Physics online class test-4 of class-9

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Name of the student *

A body starts from rest and is uniformly accelerated for 30s.The distance travelled in the first 10s is x,next 10s is y and the last 10s is z.Then x:y:z is the same as

2 points

1:2:4

1:2:6

1:3:4

1:3:5

Clear selection

A train of 150m length is going towards north direction at a speed of 10.5 m/s.A parrot flies at a speed of 4.5m/s towards south direction parallel to the railway track. What is the time taken by the parrot to cross the train?

1 point

10s

Clear selection

An object starting from rest travels 2m in first 2s and 160 m in next 4s.what will be the velocity after 7 s from the start.

3 points

70ms‐1

60m/s

50 m/s

80 ms‐¹

Clear selection

An athelete completes one round of a circular track of radius r in 40s.What will be the displacement at the end of 2minute 20 s?

2 points

None of these

Clear selection

A rocket is fired upward from the earths surface such that it creates an acceleration of 19.6ms-².If after 5s, its engine is switched off,the maximum height of the rocket from earth's surface would be

1 point

980m

700m

735m

750m

790m

Clear selection

Roll no. *

A body moves along the circumference of a circular track of radius R. What is the displacement of the body when it covers 3/4 th of its circumference ?

3 points

3 R

3/4 R

3/2 R

1.414 R

None of these

Clear selection

Class & section *

A body is thrown vertically upwards and rises to a height of 10 m.the velocity with which the body was thrown upwards is (g=9.8 ms-²)

2 points

10m/s

20 m/s

14 m/s

None of these

Clear selection

A bus starts from rest with an acceleration of 1ms-².A man who is 48m behind the bus starts with a uniform velocity of 10ms‐1.The minimum time after which the man will catch the bus is

1 point

4.0s

10 s

12 s

Clear selection

The second's hand of a watch is 2 cm long.The speed of the tip of this hand is

2 points

0.21 cm/s

2.1 cm/s

21.0 cm/s

None of these

Other:

Clear selection

When two bodies move uniformly towards each other, the distance between them decreases by 8 m/s.If both the bodies move in the same direction with the same speeds,the distance between them increases by 6ms‐¹.calculate the speed of two bodies.

1 point

7ms-¹ & 2ms-¹

1ms-¹ & 6ms-¹

7ms‐1 & 1ms-¹

None of these

Clear selection

The brakes applied to a car produce negative acceleration of 6ms-².If the car takes 2s to stop after applying the brakes,calculated the distance it travels during this time.

2 points

10m

12m

16m

20m

Clear selection

A body moving with a uniform acceleration travels 84m in the first 6 s and 180 m in the next 5 s. Find the initial velocity and the acceleration of the body.

1 point

2m/s and 4m/s²

4ms-¹and 2ms-²

8ms-¹ & 4ms-²

None of these

Clear selection

A car travels equal distance in the same direction with velocities 60 kmh-¹,20kmh-¹ & 10 kmh-¹ respectively.The average velocity of the car over the whole journey is

1 point

5 ms-¹

6ms-¹

7ms-¹

8ms-¹

Clear selection

A body was thrown vertically upwards and rises to height of 10m.The time taken by the body to reach the highest point is (g=9.8m/s²)

2 points

1.41 s

4.1 s

1.24 s

1.5 s

Clear selection

The numerical ratio of displacement to distance

1 point

Is always=1

is always<1

is always >1

is always =<1

Clear selection

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