General Physics I — 2023 Past Questions

University of Ilorin PHY101: 26 questions.

Topics: Conservation Principles in Physics, Newton's Law of Motion, Gravitation, Vectors and Scalars, Rotational Motion, Units and Dimension, Application of Newtonian Mechanics, Kinematics, System of Particles, Center of Mass

1. The angle which a force makes with an axis is
   1. Magnitude
   2. Component
   3. Direction
   4. Displacement
2. Given the radius (r) of a planet's orbit as 1.64 m, find its period (T). (Assume uniform circular motion under gravity)
   1. 1.2 s
   2. 2.6 s
   3. 3.8 s
   4. 4.1 s
3. Calculate the force given a mass of 10 kg, velocity of 8 m/s, and time of 5 s.
   1. 16 N
   2. 20 N
   3. 24 N
   4. 32 N
4. Which of these is true of friction?
   1. It depends on the area of the surface
   2. It depends on the nature of the surface
   3. It is greater in a static car than a moving car
   4. It is independent of normal force
5. Which of the following is true of an inelastic collision?
   1. Kinetic energy is not conserved
   2. Kinetic energy is conserved
   3. Momentum is not conserved
   4. Momentum is conserved but energy is lost
6. Given a period (T), mass (m), amplitude (A), and displacement (x), calculate the velocity at that displacement.
   1. v = Aω√(1 - x²/A²)
   2. v = ω√(A² - x²)
   3. v = 2π√(A² - x²)/T
   4. v = (2π/T)√(A² - x²)
7. Given a force (F), mass (m), and acceleration (a), which of these properties is constant?
   1. Force
   2. Mass
   3. Acceleration
   4. Velocity
8. Given T₁ and L₁, if the new length is quadrupled, find the new period.
   1. T₁
   2. 2T₁
   3. 4T₁
   4. √2 T₁
9. A ball is thrown vertically upward with an initial velocity of 20 m/s. Calculate the maximum height reached.
   1. 10.2 m
   2. 20.4 m
   3. 30.6 m
   4. 40.8 m
10. The dimension for latent heat is:
    1. [L²T⁻²]
    2. [ML²T⁻²]
    3. [MLT⁻²]
    4. [LT⁻¹]
11. In an inelastic collision, which of the following is NOT true?
    1. Momentum is conserved
    2. Kinetic energy is lost
    3. K.E initial = K.E final
    4. Total energy is conserved
12. If the mass of an object is quadrupled, its period will:
    1. Remain the same
    2. Double
    3. Halve
    4. Increase by 4x
13. The magnitude of a unit vector is:
    1. Zero
    2. Unity
    3. Infinity
    4. Variable
14. Friction depends on:
    1. Area of contact
    2. Nature of surfaces
    3. Velocity of motion
    4. All of the above
15. The period of a pendulum varies with:
    1. Amplitude
    2. Mass
    3. Length
    4. All of the above
16. Momentum is given by p = 4t² + 6. Find the force when t = 4 s.
    1. 16 N
    2. 32 N
    3. 48 N
    4. 64 N
17. What is the result of the cross product 5j × 4i?
    1. 20k
    2. -20k
    3. 0
    4. 20i
18. A bullet of mass 4 kg moving at 4 m/s hits a lead block of mass 8 kg. Calculate the velocity after the collision (assume inelastic).
    1. 0.5 m/s
    2. 1.33 m/s
    3. 2.0 m/s
    4. 3.5 m/s
19. Find the distance between an artificial satellite (150 kg) and Earth if the gravitational force is 6.5 N. (Given: G = 6.67 × 10⁻¹¹ Nm²/kg², M_Earth = 5.98 × 10²⁴ kg, R_Earth = 6.37 × 10⁶ m)
    1. 1.23 × 10⁷ m
    2. 2.45 × 10⁷ m
    3. 3.68 × 10⁷ m
    4. 4.90 × 10⁷ m
20. The mechanics that deal with the motion of objects and the action of the forces that causes them is called?
    1. Kinematics
    2. Dynamics
    3. Reaction
    4. None of the above
21. What is the dimension of latent heat?
    1. [L²T²]
    2. [L²T⁻²]
    3. [L⁻²T⁻²]
    4. [L⁻²T²]
22. If water enters a pipe at 0.2 kg per second with 200 m/s velocity, calculate the force exerted.
    1. 40 N
    2. 38 N
    3. 45 N
    4. 50 N
23. The dimension of viscosity is:
    1. [MLT]
    2. [M⁻¹LT]
    3. [ML⁻¹T⁻¹]
    4. [MT⁻¹]
24. A body launched from the surface of the Earth will have its maximum gravitational potential energy at:
    1. Just before it leaves the ground
    2. The highest point reached by the body
    3. The middle of its displacement
    4. None of the above
25. A man does work of 1000 J for 5 seconds. What is the power exerted?
    1. 200 W
    2. 100 W
    3. 800 W
    4. 500 W
26. Calculate the center of mass for: m₁ = 2 kg (x₁ = 0 m), m₂ = 1 kg (x₂ = 10 cm), and m₃ = 2 kg (x₃ = 20 cm).
    1. 10 cm
    2. None of the above
    3. 6 cm
    4. 5 cm

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