Multiple Choice Test For FPSC, PPSC, NTS, CSS
And Various Exams
Subject Physics Chapter # 4 Motion In 2 & 3 Direction
1. Velocity is defined as:
A. rate of change of position with time
B. position divided by time
C. rate of change of acceleration with time
D. a speeding up or slowing down
E. change of position
ans: A
2. Acceleration is defined as:
A. rate of change of position with time
B. speed divided by time
C. rate of change of velocity with time
D. a speeding up or slowing down
E. change of velocity
ans: C
3. Which of the following is a scalar quantity?
A. Speed
B. Velocity
C. Displacement
D. Acceleration
E. None of these
ans: A
4. Which of the following is a vector quantity?
A. Mass
B. Density
C. Speed
D. Temperature
E. None of these
ans: E
5. Which of the following is NOT an example of accelerated motion?
A. Vertical component of projectile motion
B. Circular motion at constant speed
C. A swinging pendulum
D. Earth’s motion about sun
E. Horizontal component of projectile motion
ans: E
6. A particle goes from x = -2m, y =3m, z =1m to x =3m, y = -1m, z = 4 m. Its
displacement is:
A. (1 m) ˆ i + (2 m) ˆ j + (5 m) k ˆ
B. (5 m) ˆ i (4 m) ˆ j + (3 m) k ˆ
C. (5 m) ˆ i + (4 m) ˆ j (3 m) k ˆ
D. (1 m) ˆ i (2 m) ˆ j (5 m) k ˆ
E. (5 m) ˆ i (2 m) ˆ j + (3 m) k ˆ
ans: B
7. A jet plane in straight horizontal ?ight passes over your head. When it is directly above you,
the sound seems to come from a point behind the plane in a direction 30? from the vertical.
The speed of the plane is:
A. the same as the speed of sound
B. half the speed of sound
C. three- ?fths the speed of sound
D. 0 . 866 times the speed of sound
E. twice the speed of sound
ans: B
8. A plane traveling north at 200 m / s turns and then travels south at 200 m / s. The change in its
velocity is:
A. zero
B. 200 m / s north
C. 200 m / s south
D. 400 m / s north
E. 400 m / s south
ans: E
9. Two bodies are falling with negligible air resistance, side by side, above a horizontal plane. If
one of the bodies is given an additional horizontal acceleration during its descent, it:
A. strikes the plane at the same time as the other body
B. strikes the plane earlier than the other body
C. has the vertical component of its velocity altered
D. has the vertical component of its acceleration altered
E. follows a straight line path along the resultant acceleration vector
ans: A
10. The velocity of a projectile equals its initial velocity added to:
A. a constant horizontal velocity
B. a constant verticalvelocity
C. a constantly increasing horizontal velocity
D. a constantly increasing downward velocity
E. a constant velocity directed at the target
ans: D
11. A stone thrown from the top of a tall building follows a path that is:
A. circular
B. made of two straight line segments
C. hyperbolic
D. parabolic
E. a straight line
ans: D
12. Identical guns ?re identical bullets horizontally at the same speed from the same height above
level planes, one on the Earth and one on the Moon. Which of the following three statements
is/are true?
I. The horizontal distance traveled by the bullet is greater for the Moon.
II. The ?ight time is less for the bullet on the Earth.
III. The velocity of the bullets at impact are the same.
A. III only
B. I and II only
C. I and III only
D. II and III only
E. I, II, III
ans: B
13. A bullet shot horizontally from a gun:
A. strikes the ground much later than one dropped vertically from the same point at the same
instant
B. never strikes the ground
C. strikes the ground at approximately the same time as one dropped vertically from the same
point at the same instant
D. travels in a straight line
E. strikes the ground much sooner than one dropped from the same point at the same instant
ans: C
14. A bomber lying in level with constant velocity releases a bomb before it is over the
target. Neglecting air resistance, which one of the following is NOT true?
A. The bomber is over the target when the bomb strikes
B. The acceleration of the bomb is constant
C. The horizontal velocity of the plane equals the vertical velocity of the bomb when it hits
the target
D. The bomb travels in a curved path
E. The time of flight of the bomb is independent of the horizontal speed of the plane
ans: C
15. An object is shot from the back of a railroad moving at 40 km / h on a straight horizontal
road. The launcher is aimed upward, perpendicular to the bed of the car . The object falls:
A. in front of the car
B. behind the car
C. on the car
D. either behind or in front of the car, depending on the initial speed of the object
E. to the side of the car
ans: C
16. A stone is thrown outward from the top of a 59 . 4-m high cli? with an upward velocity component of 19 . 5m / s. How long is stone in the air?
A. 4 . 00 s
B. 5 . 00 s
C. 6 . 00 s
D. 7 . 00 s
E. 8 . 00 s
ans: C
17. A large cannon is fired from ground level over level ground at an angle of 30? above the
horizontal. The muzzle speed is 980 m / s. Neglecting air resistance, the projectile will travel
what horizontal distance before striking the ground?
A. 4 . 3km
B. 8 . 5km
C. 43 km
D. 85 km
E. 170 km
ans: D
18. A boy on the edge of a vertical 20 m high throws a stone horizontally outward with a speed
of 20 m / s. It strikes the ground at what horizontal distance from the foot of the ? ? Use
g =10m / s2 .
A. 10 m
B. 40 m
C. 50 m
D. 50v5m
E. none of these
ans: B
19. A projectile is ?red from ground level over level ground with an initial velocity that has a
vertical component of 20 m / s and a horizontal component of 30 m / s. Using g =10m / s2 , the
distance from launching to landing points is:
A. 40 m
B. 60 m
C. 80 m
D. 120 m
E. 180 m
ans: D
20. An airplane makes a gradual 90? turn while flying at a constant speed of 200 m / s. The process
takes 20 . 0 seconds to complete. For this turn the magnitude of the average acceleration of the
plane is:
A. zero
2
B. 40 m / s
2
C. 20 m / s
2
D. 14 m / s
2
E. 10 m / s
ans: D
21. An airplane is flying north at 500 km/h. It makes a gradual 180? turn at constant speed,
changing its direction of travel from north through east to south. The process takes 40 s. The
average acceleration of the plane for this turn (in km/h·s) is:
A. 12 . 5km / h · s, north
B. 12 . 5km / h · s, east
C. 12 . 5km / h · s, south
D. 25 km / h · s, north
E. 25 km / h · s, south
ans: E
22. An object is moving on a circular path of radius p meters at a constant speed of 4 . 0m / s. The
time required for one revolution is:
A. 2 / p2 s
B. p2 / 2s
C. p / 2s
D. p2 / 4
E. 2 / p s
ans: B
23. A particle moves at constant speed in a circular path. The instantaneous velocity and instantaneous acceleration vectors are:
A. both tangent to the circular path
B. both perpendicular to the circular path
C. perpendicular to each other
D. opposite to each other
E. none of the above
ans: C
24. A stone is tied to a string and whirled at constant speed in a horizontal circle. The speed
is then doubled without changing the length of the string. Afterward.com the magnitude of the
acceleration of the stone is:
A. the same
B. twice as great
C. four times as great
D. half as great
E. one-fourth as great
ans: C
25. Two objects are traveling around different circular orbits with constant speed. They both have
the same acceleration but object A is traveling twice as fast as object B. The orbit radius for
object A is the orbit radius for object B.
A. one-fourth
B. one-half
C. the same as
D. twice
E. four times
ans: E
26. A stone is tied to a 0 . 50-m string and whirled at a constant speed of 4 . 0m / s in a vertical circle.
Its acceleration at the top of the circle is:
A. 9 . 8m / s ,up
B. 9 . 8m / s ,down
C. 8 . 0m / s ,down
D. 32 m / s ,up
E. 32 m / s ,down
ans: E
27. A stone is tied to a 0 . 50-m string and whirled at a constant speed of 4 . 0m / s in a vertical circle.
Its acceleration at the bottom of the circle is:
A. 9 . 8m / s ,up
B. 9 . 8m / s ,down
C. 8 . 0m / s ,up
D. 32 m / s ,up
E. 32 m / s ,down
ans: D
28. A car rounds a 20-m radius curve at 10 m / s. The magnitude of its acceleration is:
A. 0
B. 0 . 20 m / s2
C. 5 . 0m / s2
D. 40 m / s2
E. 400 m / s
ans: C
29. For a biological sample in a 1 . 0-m radius centrifuge to have a centripetal acceleration of 25g
its speed must be:
A. 11 m / s
B. 16 m / s
C. 50 m / s
D. 122 m / s
E. 245 m / s
ans: B
30. A girl jogs around a horizontal circle with a constant speed. She travels one fourth of a
revolution, a distance of 25 m along the circumference of the circle, in 5 . 0 s. The magnitude of
her acceleration is:
A. 0 . 31 m / s2
B. 1 . 3m / s2
C. 1 . 6m / s2
D. 3 . 9m / s2
E. 6 . 3m / s
ans: C
31. A stone is tied to the end of a string and is swung with constant speed around a horizontal
circle with a radius of 1 . 5 m. If it makes two complete revolutions each second, the magnitude
of its acceleration is:
A. 0 . 24 m / s2
B. 2 . 4m / s2
C. 24 m / s2
D. 240 m / s2
E. 2400 m / s
ans: D
32. A Ferris wheel with a radius of 8 . 0 m makes 1 revolution every 10 s. When a passenger is at
the top, essentially a diameter above the ground, he releases a ball. How far from the point on
the ground directly under the release point does the ball land?
A. 0
B. 1 . 0m
C. 8 . 0m
D. 9 . 1m
E. 16 m
ans: D
33. A boat is able to move through still water at 20 m / s. It makes a round trip to a town 3 . 0km
upstream. If the river flows at 5 m / s, the time required for this round trip is:
A. 120 s
B. 150 s
C. 200 s
D. 300 s
E. 320 s
ans: E
34. A boat is traveling upstream at 14 km / h with respect to a river that is ?owing at 6 km / h (with
respect to the ground). A man runs directly across the boat, from one side to the other, at
6km / h (with respect to the boat). The speed of the man with respect to the ground is:
A. 10 km / h
B. 14 km / h
C. 18 . 5km / h
D. 21 km / h
E. 26 km / h
ans: A
35. A ferry boat is sailing at 12 km / h30? W of N with respect to a river that is ?owing at 6 . 0km / h
E. As observed from the shore, the ferry boat is sailing:
A. 30 E of N
B. due N
C. 30 W of N
D. 45 E of N
E. none of these
ans: B
36. A motor boat can travel at 10 km/h in still water. A river ?ows at 5 km/h west. A boater
wishes to cross from the south bank to a point directly opposite on the north bank. At what
angle must the boat be headed?
A. 27 E of N
B. 30 E of N
C. 45 E of N
D. 60 E of N
E. depends on the width of the river
ans: B
37. Two projectiles are in flight at the same time. The acceleration of one relative to the other:
A. is always 9 . 8m / s2
B. can be as large as 19 . 8m / s
C. can be horizontal
D. is zero
E. none of these
ans: D
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