Quiz
Physics Theory #2
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Questions in this quiz (40)
1The average speed of a moving object during a given interval of time is always:
- AThe magnitude of its average velocity over the interval
- BThe distance covered during the time interval divided by the time interval
- COne-half its speed at the end of the interval
- DOne-half its acceleration multiplied by the time interval
2Of the following situations, which one is impossible
- AA body having velocity east and acceleration east
- BA body having velocity east and acceleration west
- CA body having zero velocity and non-zero acceleration
- DA body having constant acceleration and variable velocity
- EA body having constant velocity and variable acceleration
3Throughout a time interval, while the speed of a particle increases as it moves along the x axis,its velocity and acceleration might be
- APositive and negative, respectively
- BNegative and positive, respectively
- CNegative and negative, respectively
- DNegative and zero, respectively
- EPositive and zero, respectively
4A particle moves on the x axis.When its acceleration is positive and increasing:
- AIts velocity must be positive
- BIts velocity must be negative
- CIt must be slowing down
- DIt must be speeding up
- ENone of the above must be true
5A particle moves along the x axis according to the equation x = 6t^2, where x is in meters and t is in seconds.Therefore
- AThe acceleration of the particle is 6 m/s2
- Bt cannot be negative
- CThe particle follows a parabolic path
- DEach second the velocity of the particle changes by 9.8 m/s
- ENone of the above
6A ball is in free fall.Its acceleration is:
- ADownward during both ascent and descent
- BDownward during ascent and upward during descent
- CUpward during ascent and downward during descent
- DUpward during both ascent and descent
- EDownward at all times except at the very top, when it is zero
7A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is
- APositive during both ascent and descent
- BNegative during both ascent and descent
- CNegative during ascent and positive during descent
- DPositive during ascent and negative during descent
- ENone of the above
8A baseball is thrown vertically into the air.The acceleration of the ball at its highest point is
- AZero
- Bg,down
- Cg,up
- D2g,down
- E2g,up
9Which one of the following statements is correct for an object released from rest
- AThe average velocity during the first second of time is 4.9m/s
- BDuring each second the object falls 9.8m
- CThe acceleration changes by 9.8m/s2 every second
- DThe object falls 9.8m during the first second of time
- EThe acceleration of the object is proportional to its weight
10A freely falling body has a constant acceleration of 9.8 m/s2.This means that
- AThe body falls 9.8 m during each second
- BThe body falls 9.8 m during the first second only
- CThe speed of the body increases by 9.8 m/s during each second
- DThe acceleration of the body increases by 9.8 m/s2 during each second
- EThe acceleration of the body decreases by 9.8 m/s2 during each second
11An object is shot vertically upward. While it is rising
- AIts velocity and acceleration are both upward
- BIts velocity is upward and its acceleration is downward
- CIts velocity and acceleration are both downward
- DIts velocity is downward and its acceleration is upward
- EIts velocity and acceleration are both decreasing
12A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth.Which of the following statements is correct
- AThe maximum velocity of the feather is 9.8 m/s
- BThe acceleration of the feather decreases until terminal velocity is reached
- CThe acceleration of the feather remains constant during the fall
- DThe acceleration of the feather increases during the fall
- EThe acceleration of the feather is zero
13The area under a velocity-time graph represents
- AAcceleration
- BChange in acceleration
- CSpeed
- DChange in velocity
- EDisplacement
14Displacement can be obtained from
- AThe slope of an acceleration-time graph
- BThe slope of a velocity-time graph
- CThe area under an acceleration-time graph
- DThe area under a velocity-time graph
15An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this object has a slope
- AThat increases with time
- BThat is constant
- CThat decreases with time
- DOf 3 m/s
- EOf 3 m/s^2
16Velocity is defined as
- ARate of change of position with time
- BPosition divided by time
- CRate of change of acceleration with time
- DA speeding up or slowing down
- EChange of position
17Acceleration is defined as:
- ARate of change of position with time
- BSpeed divided by time
- CRate of change of velocity with time
- DA speeding up or slowing down
- EChange of velocity
18Which of the following is a scalar quantity?
- ASpeed
- BVelocity
- CDisplacement
- DAcceleration
- ENone of these
19Which of the following is a vector quantity?
- AMass
- BDensity
- CSpeed
- DTemperature
- ENone of these
20Which of the following is NOT an example of accelerated motion?
- AVertical component of projectile motion
- BCircular motion at constant speed
- CA swinging pendulum
- DEarth’s motion about sun
- EHorizontal component of projectile motion
21Two 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:
- AStrikes the plane at the same time as the other body
- BStrikes the plane earlier than the other body
- CHas the vertical component of its velocity altered
- DHas the vertical component of its acceleration altered
- EFollows a straight line path along the resultant acceleration vector
22The velocity of a projectile equals its initial velocity added to:
- AA constant horizontal velocity
- BA constant vertical velocity
- CA constantly increasing horizontal velocity
- DA constantly increasing downward velocity
- EA constant velocity directed at the target
23A stone thrown from the top of a tall building follows a path that is:
- ACircular
- BMade of two straight line segments
- CHyperbolic
- DParabolic
- EA straight line
24Identical guns fire 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 flight time is less for the bullet on the Earth
III. The velocity of the bullets at impact are the same.- AI
- BII
- CIII
25A bomber flying in level flight with constant velocity releases a bomb before it is over the target. Neglecting air resistance, which one of the following is NOT true:
- AThe bomber is over the target when the bomb strikes
- BThe acceleration of the bomb is constant
- CThe horizontal velocity of the plane equals the vertical velocity of the bomb when it hits the target
- DThe bomb travels in a curved path
- EThe time of flight of the bomb is independent of the horizontal speed of the plane
26An object is shot from the back of a railroad flatcar moving at 40km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the flatcar. The object falls:
- AIn front of the flatcar
- BBehind the flatcar
- COn the flatcar
- DEither behind or in front of the flatcar, depending on the initial speed of the object
- ETo the side of the flatcar
27An isothermal process for an ideal gas is represented on a p-V diagram by:
- AA horizontal line
- BA vertical line
- CA portion of an ellipse
- DA portion of a parabola
- EA portion of a hyperbola
28Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?
- ARadio waves
- BVisible light
- CX rays
- DGamma rays
- EAll of these travel at the same speed
29An electromagnetic wave is generated by:
- AAny moving charge
- BAny accelerating charge
- COnly a charge with changing acceleration
- DOnly a charge moving in a circle
- EOnly a charge moving in a straight line
30In a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is:
- AThe speed of light
- BAn increasing function of frequency
- CA decreasing function of frequency
- D√2
- E1/√2
31The relation θ(incident) = θ(reflected),whichapplies as a ray of light strikes an interface between two media, is known as:
- AFaraday’s law
- BSnell’s law
- CAmpere’s law
- DCole’s law
- ENone of these
32As used in the laws of reflection and refraction, the “normal” direction is:
- AAny convenient direction
- BTangent to the interface
- CAlong the incident ray
- DPerpendicular to the electric field vector of the light
- EPerpendicular to the interface
33When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:
- AThe material of the reflecting surface
- BThe angle of incidence
- CThe index of the medium
- DThe intensity of the wave
- EThe wavelength
34The index of refraction of a substance is:
- AThe speed of light in the substance
- BThe angle of refraction
- CThe angle of incidence
- DThe speed of light in vacuum divided by the speed of light in the substance
- EMeasured in radians
35The units of index of refraction are:
- Am/s
- Bs/m
- Cradian
- Dm/s^2
- ENone of these
36A virtual image is one:
- AToward which light rays converge but do not pass through
- BFrom which light rays diverge but do not pass through
- CFrom which light rays diverge as they pass through
- DToward which light rays converge and pass through
- EWith a ray normal to a mirror passing through it
37When you stand in front of a plane mirror, your image is:
- AReal, erect, and smaller than you
- BReal, erect, and the same size as you
- CVirtual, erect, and smaller than you
- DVirtual, erect, and the same size as you
- EReal, inverted, and the same size as you
38As an object is moved from the center of curvature of a concave mirror toward its focal point its image:
- ARemains virtual and becomes larger
- BRemains virtual and becomes smaller
- CRemains real and becomes larger
- DRemains real and becomes smaller
- ERemains real and approaches the same size as the object
39The image of an erect candle, formed using a convex mirror, is always:
- AVirtual, inverted, and smaller than the candle
- BVirtual, inverted, and larger than the candle
- CVirtual, erect, and larger than the candle
- DVirtual, erect, and smaller than the candle
- EReal, erect, and smaller than the candle
40At what distance in front of a concave mirror must an object be placed so that the image and object are the same size:
- AA focal length
- BHalf a focal length
- CTwice a focal length
- DLess than half focal length
- EMore than twice a focal length
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- Hanzo Conard
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