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Class 9 Science
Describing Motion Around Us Chapter 4 Quiz 5
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Acceleration is a vector quantity, which indicates that its value
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(a) Is always negative
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(b) Is always positive
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(c) Is zero
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(d) Can be positive, negative or zero
The average velocity of a body is given by the expression :
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(a) V= u+ at
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(b) 2as= v2− u2
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(c) Vav=(u + v)/2
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(d) S= ut + ½ a t2
Distance covered by a body from velocity-time graph is
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(a) Is denoted by a line parallel to the distance axis at any point on the time axis
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(b) Is denoted by a line parallel to the time axis at any point on the distance axis
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(c) Equal to the slope of the graph
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(d) Area under the graph
An example of a body moving with constant speed but still accelerating is
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(a) A body moving with constant speed on a straight road
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(b) A body moving in a helical path with constant speed
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(c) A body moving with constant speed in a circular path
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(d) A body moving with constant speed on a straight railway track
The S.I. unit of force is
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Kgm/s
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Kgm/s2
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Newton
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Newton-meter
What do we get by the product of mass and velocity?
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Force
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Inertia
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Momentum
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Newton
What does the slope of distance - time graph give?
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(a) Acceleration
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(b) Uniform speed
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(c) Speed
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(d) both[b] and [c] depending upon the time of graph
The velocity of an object is directly proportional to the time elapsed. The object has
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uniform speed
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uniform velocity
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uniform acceleration
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variable acceleration
The distance travelled by the body cannot be zero. This statement is_____? ( True / False )
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True
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False
Can motion be considered as a change of position of a body with respect to a reference point? ( True / False )
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True
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False
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Can't say
From the above-given velocity-time graph, it can be inferred that the object is in/at?
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Rest
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In uniform motion
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It is moving with uniform acceleration
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It's in Non-Uniform Motion
A boy went to a fair, He enjoyed a ride on a merry-go-round which was moving at a constant speed of 12 m/s. It implies that the boy was in/at?
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Non-Uniform motion
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Accelerated motion
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At rest
What is the state of a body when its position does not change with respect to a reference point?
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Velocity
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Rest
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Acceleration
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Motion
Which type of motion occurs when a body travels equal distances in equal intervals of time?
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Uniform motion
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Decelerated motion
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Non-uniform motion
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Accelerated motion
What is the term for the actual path length traveled by an object?
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Displacement
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Distance
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Velocity
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Speed
What is the SI unit of speed?
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m/s
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km/hr
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m/s²
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km
If a body travels 4 km North and then turns right to travel 4 km, what is the total distance traveled?
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6 km
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10 km
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4 km
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8 km
What is the average speed if a body travels 20 km in 1 hour and 30 km in 2 hours?
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20 km/hr
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25 km/hr
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30 km/hr
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15 km/hr
What is the formula for calculating acceleration?
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a = v/t
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a = s/t
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a = u + at
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a = (v-u)/t
Which of the following describes uniform circular motion?
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Changing speed and changing velocity
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Zero speed
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Constant speed and constant velocity
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Constant speed with changing velocity
What happens to the velocity of a body in uniform motion?
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It increases
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It decreases
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It remains constant
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It becomes zero
What is the average velocity if the displacement is 100 m and the time taken is 5 s?
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30 m/s
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20 m/s
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25 m/s
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15 m/s
Which of the following is true about vector quantities?
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They are always positive.
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They can be negative.
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They have both magnitude and direction.
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They have only magnitude.
What is the term for the rate of change of velocity?
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Speed
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Displacement
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Distance
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Acceleration
If a car travels 60 km in 1 hour and then 90 km in 2 hours, what is the average speed?
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80 km/hr
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70 km/hr
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60 km/hr
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50 km/hr
What is the formula for the first equation of motion?
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s = ut + ½ at²
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s = vt
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v = u + at
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v² = u² + 2as
What is the total distance traveled by a body moving with uniform acceleration?
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s = vt
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s = ut + ½ at²
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s = v - u
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s = u + at
What is the term for the change in velocity over time?
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Speed
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Acceleration
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Displacement
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Distance
What is the graphical representation of distance vs. time for a body at rest?
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A vertical line
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A straight line
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A curve
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A horizontal line
What is the acceleration of a body if its velocity changes from 10 m/s to 20 m/s in 5 seconds?
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4 m/s²
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3 m/s²
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1 m/s²
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2 m/s²
0 h : 0 m : 1 s
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