Question

1. Motion is a process of (a) a change in time, (b) a change in position, (c) a change in weight, (d) a change in mass.

2. Which of the following is a scalar quantity? (a) force, (b) speed, (c) velocity,               (d) acceleration.

3. The time rate of change of velocity is (a) speed, (b) acceleration, (c) friction,            (d) force.

4. In addition to a magnitude, a vector quantity has (a) time, (b) direction,                 (c) length, (d) an average value.

5. Velocity (a) is a scalar quantity,(b) has no direction, (c) is a vector quantity,          (d) has the units of displacement.

6. Which of the following is a unit of acceleration? (a) km/s, (b) ft/s, (c) m/s2,            (d) cm/s .

7. All objects in free fall near the Earth’s surface have the same (a) velocity,              (b) speed, (c) acceleration, (d) weight.

8. Weight (a) is less in magnitude than an object’s mass, (b) is the same as mass,        (c) is a gravitational force, (d) has the units of kilos.

9. Mass is a measurement of (a) volume,(b) inertia, (c) force, (d) weight.                  

    10.For an object in free fall (a) the momentum is conserved, (b) there is zero net   force acting on it, (c) only the gravitational force is considered, (d) there is air resistance acting on it.

    11.If two equal and opposite forces act on an object, the object will (a) increase its inertia, (b) remain at rest or in uniform motion, (c) experience an unbalanced force,   (d) experience an acceleration.

    12.When the net force acting on an object increases, (a) its acceleration remains constant, (b) its velocity remains constant, (c) its speed is zero, (d) a change in speed and / or direction occurs.

     13. Work is equal to the (a) force times time, (b) mass times acceleration, (c) force times distance, (d) force divided by distance.

      14.The unit of work is (a) m/s, (b) N, (c) watt, (d) joule.

      15.The time rate of doing work is (a) momentum, (b) energy, (c) power, (d) force.

      16. The watt is a unit of (a) work, (b) momentum, (c) energy, (d) power.

      17. The energy of motion is called (a) potential, (b) inertial, (c) kinetic, (d) power.

      18. The energy of position is (a) work, (b) heat, (c) potential energy, (d) momentum.

      19.The impulse applied to an object is equal to the change in its (a) acceleration,          (b) velocity, (c) kinetic energy, (d) momentum.

       20. The impulse is equal to the (a) force times distance, (b) force times time, (c) mass times acceleration, (d) mass times velocity.

      21. The unit for angular acceleration in the metric system of units is (a) radians/s,        (b) m/s2, (c) degrees/s, (d) radians/s2.

     22. Newton’s second law of rotational motion states that torque equals (a) moment of inertia times angular velocity, (b) mass times distance, (c) angular velocity times time, (d) moment of inertia times angular acceleration.

     23. The perpendicular distance from the axis of rotation to a line along which a force acts is known as the (a) torque, (b) moment of inertia, (c) lever arm, (d) momentum.

     24. The time rate of change of angular velocity is known as angular (a) momentum,    (b) inertia, (c) acceleration, (d) velocity.

      25.The pressure in a liquid depends on (a) the weight density of the liquid, (b) the depth in the liquid, (c) the mass density of the liquid, (d) all of the preceding.

     26. The unit of pressure in the metric system is (a) pa/m, (b) Nm, (c) N/m2, (d) m/s.

     27.   Pressure may be decreased by (a) decreasing the force and area by the same factor, (b) decreasing the area of contact, (c) increasing the area of contact, (d) increasing the applied force.

     28. The buoyant force is described by (a) Bernoulli’s principle, (b) streamline flow,     (c) Pascal’s principle, (d) Archimedes’ principle.

       29. A mechanical advantage can be obtained by the application of (a) Archimedes’ principle, (b) Bernoulli’s principle, (c) surface tension, (d) Pascal’s principle.

       30. The rising of a hot air balloon is explained by (a) Pascal’s principle, (b) Bernoulli’s principle, (c) Archimedes’ principle, (d) none of these.

        31.The velocity of a car changes from 60 m/s to 45 m/s in 5 seconds. The magnitude of the car’s acceleration is (a) 21m/s2, (b) 35 m/s2, (c) 3m/s2, (d) 5m/s2.

        32.  A clam dropped by a sea gull takes 4 seconds to hit the ground. What is the sea gull’s height above the ground at the time the clam was dropped? (a) 90 m,           (b) 45 m , (c) 78 m, (d) 30 m.

         33. A single force of 63 N acts on a 7 kg block. What is the magnitude of the acceleration of the block? (a) 70 m/s2, (b) 9 m/s2, (c) 10 m/s2, (d) 5m/s2.

         34.  A net force of 15 N acting on a wooden block produces an acceleration of      3 m/s2 for the block. What is the mass of the block? (a) 18 kg, (b) 45 kg, (c) 5 kg,     (d) 12 kg.

         35.  A net force of 100 N accelerates a 20 kg block over a distance of 3 m. What is the work done by this net force? (a) 600 J, (b) 200 J, (c) 300 J, (d) 100 J.

        36. A 2 kg block is moving at a constant speed of 3 m/s. What is the kinetic energy of the block? (a) 6 J, (b) 12 J, (c) 9 J, (d) 18 J.

         37. A 7 N force imparts an impulse of 42 Ns to an object. The force acts on the object for a period of (a) 0.6 s, (b) 49 s, (c) 6s (d) 10 s.

          38.  What is the magnitude of the change in momentum produced when a force of 3 N acts on a 10 kg block for 5 seconds? (a) 1.5 kgm/s, (b) 3 kgm/s, (c) 50 kgm/s,          (d) 15kgm/s.

          39. A force of 30 N pushes down on the movable piston of a closed cylinder containing a gas. The piston’s area is 0.2m2. What pressure does this produce in the gas? (a) 6 pa, (b) 15 pa, (c) 60 pa, (d) 150 pa.  

           40. A block of wood of uniform density floats so that 35% of its volume is above water. The density of water is 1000 kg/m3. What is the density of the block?               (a) 350 kg/m3, (b) 750 kg/m3, (c) 650 kg/m3, (d) 150 kg/m3 .            

             

         

Answer 1