CHOOSE THE CORRECT ANSWER: 1. Change in position is called: a) displacement b) equations c) acceleration d) speed 2. A nanosecond is: a) 10 9 s b) 10 −9 s c) 10 −10 s d) 10 10 s 3. A gram is: a) 10 −6 kg b) 10 3 kg c) 1 kg d) 10-3 kg 4. km / h2 is a unit of; a) velocity b) speed c) acceleration d) distance 5. A square with an edge of exactly 1 cm has an area of: a)10 −6 m2 b) 10 −4 m2 c) 10 2 m2 d) 10 4 m2 6. A car starting from rest has a constant acceleration of 4 m/s 2 . How fast is it traveling after 5 seconds? a) 100 m/s b)50 m/s c) 20 m/s d)10 m/s 7. The average speed of a moving object during a given interval of time is always: a) The magnitude of its average velocity over the interval b) the distance covered during the time interval divided by the time interval c) one-half its speed at the end of the interval d) its acceleration multiplied by the time interval 8. An object moves with a constant velocity of 9.8 m/s, its acceleration in m/s 2 is; a) 9.8 b) 98 c) 0 d) -9.8 9. In which of the following statements the acceleration is constant? a) v = - 4t + 3t2 b) v = 2t + 3 c) v = 6 +2t – 4t3 d) v = 5t4 Model A Page 1 10. A particle moves along the x axis from x1 to x2. Of the following values of the x1 and x2, which results in the displacement with the largest magnitude? a) b) c) d) x1 4m -4m -4m -4m x2 6m -8m 2m 4m 11. The position of an object is given as a function of time by x = 4t − 3t2, where x is in m and t is in seconds. Its average velocity over the interval from t = 0 to t = 2s is: a) 0 b) −2m/s c) 2m/s d) −4m/s 12. How long will it take for a falling object to reach velocity of – 108 m/s if its initial velocity is –10 m/s a) 98 s b) 118 s c) 0.093 s d)10 s 13. Each of four particles move along an x axis. Their coordinates (in meters) as functions of time (in seconds) are given by; particle 1: x(t) = 3.5 − 2.7t3 particle 2: x(t) = 3.5 +2.7t 3 particle 3: x(t) = 3.5 +2.7t 2 particle 4: x(t) = 3.5 − 3.4t − 2.7t2 Which of these particles have constant acceleration? a) All four b) Only 1 and 2 c) Only 2 and 3 d) Only 3 and 4 14. A car, initially at rest, travels 20 m in 4 s along a straight line with constant acceleration. The acceleration of the car is: a) 0.4m/s 2 b) 1.3m/s 2 c) 2.5m/s 2 d) 4.9m/s 2 15. You are throwing a ball straight up in the air. At the highest point, the ball’s a) Velocity and acceleration are zero. b) Velocity is nonzero but its acceleration is zero c) Acceleration is nonzero, but its velocity is zero d) Velocity and acceleration are both nonzero 16. The Associative law is given as; a) b) c) d) Model A Page 2 17. If = (6m) − (8 m) then has magnitude: a) 10 m b) 20 m c) 30 m 18. The angle between a) 29 o c) 40 m = (25 m) + (45 m) and the positive x axis is: b) 61 o c) 151o d) 209 o 19. The scalar products of P 2i 5 j and a) b) c) Q 3i 4 j is d) 20. If a =10 units, b = 20 units and φ= 60 0 , c a b a) c = 200 b) c = 173.2 c) c = zero d) c = 100.4 21. If . Then; a) R and S are perpendicular b) R and S are in the same direction c) R and S are in the opposite direction d) The angle between R and S is 60 o 22. If the components of ax =6m ay=5m the direction of a is: a) 56.4 0 b) 900 c) 180 0 d) 39.8 o 23. The position of a particle is given by x = 2t2 - t3, its velocity will be zero at time: a) t=4/3 s b) 2/3 s c) 1/3 s d) 3/2 s 24. The vector − is: a) greater than in magnitude b) in the same direction as 25. Let = (2m) +(6 m) −(3 m) and = + is: a) (6 m) + (8 m) − (2 m) b) (−2m) + (4 m) − (4 m) c) (2 m) − (4 m) + (4 m) d) (8 m) + (12 m) − (3 m) c) less than in magnitude d) in the direction opposite to = (4m) +(2 m) +(1m) . The vector sum = (2m) + (6 m) − (3 m) and = (4m) + (2 m) + (1 m) . Then a) (8 m) + (12 m) − (3 m) b) 23 m2 c) (12 m) − (14 m) − (20 m) d) 17 m2 27. Quantity that is defined as the rate of change of displacement: 26. Let Model A = Page 3 a) velocity b) acceleration c) distance d) speed 28. An object moving in the positive direction of the x-axis with a relation x(t) = 6 + t + 3t 2. The instantaneous velocity after 4 s is: a) 25 m/s b) 20 m/s c) 15 m/s d) 10 m/s 29. Two birds are flying directly towards each other at the same speed. If the first bird is flying at a velocity v, the velocity of the second bird a) v b) - v c) 2v d) /2 y 30. If a person walking from point A to B to C as shown in the figure. The magnitude of the displacement is C(6,5) a) 3m b) 4m c) 5m d) 6m A(2,2) 31. The value of a) zero · ( × ) is: b) +1 B(6,2) x c) −1 d) 3 32. The vector product of and vector produces a third vector a) Perpendicular to the plane that contain and . b) Parallel to the two vectors and . c) In the opposite direction of . d) In the opposite direction of . whose direction is: 33. If the initial velocity is 4 m/s and the final velocity is 10 m/s in 3 s. What is the average acceleration? a) 6 m/s2 b) 12 m/s2 c) 3 m/s2 d) 2 m/s2 Model A Page 4

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