Motion Test

Result

Motion Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

A car has an uniform acceleration of 8 ms⁻². What distance will it cover in 20 second after start?

A
1600 m

B
200 m

C
800 m

D
400 m

Solution

Distance covered (S) = ut + ½ at².

Here, a = 8 m/s², t = 20 s.

Therefore, S=0 × 20 + 1/2 × 8 × 20 × 20 = 1600 m
Question 2
1 / -0

A man walks at 1 m/s for 60 minutes.He takes rest for 20 minutes and then walks at a speed of 1 m/s for 60 minutes.Find his average speed.

A
0.95 m/s

B
0.85 m/s.

C
0.96 m/s

D
0.86 m/s

Solution

Average speed = Total distance travelled/Total time taken

distance= 1 m/s × 36001 sec = 3600 m,

Average speed = (3600 +3600)m/(3600 + 3600 +1200)sec = 7200 m/8400 sec = 0.86 m/s.

It can be also represented in km/h.

In km/h,the average speed of the man is 0.0516 km/h
Question 3
1 / -0

The reference point for measuring position of a body is called

A
Origin

B
Initial position

C
Final position

D
None of these

Solution

The reference point for measuring position of a body is called origin. Every distance is measured in respect to origin.
Question 4
1 / -0

Under what conditions is the magnitude of average velocity of an object equal to its average speed?

A
a body is moving in uniform motion

B
a body moves in a straight line with reversing its direction

C
a body is moving at constant acceleration

D
a body moves in a straight line without reversing its direction

Solution

When an object moves along a straight line in the same direction, its total path length is the magnitude of displacement. Hence its average speed is equal to the magnitude of average velocity.
Question 5
1 / -0

If a bus accelerates uniformly from rest to attain a speed of 144 km h^–1 in 20 seconds it covers a distance of

A
800 m

B
200 m

C
600 m

D
400 m

Solution

Here, initial velocity (u) = 0 m/s, final velocity (v) = 144 km/h =144 x 5/18= 40 m/s, t = 20s, a = 40-0/20 = 2 m/s² .

S = ut + ½ at²= 0 × 20 + 1/2 × 2 × 20 × 20 = 400 m
Question 6
1 / -0

Odometer is a device installed in vehicles which measures-

A
the speed of the vehicles

B
all of these

C
the acceleration of the vehicles

D
the distance travelled by vehicles

Solution

The speed of a running vehicle at any instant of time is shown by an instrument called 'speedometer'. The distance travelled by a vehicle is measured by another instrument called 'odometer' which is installed in the vehicle.It records the distance in kilometres.
Question 7
1 / -0

What is the ratio of CGS unit to SI unit of velocity?

A
10

B
1/10

C
1/100

D
100

Solution

CGS unit of velocity is cm/s and SI unit of velocity is m/s.

Ratio of CGS unit to SI unit= cm/m

(1 meter is equal to 100 cm. )

Therefore, ratio = 1/100 = 1: 100
Question 8
1 / -0

What is the ratio of distance to displacement?

A
Equal to 1

B
Greater than or equal to 1

C
More than 1

D
Less than 1

Solution

Distance is the actual length covered by a body and displacement is the shortest distance between initial and final position. So, distance will be equal or more than displacement.

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Re-Attempt Weekly Quiz Competition

Motion Test - 12

Result

Motion Test - 12

Score

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Rank

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SHARING IS CARING

Question 1

1600 m

200 m

800 m

400 m

Solution

Question 2

0.95 m/s

0.85 m/s.

0.96 m/s

0.86 m/s

Solution

Question 3

Origin

Initial position

Final position

None of these

Solution

Question 4

a body is moving in uniform motion

a body moves in a straight line with reversing its direction

a body is moving at constant acceleration

a body moves in a straight line without reversing its direction

Solution

Question 5

800 m

200 m

600 m

400 m

Solution

Question 6

the speed of the vehicles

all of these

the acceleration of the vehicles

the distance travelled by vehicles

Solution

Question 7

10

1/10

1/100

100

Solution

Question 8

Equal to 1

Greater than or equal to 1

More than 1

Less than 1

Solution

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