General Physics I — 2021 Past Questions

University of Ilorin PHY101: 28 questions.

Topics: Kinematics, Units and Dimension, Gravitation, Conservation Principles in Physics, Rotational motion, Circular motion, Newton's Law of Motion, System of particles, Center of mass

1. Two masses of 1g and 4g are moving with equal kinetic energy. The ratio of the magnitude of their linear momentum is
   1. 1:6
   2. 1:2
   3. 4:1
   4. 1:16
2. For an object undergoing circular motion, the force that keeps the object moving in a circular path is called
   1. centrifugal force
   2. centripetal force
   3. circular force
   4. rotational force
3. What is the acceleration due to gravity of a place where a simple pendulum of length 150.3m makes 100 cycles in 246.2 days?
   1. 2.46 m/s²
   2. 9.0 m/s²
   3. 10.15 m/s²
   4. 9.75 m/s²
4. Which one of these is not Newton’s law of motion?
   1. v = u + at
   2. v² = u² + 2as
   3. s = (v + u)t
   4. s = ut + ½at²
5. The displacement, θ, is
   1. The ratio of the length of arc to radius
   2. Ratio of radius to length of arc
   3. Length multiplied by radius
   4. Length divided by time
6. Which Kepler’s law helps us discover if stars have planets?
   1. First law
   2. Second law
   3. Third law
   4. Fourth law
7. Which of the following types of motion are oscillatory? i. A diving board when used by a diver. ii. The motion of the balance wheel of a wrist watch. iii. The motion of the turn-table of a record player. iv. The motion of the center of a ten kobo piece as it rolls down an inclined plane. v. The motion of the needle of a D.C. ammeter into which a low A.C. current is passed.
   1. i and ii
   2. i, ii and iii
   3. ii, iii and iv
   4. i, ii and v
8. A ballast bag is dropped from a balloon that is 300m above the ground and rising at 13 m/s. Find the maximum height reached by the bag.
   1. 308.6 m
   2. 301.4 m
   3. 115 m
   4. 315 m
9. A ball m₁ (4kg) and m₂ (6kg) are moving along the positive axis with velocities u₁ = 7.5 m/s and u₂ = 2.5 m/s. After collision, m₁ moves at 4 m/s. Calculate the total kinetic energy after collision.
   1. 112.15 J
   2. 143 J
   3. 52 J
   4. 103.1 J
10. What is the displacement covered by a moving vehicle at 320 km/h running for 2 hours 15 minutes?
    1. 72 km
    2. 720 km
    3. 7.2 km
    4. 7200 km
11. What is the distance at a point above the surface of the Earth where g is reduced to half? (Take radius of Earth as R)
    1. 0.02R
    2. 0.05R
    3. 0.431R
    4. 1.41R
12. What is the unit of energy?
    1. N·m·s⁻¹
    2. N·s²
    3. kg·m²·s⁻²
    4. kg·m·s⁻²
13. If energy E is directly proportional to mass M and velocity V, which of these represents a correct relationship?
    1. E = KMV
    2. E = KMV²
    3. E = KM/V
    4. E = K/MV
14. The resultant work done on a body is
    1. Its initial potential energy
    2. Its change in potential energy
    3. Its initial kinetic energy
    4. Its change in kinetic energy
15. Calculate the center of mass of a system with m₁ = 200g (y₁ = 35cm), m₂ = 150g (x₂ = 22cm), and m₃ = 450g (x₃ = 55cm).
    1. X-comp = 34.96 cm, Y-comp = 11.67 cm
    2. X-comp = 42.37 cm, Y-comp = 11.67 cm
    3. X-comp = 34.96 cm, Y-comp = 8.7 cm
    4. X-comp = 42.37 cm, Y-comp = 8.7 cm
16. The force required to keep an object in circular motion is
    1. centrifugal force
    2. centripetal force
    3. circular force
    4. rotational force
17. Kepler's law that states 'equal areas are swept in equal times' is
    1. 1st law
    2. 2nd law
    3. 3rd law
    4. 4th law
18. Calculate the horizontal distance if a ball is projected at 30° to the horizontal with 20 m/s.
    1. 20.4 m
    2. 35.34 m
    3. 40.8 m
    4. 10.2 m
19. The energy of a spring is E with an extension of 2 cm. Calculate the energy of a similar spring with an extension of 10 cm.
    1. 5E
    2. 10E
    3. 25E
    4. 50E
20. What is the unit of the coefficient of limiting friction?
    1. N·s
    2. kg·m²
    3. Unitless
    4. Pa·s
21. What is the unit of moment of inertia?
    1. kg·m²
    2. N·m
    3. J·s
    4. Pa·m²
22. What is the unit of viscosity?
    1. N·s/m²
    2. kg·m/s
    3. J·m
    4. W·s
23. What is the unit of surface tension?
    1. N/m
    2. kg·m/s²
    3. J/m²
    4. W/m
24. The formula for maximum height in projectile motion is
    1. v² sin²θ / 2g
    2. v sinθ / g
    3. v² sinθ / g
    4. 2v sinθ / g
25. Calculate the acceleration due to gravity of a spring that undergoes 100 cycles in 2.467 s. Its length is 150.3 cm.
    1. 9.75 m/s²
    2. 9.81 m/s²
    3. 10.15 m/s²
    4. 2.46 m/s²
26. The dimension of moment of inertia is
    1. ML²
    2. MLT⁻²
    3. ML⁻¹T⁻²
    4. MT⁻²
27. A particle undergoes a change in position from ○₁ to ○₂. This is called
    1. Angular displacement
    2. Angular acceleration
    3. Linear displacement
    4. Linear acceleration
28. Calculate the impulse of a body with a force of 40 N acting for 2 s.
    1. 20 N·s
    2. 40 N·s
    3. 80 N·s
    4. 160 N·s

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