General Physics I — 2022 Past Questions

University of Ilorin PHY101: 53 questions.

Topics: Units and Dimension, Kinematics, Conservation Principles in Physics, Newton's Law of Motion, Rotational Motion, Work and Energy, Application of Newtonian Mechanics, Vectors and Scalars, Circular Motion

1. Which of the following is the fundamental unit for power?
   1. Watts
   2. kg·m²·s⁻³
   3. Horsepower
   4. Joule/second
2. Fundamental unit for pressure is:
   1. N·m⁻²
   2. Torr
   3. Pascal
   4. kg·m⁻¹·s⁻²
3. Which of the following is a unit of impulse?
   1. N·s
   2. kg·m/s
   3. Joule-second
   4. Pascal-second
4. A spring makes 2 complete oscillations per second with a 2 kg mass. If the spring constant is 360 N/m, find its mass (for the given system).
   1. 1.2 kg
   2. 0.2 kg
   3. 0.3 kg
   4. 3.6 kg
5. A ball is thrown upward from 40 m height at 30 m/s. Calculate total time of flight.
   1. 6.24 s
   2. 7.34 s
   3. 10 s
   4. 12 s
6. Which unit of pressure is equivalent to 1 N/m²?
   1. 1 Torr
   2. 1 bar
   3. 1 atm
   4. 1 Pascal
7. Which of these is not a fundamental unit?
   1. Radian
   2. Steradian
   3. Mole
   4. Tesla
8. What is the dimension of energy?
   1. [ML²T⁻²]
   2. [MLT⁻²]
   3. [ML²T⁻¹]
   4. [MT⁻²]
9. Which of the following is a type of contact force?
   1. Gravitational force
   2. Magnetic force
   3. Frictional force
   4. Electrostatic force
10. Which is not a natural force?
    1. Gravitational force
    2. Electromagnetic force
    3. Strong nuclear force
    4. Radioactive force
11. A 20 g ball is thrown from 40 m height at 30 m/s. Find its potential energy at maximum height.
    1. 17 J
    2. 19 J
    3. 45 J
    4. 8 J
12. Which statement about collisions is incorrect?
    1. Momentum is conserved in elastic collisions
    2. Momentum is conserved in inelastic collisions
    3. In elastic collisions, KE_final = KE_initial
    4. In inelastic collisions, KE_final = KE_initial
13. If vectors A, B, and C are in equilibrium with A and B at right angles, find the angle C makes with A or B.
    1. 40°
    2. 135°
    3. 45°
    4. 60°
14. Which of the following is dimensionless?
    1. Coefficient of friction
    2. Energy
    3. Power
    4. Gravitational constant
15. Which has the dimension [MLT]?
    1. Power
    2. Work
    3. Energy
    4. None of the above
16. A body accelerates uniformly at 10 m/s² for 10 s. What distance is covered in the last second?
    1. 500 m
    2. 95 m
    3. 250 m
    4. 100 m
17. For a body in SHM (points P, Q, R), which statement is false?
    1. PE is minimum at P and R (extremes)
    2. KE is maximum at Q (equilibrium)
    3. Acceleration is maximum at extremes
    4. Velocity is zero at extremes
18. Which is not a unit of length?
    1. Light-year
    2. Astronomical unit
    3. Foot
    4. Tonnes
19. Which property cannot apply to a positive velocity-time graph?
    1. It can also be negative
    2. It indicates constant acceleration
    3. It represents motion in +x direction
    4. Its slope gives acceleration
20. Which is the odd one out?
    1. Solid angle
    2. Temperature
    3. Density
    4. Time
21. A 2 kg mass on a 30° inclined plane experiences 6 N friction. Calculate its acceleration down the plane.
    1. 4 m/s²
    2. 2 m/s²
    3. 6 m/s²
    4. 3 m/s²
22. A 4 m rope completes 12 vertical circles per second. Calculate the speed.
    1. 96 m/s
    2. 150.8 m/s
    3. 301.6 m/s
    4. 48π m/s
23. Given V = kTᵃmᵇLᶜ depends on tension (T), mass (m), and length (L), find exponents a, b, c.
    1. a=½, b=-½, c=½
    2. a=½, b=½, c=-½
    3. a=½, b=-1, c=½
    4. a=1, b=-½, c=½
24. If the period (T) varies as mass (m), length (l) and acceleration due to gravity (g) such that T ∝ mˣlʸgᶻ, find the values of x, y, and z.
    1. x=0, y=½, z=-½
    2. x=0, y=1, z=-½
    3. x=1, y=½, z=-½
    4. None of the above
25. What is the measure of inertia?
    1. Mass
    2. Weight
    3. Volume
    4. Density
26. Given forces (5.5Ni + 2.2Nj), (4.0Ni + 6.0Nj), and (2.5Ni + 6.0Nj) act on a 0.75g mass. Find acceleration.
    1. 12.4×10³ m/s²
    2. 16.0×10³ m/s²
    3. 22.8×10³ m/s²
    4. 30.2×10³ m/s²
27. What is the SI unit for moment of inertia?
    1. kg/m²
    2. kgm²
    3. Nm
    4. J/s
28. What is the equation for maximum height in projectile motion?
    1. h = u²/2g
    2. h = ut + ½gt²
    3. h = u²sin²θ/2g
    4. h = v²/2a
29. What is the dimension for moment of inertia?
    1. [ML]
    2. [ML²]
    3. [MLT⁻²]
    4. [ML⁻¹T⁻²]
30. Which is NOT among the standard equations of motion?
    1. v² = u² + 2as
    2. s = (v+u) × t
    3. s = ut + ½at²
    4. v = u + at
31. How is the magnitude of a vector represented?
    1. {} brackets
    2. () parentheses
    3. || symbols
    4. [] brackets
32. Which of these is NOT a representation of Newton's second law of motion?
    1. F = ma
    2. F = mg
    3. a = dv/dt
    4. All are valid representations
33. Which of the following is NOT a unit of time?
    1. Year
    2. Tonnes
    3. Astronomical unit
    4. Seconds
34. What is the range when a projectile is launched at θ=45° for maximum range?
    1. u²/g
    2. u²/2g
    3. 2u²/g
    4. u²sinθ/g
35. Dimensional analysis helps to:
    1. Derive equations
    2. Check consistency of equations
    3. Convert between units
    4. All of the above
36. A mango falls from a tree (g=10 m/s²) through 10 m. Find time of fall.
    1. 1.00 s
    2. 1.43 s
    3. 2.00 s
    4. 2.86 s
37. What is the dimension of power?
    1. [MLT⁻³]
    2. [ML⁻²T⁻³]
    3. [ML²T⁻³]
    4. [MLT⁻²]
38. The SI unit of coefficient of viscosity is:
    1. N·s
    2. Pa·s
    3. kg·N
    4. N/m²
39. What is the unit of energy?
    1. Metre
    2. Joules
    3. Kilogram
    4. Watt
40. What is the unit of surface tension?
    1. N/m
    2. N·m
    3. J/m²
    4. Pa·s
41. What is the dimension for viscosity?
    1. [ML⁻¹T⁻¹]
    2. [MLT⁻²]
    3. [ML²T⁻²]
    4. [MT⁻²]
42. A 15N force at 30° moves a car 12m along its direction. Calculate work done.
    1. 90 J
    2. 156 J
    3. 180 J
    4. 125 J
43. A 5g stone thrown vertically at 20m/s. What is its KE at maximum height?
    1. 0 J
    2. 0.5 J
    3. 1 J
    4. 2 J
44. A 0.02kg object thrown to 40m returns to ground. Find KE at projection point (g=10m/s²).
    1. 4 J
    2. 6 J
    3. 8 J
    4. 10 J
45. A spring (k=5N/mm) with 0.3kg mass stretches 0.15m, then displaced 0.1m. Find max velocity.
    1. 0.41 m/s
    2. 0.58 m/s
    3. 0.81 m/s
    4. 1.00 m/s
46. What is the dimension of energy?
    1. [ML²T⁻²]
    2. [MLT⁻²]
    3. [MT⁻²]
    4. [ML⁻¹T⁻²]
47. What is the unit of power?
    1. Watt
    2. kg·m²/s³
    3. Both A and B
    4. Joule
48. Calculate maximum friction to prevent 2kg mass from slipping on 30° incline (g=10m/s²).
    1. 7 N
    2. 9 N
    3. 10 N
    4. 8 N
49. A 15N northward force acts on car moving east 5m. Calculate work done.
    1. 10 J
    2. 3 J
    3. 0 J
    4. 45 J
50. A 4m thread whirled at 12 circles/second. Find stone's speed.
    1. 50.5 m/s
    2. 49.98 m/s
    3. 301.6 m/s
    4. 741.2 m/s
51. A mango drops from 10m branch. Velocity at ground impact? (g=10m/s²)
    1. 10√2 m/s
    2. √2 m/s
    3. √2/10 m/s
    4. 10/√2 m/s
52. 50N force acts on 2kg mass over 2m. Calculate work done.
    1. 50 J
    2. 75 J
    3. 100 J
    4. 125 J
53. Mass=2kg, spring constant=5N/mm. Find spring extension.
    1. 1.96 mm
    2. 3.92 mm
    3. 5.88 mm
    4. 7.84 mm

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