Motion in a Straight Line Test

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Motion in a Straight Line Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Average speed is defined as the total path length travelled divided by the total time interval during which

A
minimum motion has taken place

B
the motion has taken place

C
maximum motion has taken place

D
uniform motion has taken place

Solution

Average speed is the ratio of distance traveled to time spent.

To find average speed, divide the total number of km traveled by the total elapsed time in hours. The answer is the average speed in km per hour.
Question 2
1 / -0

A car moving at a speed v is stopped after a certain distance when the brakes produce a deceleration a. If the speed of the car is nv, what must be the deceleration of the car to stop it in the same distance and in the same time?

A
√n a

B
na

C
n²a

D
n³a
Question 3
1 / -0

An automobile travelling with a speed of 60 km/hr can stop within a distance of 20 m. If a car travels twice as fast, i.e. 120 km/hr, then the automobile will stop within a distance of

A
20 m

B
40 m

C
60 m

D
80 m
Question 4
1 / -0

A metro train starts from rest and in 5 s, attains a speed of 108 km/hr. After that, it moves with a constant velocity and comes to rest after travelling 45 metres with uniform retardation. If the total distance travelled is 395 metres, find the total time of travelling.

A
12.2 s

B
15.3 s

C
9 s

D
17.2 s
Question 5
1 / -0

Displacement is a

A
scalar

B
Vector

C
Hector

D
tensor

Solution

Displacement vector is a vector which gives the position of a point with reference to a point other than the origin of the coordinate system.
Question 6
1 / -0

A bullet is fired into a fixed wooden block and it loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of

A
22/3 cm

B
40/3 cm

C
20/3 cm

D
22/5 cm
Question 7
1 / -0

For motion in 3 dimensions we need

A
No frame of reference is required a single point will do.

B
No frame of reference is required ; a set of 3 points will do.

C
frame of reference consisting of a clock and a Cartesian coordinate system having three mutually perpendicular axes, labeled X-, Y-, and Z- axes

D
frame of reference consisting of a clock and a Cartesian coordinate system having two mutually perpendicular axes, labeled X-, and Y- axes

Solution

Motion is a change in position of an object with time. In order to specify position, we need to use a reference point and a set of axes. It is convenient to choose a rectangular coordinate system consisting of three mutually perpenducular axes, labelled X-, Y-, and Z- axes.

The point of intersection of these three axes is called origin (O) and serves as the reference point. The coordinates (x, y. z) of an object describe the position of the object with respect to this coordinate system.

To measure time, we position a clock in this system. This coordinate system along with a clock constitutes a frame of reference.
Question 8
1 / -0

If a ball is thrown horizontally with a velocity of 8 m/s from the top of a building, the ball falls on the ground 12 m away from the building. What is the height of the building?

A
10 m

B
11 m

C
20 m

D
28 m
Question 9
1 / -0

A student is standing at a distance of 50 metres from a bus. As soon as the bus begins its motion with an acceleration of 1 ms^-2, the student starts running towards the bus with a uniform velocity 'u'. Assuming the motion to be along a straight road, calculate the minimum value of 'u' so that the student is able to catch the bus.

A
8 ms^-1

B
5 ms^-1

C
12 ms^-1

D
10 ms^-1

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Re-Attempt Weekly Quiz Competition

Motion in a Straight Line Test - 3

Result

Motion in a Straight Line Test - 3

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SHARING IS CARING

Question 1

minimum motion has taken place

the motion has taken place

maximum motion has taken place

uniform motion has taken place

Solution

Question 2

√n a

na

n2a

n3a

Question 3

20 m

40 m

60 m

80 m

Question 4

12.2 s

15.3 s

9 s

17.2 s

Question 5

scalar

Vector

Hector

tensor

Solution

Question 6

22/3 cm

40/3 cm

20/3 cm

22/5 cm

Question 7

No frame of reference is required a single point will do.

No frame of reference is required ; a set of 3 points will do.

frame of reference consisting of a clock and a Cartesian coordinate system having three mutually perpendicular axes, labeled X-, Y-, and Z- axes

frame of reference consisting of a clock and a Cartesian coordinate system having two mutually perpendicular axes, labeled X-, and Y- axes

Solution

Question 8

10 m

11 m

20 m

28 m

Question 9

8 ms-1

5 ms-1

12 ms-1

10 ms-1

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n²a

n³a

8 ms^-1

5 ms^-1

12 ms^-1

10 ms^-1