General Physics I — integral Past Questions

University of Ilorin PHY101: 22 questions.

Topics: Units and Dimension, Kinematics, Rotational motion, Gravitation, Conservation Principles in Physics, Vectors and Scalars, Newton's Law of Motion, Circular motion

1. Which of the following is also the SI Unit of viscosity?
   1. kg·m²/s
   2. kg·s/m²
   3. N/m²
   4. kg/(s²·m)
2. A body moving at a speed of 30 m/s to 45 m/s finally in 5 seconds, calculate the acceleration of the body.
   1. 60 m/s²
   2. 6 m/s²
   3. 12 m/s²
   4. 5 m/s²
3. Which of the following is not correct about Collision?
   1. For inelastic collision, K.Ei = K.Ef
   2. For elastic collision, the Momentum is conserved
   3. For elastic collision, K.Ei = K.Ef
   4. For inelastic collision, Momentum is conserved
4. For an object undergoing circular motion, the force which keeps it moving in a circular path is called?
   1. Centrifugal Force
   2. Centripetal Force
   3. Circular Force
   4. Rotational Force
5. Which Kepler’s law helps us to discover if stars have planets?
   1. First Law
   2. Second Law
   3. Third Law
   4. None
6. Calculate the range of a ball projected at angle 30 degrees to the horizontal at a speed of 20 m/s.
   1. 35.34 m
   2. 30 m
   3. 25.4 m
   4. 40 m
7. The SI Unit of Surface tension is
   1. N/m
   2. N·m
   3. N·m²
   4. kg·m
8. The formula for time of flight is given as
   1. T = (U sinθ)/g
   2. T = (2U sinθ)/g
   3. T = (U sinθ)/2g
   4. T = (U sin²θ)/g
9. 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 centre 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
10. A 300g mass at the end of a spring executes SHM with a period of 2.4 secs, find the period of oscillation of a 133g mass attached to the same spring.
    1. 1.6 s
    2. 1.5 s
    3. 1.7 s
    4. 1.8 s
11. A diver makes 2.5 revolutions on the way from a 10m high platform to the water. Assuming zero vertical velocity, find the diver’s average angular velocity during a dive.
    1. 12 rad/s
    2. 13 rad/s
    3. 11 rad/s
    4. 20 rad/s
12. Which is not a unit of power?
    1. Horsepower
    2. Watts
    3. kg·m²/s²
    4. kg·s/m²
13. The area under the force-displacement curve equals
    1. Energy
    2. Work done
    3. Power
    4. None of the above
14. Which of the following is correct about moment of inertia and mass? i. Moment of inertia is for a rotational rigid body while mass is for linear motion. ii. Unit of inertia is kg·m² while mass is kg. iii. Inertia is constant while mass varies.
    1. All are correct
    2. i and ii
    3. i
    4. ii and iii
15. Dimension Analysis is used for the following except
    1. Derive formula
    2. Correctness of a formula
    3. None of the above
    4. All of the above
16. A body with initial velocity of 135 m/s was projected at an angle of 45°. What is the time taken to reach maximum height?
    1. 7.8 s
    2. 9.74 s
    3. 9.81 s
    4. 6.78 s
17. Two pieces each weighing 100 kg are separated by a distance of 5 m, calculate the gravitational force of attraction between them.
    1. 2.66 × 10⁻⁸ N
    2. 2.66 × 10⁸ N
    3. 1.33 × 10⁻⁸ N
    4. 0.26 × 10⁻⁸ N
18. What is the gravitational PE of the Moon-Earth system? The masses of Earth and Moon are 5.98 × 10²⁴ kg and 7.36 × 10²² kg respectively, and their mean separation is 3.82 × 10⁸ m.
    1. 7.6 × 10²⁷ J
    2. 76.7 × 10²⁴ J
    3. 76.7 × 10²⁶ J
    4. None of the above
19. If two masses, 1g and 4g, have the same Kinetic energy. Calculate the ratio of the linear momentum of the two masses.
    1. 1:16
    2. 1:4
    3. 1:2
    4. 1:8
20. A fan rotates at an angular frequency of 900 rpm. If the distance from the center to the end of the arm of a blade is 20 cm, calculate its tangential velocity.
    1. 171.89 m/s
    2. 127.60 m/s
    3. 160.59 m/s
    4. 133.33 m/s
21. Two forces act at a point: 10N along the positive y-axis and 15N along the positive x-axis. What is the magnitude and direction of the resultant force?
    1. 18N, 33.7°
    2. 18N, 45°
    3. 19N, 33.7°
    4. 19N, 45°
22. Two forces act at a point: 60N North and 40N East. What is the magnitude and direction of the resultant force?
    1. 72.11N, 56.31°
    2. 83N, 56.31°
    3. 72.11N, 45°
    4. 100N, 45°

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