • A. Energy can be created or destroyed
    • B. Energy cannot be created or destroyed
    • C. Energy is always lost as heat
    • D. None of the above
      Answer: B
  38. Which of the following quantities is conserved in an elastic collision?
    • A. Kinetic energy
    • B. Momentum
    • C. Both A and B
    • D. None of the above
      Answer: C
  39. The phenomenon of light bending when it passes from one medium to another is called:
    • A. Reflection
    • B. Refraction
    • C. Diffraction
    • D. Dispersion
      Answer: B
  40. The first law of thermodynamics is a statement of:
    • A. Conservation of mass
    • B. Conservation of energy
    • C. Conservation of momentum
    • D. None of the above
      Answer: B
  41. A wave that requires a medium to travel is called a:
    • A. Electromagnetic wave
    • B. Mechanical wave
    • C. Longitudinal wave
    • D. Transverse wave
      Answer: B
  42. The speed of sound is highest in:
    • A. Solids
    • B. Liquids
    • C. Gases
    • D. Vacuum
      Answer: A
  43. The unit of frequency is:
    • A. Hertz (Hz)
    • B. Joule (J)
    • C. Newton (N)
    • D. Watt (W)
      Answer: A
  44. A current-carrying conductor in a magnetic field experiences:
    • A. No force
    • B. A magnetic force
    • C. An electric force
    • D. Both A and C
      Answer: B
  45. The energy stored in a stretched or compressed spring is known as:
    • A. Kinetic energy
    • B. Elastic potential energy
    • C. Gravitational potential energy
    • D. Thermal energy
      Answer: B
  46. The center of mass of a system of particles is defined as:
    • A. The point where all mass is concentrated
    • B. The average position of all particles
    • C. The point of balance
    • D. All of the above
      Answer: D
  47. In a lever, the distance from the fulcrum to the point where the force is applied is called:
    • A. Effort arm
    • B. Load arm
    • C. Moment arm
    • D. Distance arm
      Answer: A
  48. The work done by a force is maximum when:
    • A. The angle between force and displacement is 0°
    • B. The angle between force and displacement is 90°
    • C. The angle between force and displacement is 180°
    • D. There is no displacement
      Answer: A
  49. The total mechanical energy of a system is the sum of:
    • A. Kinetic energy and thermal energy
    • B. Potential energy and thermal energy
    • C. Kinetic energy and potential energy
    • D. Kinetic energy and work done
      Answer: C
  50. The acceleration due to gravity decreases as:
    • A. You move away from the Earth’s surface
    • B. You move towards the Earth’s surface
    • C. You increase your weight
    • D. You increase your speed
      Answer: A

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