The average speed of a moving object during a given interval of time is always:
The magnitude of its average velocity over the interval
The distance covered during the time interval divided by the time interval
One-half its speed at the end of the interval
One-half its acceleration multiplied by the time interval
Of the following situations, which one is impossible
A body having velocity east and acceleration east
A body having velocity east and acceleration west
A body having zero velocity and non-zero acceleration
A body having constant acceleration and variable velocity
A body having constant velocity and variable acceleration
Throughout a time interval, while the speed of a particle increases as it moves along the x axis,its velocity and acceleration might be
Positive and negative, respectively
Negative and positive, respectively
Negative and negative, respectively
Negative and zero, respectively
Positive and zero, respectively
A particle moves on the x axis.When its acceleration is positive and increasing:
Its velocity must be positive
Its velocity must be negative
It must be slowing down
It must be speeding up
None of the above must be true
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
The acceleration of the particle is 6 m/s2
t cannot be negative
The particle follows a parabolic path
Each second the velocity of the particle changes by 9.8 m/s
None of the above
A ball is in free fall.Its acceleration is:
Downward during both ascent and descent
Downward during ascent and upward during descent
Upward during ascent and downward during descent
Upward during both ascent and descent
Downward at all times except at the very top, when it is zero
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
Positive during both ascent and descent
Negative during both ascent and descent
Negative during ascent and positive during descent
Positive during ascent and negative during descent
A baseball is thrown vertically into the air.The acceleration of the ball at its highest point is
Zero
g,down
g,up
2g,down
2g,up
Which one of the following statements is correct for an object released from rest
The average velocity during the first second of time is 4.9m/s
During each second the object falls 9.8m
The acceleration changes by 9.8m/s2 every second
The object falls 9.8m during the first second of time
The acceleration of the object is proportional to its weight
A freely falling body has a constant acceleration of 9.8 m/s2.This means that
The body falls 9.8 m during each second
The body falls 9.8 m during the first second only
The speed of the body increases by 9.8 m/s during each second
The acceleration of the body increases by 9.8 m/s2 during each second
The acceleration of the body decreases by 9.8 m/s2 during each second
An object is shot vertically upward. While it is rising
Its velocity and acceleration are both upward
Its velocity is upward and its acceleration is downward
Its velocity and acceleration are both downward
Its velocity is downward and its acceleration is upward
Its velocity and acceleration are both decreasing
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
The maximum velocity of the feather is 9.8 m/s
The acceleration of the feather decreases until terminal velocity is reached
The acceleration of the feather remains constant during the fall
The acceleration of the feather increases during the fall
The acceleration of the feather is zero
The area under a velocity-time graph represents
Acceleration
Change in acceleration
Speed
Change in velocity
Displacement
Displacement can be obtained from
The slope of an acceleration-time graph
The slope of a velocity-time graph
The area under an acceleration-time graph
The area under a velocity-time graph
An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this object has a slope
That increases with time
That is constant
That decreases with time
Of 3 m/s
Of 3 m/s^2
Velocity is defined as
Rate of change of position with time
Position divided by time
Rate of change of acceleration with time
A speeding up or slowing down
Change of position
Acceleration is defined as:
Speed divided by time
Rate of change of velocity with time
Change of velocity
Which of the following is a scalar quantity?
Velocity
None of these
Which of the following is a vector quantity?
Mass
Density
Temperature
Which of the following is NOT an example of accelerated motion?
Vertical component of projectile motion
Circular motion at constant speed
A swinging pendulum
Earth’s motion about sun
Horizontal component of projectile motion
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:
Strikes the plane at the same time as the other body
Strikes the plane earlier than the other body
Has the vertical component of its velocity altered
Has the vertical component of its acceleration altered
Follows a straight line path along the resultant acceleration vector
The velocity of a projectile equals its initial velocity added to:
A constant horizontal velocity
A constant vertical velocity
A constantly increasing horizontal velocity
A constantly increasing downward velocity
A constant velocity directed at the target
A stone thrown from the top of a tall building follows a path that is:
Circular
Made of two straight line segments
Hyperbolic
Parabolic
A straight line
Identical 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.
I
II
III
A 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:
The bomber is over the target when the bomb strikes
The acceleration of the bomb is constant
The horizontal velocity of the plane equals the vertical velocity of the bomb when it hits the target
The bomb travels in a curved path
The time of flight of the bomb is independent of the horizontal speed of the plane
An 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:
In front of the flatcar
Behind the flatcar
On the flatcar
Either behind or in front of the flatcar, depending on the initial speed of the object
To the side of the flatcar
An isothermal process for an ideal gas is represented on a p-V diagram by:
A horizontal line
A vertical line
A portion of an ellipse
A portion of a parabola
A portion of a hyperbola
Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?
Radio waves
Visible light
X rays
Gamma rays
All of these travel at the same speed
An electromagnetic wave is generated by:
Any moving charge
Any accelerating charge
Only a charge with changing acceleration
Only a charge moving in a circle
Only a charge moving in a straight line
In a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is:
The speed of light
An increasing function of frequency
A decreasing function of frequency
√2
1/√2
The relation θ(incident) = θ(reflected),whichapplies as a ray of light strikes an interface between two media, is known as:
Faraday’s law
Snell’s law
Ampere’s law
Cole’s law
As used in the laws of reflection and refraction, the “normal” direction is:
Any convenient direction
Tangent to the interface
Along the incident ray
Perpendicular to the electric field vector of the light
Perpendicular to the interface
When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:
The material of the reflecting surface
The angle of incidence
The index of the medium
The intensity of the wave
The wavelength
The index of refraction of a substance is:
The speed of light in the substance
The angle of refraction
The speed of light in vacuum divided by the speed of light in the substance
Measured in radians
The units of index of refraction are:
m/s
s/m
radian
m/s^2
A virtual image is one:
Toward which light rays converge but do not pass through
From which light rays diverge but do not pass through
From which light rays diverge as they pass through
Toward which light rays converge and pass through
With a ray normal to a mirror passing through it
When you stand in front of a plane mirror, your image is:
Real, erect, and smaller than you
Real, erect, and the same size as you
Virtual, erect, and smaller than you
Virtual, erect, and the same size as you
Real, inverted, and the same size as you
As an object is moved from the center of curvature of a concave mirror toward its focal point its image:
Remains virtual and becomes larger
Remains virtual and becomes smaller
Remains real and becomes larger
Remains real and becomes smaller
Remains real and approaches the same size as the object
The image of an erect candle, formed using a convex mirror, is always:
Virtual, inverted, and smaller than the candle
Virtual, inverted, and larger than the candle
Virtual, erect, and larger than the candle
Virtual, erect, and smaller than the candle
Real, erect, and smaller than the candle
At what distance in front of a concave mirror must an object be placed so that the image and object are the same size:
A focal length
Half a focal length
Twice a focal length
Less than half focal length
More than twice a focal length
