Download PHYSICS MCQ FOR BSCS STUDENTS and more Quizzes Physics in PDF only on Docsity!
Chapter 1: MEASUREMENT
- The SI standard of time is based on:
A. the daily rotation of the earth B. the frequency of light emitted by Kr^86 C. the yearly revolution of the earth about the sun D. a precision pendulum clock E. none of these Ans: E
- A nanosecond is:
A. 109 s B. 10 −^9 s C. 10 −^10 s D. 10 −^10 s E. 10 −^12 Ans: B
- The SI standard of length is based on:
A. the distance from the north pole to the equator along a meridian passing through Paris B. wavelength of light emitted by Hg^198 C. wavelength of light emitted by Kr^86 D. a precision meter stick in Paris E. the speed of light Ans: E
- In 1866, the U. S. Congress defined the U. S. yard as exactly 3600/3937 international meter. This was done primarily because: A. length can be measured more accurately in meters than in yards B. the meter is more stable than the yard C. this definition relates the common U. S. length units to a more widely used system D. there are more wavelengths in a yard than in a meter E. the members of this Congress were exceptionally intelligent Ans: C
- Which of the following is closest to a yard in length?
A. 0 .01 m B. 0 .1 m C. 1 m D. 100 m E. 1000 m Ans: C
Chapter 1: MEASUREMENT 1
- There is no SI base unit for area because: A. an area has no thickness; hence no physical standard can be built B. we live in a three (not a two) dimensional world C. it is impossible to express square feet in terms of meters D. area can be expressed in terms of square meters E. area is not an important physical quantity Ans: D
- The SI base unit for mass is: A. gram B. pound C. kilogram D. ounce E. kilopound Ans: C
- A gram is: A. 10 −^6 kg B. 10 −^3 kg C. 1 kg D. 103 kg E. 106 kg Ans: B
- Which of the following weighs about a pound? A. 0 .05 kg B. 0 .5 kg C. 5 kg D. 50 kg E. 500 kg Ans: D
- (5. 0 × 104 ) × (3. 0 × 106 ) =
A. 1. 5 × 109 B. 1. 5 × 1010 C. 1. 5 × 1011 D. 1. 5 × 1012 E. 1. 5 × 1013 Ans: C
- (5. 0 × 104 ) × (3. 0 × 10 −^6 ) =
A. 1. 5 × 10 −^3 B. 1. 5 × 10 −^1 C. 1. 5 × 101 D. 1. 5 × 103 E. 1. 5 × 105 Ans: B
2 Chapter 1: MEASUREMENT
A. 29
B. 28. 8
C. 28. 9
D. 28. 81
E. 28. 813
( )Ans: B
- 1 mi is equivalent to 1609 m so 55 mph is:
A. 15 m/s B. 25 m/s C. 66 m/s D. 88 m/s E. 1500 m/s Ans: B
- A sphere with a radius of 1.7 cm has a volume of:
A. 2. 1 × 10 −^5 m^3 B. 9. 1 × 10 −^4 m^3 C. 3. 6 × 10 −^3 m^3 D. 0 .11 m^3 E. 21 m^3 Ans: A
- A sphere with a radius of 1.7 cm has a surface area of:
A. 2. 1 × 10 −^5 m^2 B. 9. 1 × 10 −^4 m^2 C. 3. 6 × 10 −^3 m^2 D. 0 .11 m^2 E. 36 m^2 Ans: C
- A right circular cylinder with a radius of 2.3 cm and a height of 1.4 m has a volume of:
A. 0 .20 m^3 B. 0 .14 m^3 C. 9. 3 × 10 −^3 m^3 D. 2. 3 × 10 −^3 m^3 E. 7. 4 × 10 −^4 m^3 Ans: D
- A right circular cylinder with a radius of 2.3 cm and a height of 1.4 cm has a total surface area of: A. 1. 7 × 10 −^3 m^2 B. 3. 2 × 10 −^3 m^2 C. 2. 0 × 10 −^3 m^3 D. 5. 3 × 10 −^3 m^2 E. 7. 4 × 10 −^3 m^2 Ans: D
4 Chapter 1: MEASUREMENT
- A cubic box with an edge of exactly 1 cm has a volume of:
A. 10 −^9 m^3 B. 10 −^6 m^3 C. 10 −^3 m^3 D. 103 m^3 E. 106 m^3 Ans: B
- A square with an edge of exactly 1 cm has an area of:
A. 10 −^6 m^2 B. 10 −^4 m^2 C. 102 m^2 D. 104 m^2 E. 106 m^2 Ans: B
- 1 m is equivalent to 3.281 ft. A cube with an edge of 1.5 ft has a volume of:
A. 1. 2 × 102 m^3 B. 9. 6 × 10 −^2 m^3 C. 10 .5 m^3 D. 9. 5 × 10 −^2 m^3 E. 0 .21 m^3 Ans: B
- During a short interval of time the speed v in m/s of an automobile is given by v = at^2 + bt^3 , where the time t is in seconds. The units of a and b are respectively: A. m · s^2 ; m · s^4 B. s^3 /m; s^4 /m C. m/s^2 ; m/s^3 D. m/s^3 ; m/s^4 E. m/s^4 ; m/s^5 Ans: D
- Suppose A = BC, where A has the dimension L/M and C has the dimension L/T. Then B has the dimension: A. T/M B. L^2 /TM C. TM/L^2 D. L^2 T/M E. M/L^2 T Ans: A
Chapter 1: MEASUREMENT 5
Chapter 2: MOTION ALONG A STRAIGHT LINE
- A particle moves along the x axis from xi to xf. Of the following values of the initial and final coordinates, which results in the displacement with the largest magnitude? A. xi = 4 m, xf = 6 m B. xi = −4 m, xf = −8 m C. xi = −4 m, xf = 2 m D. xi = 4 m, xf = −2 m E. xi = −4 m, xf = 4 m ans: E
- A particle moves along the x axis from xi to xf. Of the following values of the initial and final coordinates, which results in a negative displacement? A. xi = 4 m, xf = 6 m B. xi = −4 m, xf = −8 m C. xi = −4 m, xf = 2 m D. xi = −4 m, xf = −2 m E. xi = −4 m, xf = 4 m ans: B
- 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 E. one-half its acceleration multiplied by the time interval. ans: B
- Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60 km/h and the other is moving at 40 km/h mph. In how many hours will they meet? A. 2. 5 B. 2. 0 C. 1. 75 D. 1. 5 E. 1. 25 ans: D
- A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. The average speed of the car for this 80-km trip is: A. 40 km/h B. 45 km/h C. 48 km/h D. 53 km/h E. 80 km/h ans: D
- A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip is: A. 0 B. 50 km/hr C. 100 km/hr D. 200 km/hr E. cannot be calculated without knowing the acceleration ans: A
- A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The average speed of the car for this round trip is: A. 0 B. 50 km/h C. 100 km/h D. 200 km/h E. cannot be calculated without knowing the acceleration ans: B
- The coordinate of a particle in meters is given by x(t) = 16t − 3. 0 t^3 , where the time t is in seconds. The particle is momentarily at rest at t = A. 0 .75 s B. 1 .3 s C. 5 .3 s D. 7 .3 s E. 9 .3 s ans: B
- A drag racing car starts from rest at t = 0 and moves along a straight line with velocity given by v = bt^2 , where b is a constant. The expression for the distance traveled by this car from its position at t = 0 is: A. bt^3 B. bt^3 / 3 C. 4 bt^2 D. 3 bt^2 E. bt^3 /^2 ans: B
- A ball rolls up a slope. At the end of three seconds its velocity is 20 cm/s; at the end of eight seconds its velocity is 0. What is the average acceleration from the third to the eighth second? A. 2 .5 cm/s^2 B. 4 .0 cm/s^2 C. 5 .0 cm/s^2 D. 6 .0 cm/s^2 E. 6 .67 cm/s^2 ans: B
- 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. 7 t^3 particle 2: x(t) = 3.5 + 2. 7 t^3 particle 3: x(t) = 3.5 + 2. 7 t^2 particle 4: x(t) = 3. 5 − 3. 4 t − 2. 7 t^2 Which of these particles is speeding up for t > 0? A. All four B. Only 1 C. Only 2 and 3 D. Only 2, 3, and 4 E. None of them ans: A
- An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4 m/s^2. Its average velocity as it goes from x = 2 m to x = 8 m is: A. 1 m/s B. 2 m/s C. 3 m/s D. 5 m/s E. 6 m/s ans: E
- Of the following situations, which one is impossible?
A. A body having velocity east and acceleration east B. A body having velocity east and acceleration west C. A body having zero velocity and non-zero acceleration D. A body having constant acceleration and variable velocity E. A body having constant velocity and variable acceleration ans: E
- Throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be: A. positive and negative, respectively B. negative and positive, respectively C. negative and negative, respectively D. negative and zero, respectively E. positive and zero, respectively ans: C
- A particle moves on the x axis. When its acceleration is positive and increasing:
A. its velocity must be positive B. its velocity must be negative C. it must be slowing down D. it must be speeding up E. none of the above must be true ans: E
- The position y of a particle moving along the y axis depends on the time t according to the equation y = at − bt^2. The dimensions of the quantities a and b are respectively: A. L^2 /T, L^3 /T^2 B. L/T^2 , L^2 /T C. L/T, L/T^2 D. L^3 /T, T^2 /L E. none of these ans: C
- A particle moves along the x axis according to the equation x = 6t^2 , where x is in meters and t is in seconds. Therefore: A. the acceleration of the particle is 6 m/s^2 B. t cannot be negative C. the particle follows a parabolic path D. each second the velocity of the particle changes by 9.8 m/s E. none of the above ans: E
- Over a short interval near time t = 0 the coordinate of an automobile in meters is given by x(t) = 27t − 4. 0 t^3 , where t is in seconds. At the end of 1.0 s the acceleration of the auto is: A. 27 m/s^2 B. 4 .0 m/s^2 C. − 4 .0 m/s^2 D. −12 m/s^2 E. −24 m/s^2 ans: E
- Over a short interval, starting at time t = 0, the coordinate of an automobile in meters is given by x(t) = 27t − 4. 0 t^3 , where t is in seconds. The magnitudes of the initial (at t = 0) velocity and acceleration of the auto respectively are: A. 0; 12 m/s^2 B. 0; 24 m/s^2 C. 27 m/s; 0 D. 27 m/s; 12 m/s^2 E. 27 m/s; 24 m/s^2 ans: C
- At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by − 0. 50 t, in m/s^2 for t in seconds. It stops at t = A. 64 s B. 32 s C. 16 s D. 8 .0 s E. 4 .0 s ans: D
- A racing car traveling with constant acceleration increases its speed from 10 m/s to 50 m/s over a distance of 60 m. How long does this take? A. 2 .0 s B. 4 .0 s C. 5 .0 s D. 8 .0 s E. The time cannot be calculated since the speed is not constant ans: B
- A car starts from rest and goes down a slope with a constant acceleration of 5 m/s^2. After 5 s the car reaches the bottom of the hill. Its speed at the bottom of the hill, in meters per second, is: A. 1 B. 12. 5 C. 25 D. 50 E. 160 ans: C
- A car moving with an initial velocity of 25 m/s north has a constant acceleration of 3 m/s^2 south. After 6 seconds its velocity will be: A. 7 m/s north B. 7 m/s south C. 43 m/s north D. 20 m/s north E. 20 m/s south ans: A
- An object with an initial velocity of 12 m/s west experiences a constant acceleration of 4 m/s^2 west for 3 seconds. During this time the object travels a distance of: A. 12 m B. 24 m C. 36 m D. 54 m E. 144 m ans: D
- How far does a car travel in 6 s if its initial velocity is 2 m/s and its acceleration is 2 m/s^2 in the forward direction? A. 12 m B. 14 m C. 24 m D. 36 m E. 48 m ans: E
- At a stop light, a truck traveling at 15 m/s passes a car as it starts from rest. The truck travels at constant velocity and the car accelerates at 3 m/s^2. How much time does the car take to catch up to the truck? A. 5 s B. 10 s C. 15 s D. 20 s E. 25 s ans: B
- A ball is in free fall. Its acceleration is:
A. downward during both ascent and descent B. downward during ascent and upward during descent C. upward during ascent and downward during descent D. upward during both ascent and descent E. downward at all times except at the very top, when it is zero ans: A
- A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is: A. positive during both ascent and descent B. negative during both ascent and descent C. negative during ascent and positive during descent D. positive during ascent and negative during descent E. none of the above ans: D
- A baseball is thrown vertically into the air. The acceleration of the ball at its highest point is:
A. zero B. g, down C. g, up D. 2 g, down E. 2 g, up ans: B
- Which one of the following statements is correct for an object released from rest?
A. The average velocity during the first second of time is 4.9 m/s B. During each second the object falls 9.8 m C. The acceleration changes by 9.8 m/s^2 every second D. The object falls 9.8 m during the first second of time E. The acceleration of the object is proportional to its weight ans: A
- An object is thrown vertically upward at 35 m/s. Taking g = 10 m/s^2 , the velocity of the object 5 s later is: A. 7 .0 m/s up B. 15 m/s down C. 15 m/s up D. 85 m/s down E. 85 m/s up ans: B
- A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth. Which of the following statements is correct? A. The maximum velocity of the feather is 9.8 m/s B. The acceleration of the feather decreases until terminal velocity is reached C. The acceleration of the feather remains constant during the fall D. The acceleration of the feather increases during the fall E. The acceleration of the feather is zero ans: C
- An object is released from rest. How far does it fall during the second second of its fall?
A. 4 .9 m B. 9 .8 m C. 15 m D. 20 m E. 25 m ans: C
- A heavy ball falls freely, starting from rest. Between the third and fourth second of time it travels a distance of: A. 4 .9 m B. 9 .8 m C. 29 .4 m D. 34 .3 m E. 39 .8 m ans: D
- As a rocket is accelerating vertically upward at 9.8 m/s^2 near Earth’s surface, it releases a projectile. Immediately after release the acceleration (in m/s^2 ) of the projectile is: A. 9 .8 down B. 0 C. 9 .8 up D. 19 .6 up E. none of the above ans: A
- A stone is released from a balloon that is descending at a constant speed of 10 m/s. Neglecting air resistance, after 20 s the speed of the stone is: A. 2160 m/s B. 1760 m/s C. 206 m/s D. 196 m/s E. 186 m/s ans: C
- An object dropped from the window of a tall building hits the ground in 12.0 s. If its acceleration is 9.80 m/s^2 , the height of the window above the ground is: A. 29 .4 m B. 58 .8 m C. 118 m D. 353 m E. 706 m ans: E
- Neglecting the effect of air resistance a stone dropped off a 175-m high building lands on the ground in: A. 3 s B. 4 s C. 6 s D. 18 s E. 36 s ans: C
- A stone is thrown vertically upward with an initial speed of 19.5 m/s. It will rise to a maximum height of: A. 4 .9 m B. 9 .8 m C. 19 .4 m D. 38 .8 m E. none of these ans: C
- A baseball is hit straight up and is caught by the catcher 2.0 s later. The maximum height of the ball during this interval is: A. 4 .9 m B. 7 .4 m C. 9 .8 m D. 12 .6 m E. 19 .6 m ans: A
- The area under a velocity-time graph represents:
A. acceleration B. change in acceleration C. speed D. change in velocity E. displacement ans: E
- Displacement can be obtained from:
A. the slope of an acceleration-time graph B. the slope of a velocity-time graph C. the area under an acceleration-time graph D. the area under a velocity-time graph E. the slope of an acceleration-time graph ans: D
- An object has a constant acceleration of 3 m/s^2. The coordinate versus time graph for this object has a slope: A. that increases with time B. that is constant C. that decreases with time D. of 3 m/s E. of 3 m/s^2 ans: A
- The coordinate-time graph of an object is a straight line with a positive slope. The object has:
A. constant displacement B. steadily increasing acceleration C. steadily decreasing acceleration D. constant velocity E. steadily increasing velocity ans: D
- Which of the following five coordinate versus time graphs represents the motion of an object moving with a constant nonzero speed?
t
x
A
....... (^) t
x
B
t
x
C
t
x
D
t
x
E
ans: B
- Which of the following five acceleration versus time graphs is correct for an object moving in a straight line at a constant velocity of 20 m/s?
t
a
A
t
a
B
t
a
C
t
a
D
............................................................................................................................... (^) t
a
E
ans: E
