Kinematics Test

Result

Kinematics Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored?

A

B

C

D

Solution

For a body going in upward direction v = ugt

The slope of the graph, dv/dt = − g (constant).

But when we take into account the effect of resistance it will have sharper slope.

Curve (d) fits into this result.
Question 2
1 / -0

Which of the following velocity-time graphs shows a realistic situation for a body in motion

A

B

C

D

Solution

Other graph shows more than one velocity of the particle at single instant of time which is not practically possible.
Question 3
1 / -0

A particle goes from point A to B. Its displacement is X and pathlength is y. So x/y...

A
> 1

B
< 1

C
≥ 1

D
≤ 1

Solution

Pathlenth is always greater or equal to displacement
Question 4
1 / -0

A car moving with speed of 40km/hr can be stopped by applying brakes after at least 2m. If the same car is moving with a speed of 80km/hr what is the minimum stopping distance?

A
2m

B
4m

C
6m

D
8m

Solution
Question 5
1 / -0

A body starts from rest, what is the ratio of the distance travelled by the body during the 4th and 3rd second?

A
7/5

B
5/7

C
7/3

D
3/7

Solution

Distance traveled by a free a free falling body in nth second = distance traveled in n secs−distance traveled in n−1 secs.
Question 6
1 / -0

If a body starts from rest and travels 120 cm in the 6^th second then what is the acceleration ?

A
0.20m/s²

B
0.027m/s²

C
0.218m/s²

D
0.003m/s²

Solution
Question 7
1 / -0

If a car at rest accelerates uniformly to a speed of 144 kmh⁻¹ in 20 s, then it covers a distance of:

A
20 m

B
400 m

C
1440 m

D
2880 m

Solution
Question 8
1 / -0

If a train travelling at 72 km/h is to be brought to rest at a distance of 200 m then its retardation should be :

A
20 m/s²

B
2 s²

C
10 m/s²

D
1 m/s²

Solution
Question 9
1 / -0

Two cars A and B are at rest at the same point initially. If A starts with uniform velocity of 40 m/sec and B starts in the same direction with a constant acceleration of 4 m/s², then B will catch A after how much time?

A
10 sec

B
20 sec

C
30 sec

D
35 sec

Solution
Question 10
1 / -0

A particle starts from rest, accelerates at 2 ms⁻² for 10 s and then goes for constant speed for 30 s and then deceleration at 4 ms⁻² till stops after next. What is the distance travelled by it?

A
750 m

B
800 m

C
700 m

D
850 m

Solution