Physics Exam

31. Vector quantities are represented by

A. direction only.
B. magnitude and direction.
C. dimensionless values.
D. magnitude only.

32. According to Newton's first law, an object that is in motion continues its state of motion with

A. constant velocity if the resultant force exerted on it is not zero.
B. a decreasing speed if the resultant force exerted on it is zero.
C. constant velocity if the resultant force exerted on it is zero.
D. an increasing speed if the resultant force exerted on it is not zero.

33. Which of the following correctly describes the difference between distance and displacement?

A. Distance depends on the initial and final points, while displacement depends on the path followed by a moving body.
B. Distance can be described both in magnitude and direction, while displacement is described only by magnitude.
C. Distance has either positive or negative values, while displacement has only positive value.
D. Distance is always greater than or equal to the magnitude of displacement, while the magnitude of the displacement is always less than or equal to distance.

34. Which of the following statements is correct about a uniformly accelerated motion?

A. The acceleration is constant.
B. The velocity is constant.
C. The displacement increases at a uniform rate.
D. The speed is constant but the direction is changing.

35. Two displacement vectors have magnitudes 4 m and 3 m. Which one of the following is NOT the possible value of the magnitude of their resultant vector?

A. 7 m
B. 1 m
C. 12 m
D. 5 m

36. A train is moving along a straight line with a constant acceleration of 5 m/s² when it passes by a traffic light point. From there on, if the time taken by the train to reach a velocity of 30 m/s is 4 seconds, then what is the distance of the train from the traffic point after 8 seconds?

A. 160 m
B. 80 m
C. 320 m
D. 240 m

37. An electric field is defined as a region where

A. a neutral particle experiences electric force when it is placed in that region.
B. a charged particle experiences an electric force if it is placed in that region.
C. a charged particle loss its charge when it is placed in that region.
D. a charged particle experiences no electric force when it is placed in that region.

38. Which one of the following statements is correct about the speed of sound in different medium? The speed of sound

A. increases as the temperature and density of a material increases.
B. in liquid is less than its speed in gas.
C. in a colder and less dense medium is faster than in hotter and denser material.
D. in solid is less than its speed in liquid.

39. Four resistors are connected to a voltage source as shown in the figure below. Which one of the following is correct about the circuit?

A. R₁, is connected in series with the effective combination of R₃, and R₄
B. R₂ is connected in parallel with the effective combination of R₃, and R₄
C. R₂ is connected in parallel with R₃.
D. R₁, is connected in parallel with R₂.

40. What is the magnitude of electric field strength at a distance of 2.0 m from a point charge, Q = 4.0 C?

A. 54.0 × 10⁹ N/C
B. 18.0 × 10⁹ N/C
C. 9.0 × 10⁹ N/C
D. 72.0 × 10⁹ N/C

41. A wire that has a resistance of 6 Ω is drawn out so as to make it into a new wire two times as long as the original and half cross-sectional area of the original. What will be the resistance of the new wire?

A. 3Ω
B. 24 Ω
C. 12 Ω
D. 6 Ω

42. A long straight wire carries a current of 5.0 A. What is the magnetic field strength produced by the current at a distance of 2.0 cm from the wire? (Magnetic permeability free space μo= 4π × 10^-7 Tm/A)

A. 20 × 10^-5 T
B. 5 × 10^-5 T
C. 5π × 10^-5 T
D. 20π × 10^-5 T

43. The flow rate of a fluid is defined as

A. the mass of the fluid crossing an area per unit time taken.
B. the speed with which the fluid flowing through a pipe.
C. the rate of change of the speed with which fluid flowing through a pipe.
D. the volume of the fluid crossing an area per unit time taken.

44. At normal condition, solids are almost incompressible compared to liquids and gases. The reason is that

A. their atoms vibrate and free to move.
B. there is much space and little force between atoms.
C. their atoms are free to slide about and interact with neighbors.
D. their atoms are relatively fixed distance apart and held together.

45. Which of the following statements is correct about magnets?

A. Unlike permanent magnets, electromagnets are magnets without poles.
B. If you cut a bar magnet into two, each piece has both north and south poles.
C. The north pole of one magnet repels the south pole of another magnet.
D. Like electric charges, magnetic poles exist in a single isolated form.

Physics Exam: Part 3

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