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A body dropped from top of a tower fall through 40 m during the last two seconds of its fall. The height of tower is (g = 10m/s^{2})

(A)

60 m

(B)

45 m

(C)

80 m

(D)

50 m

Question-2

A car travels for half of its time at 80 km/h and for the rest half time at 40 km/h. Total distance covered is 60 km. What is the average speed of the car?

(A)

60 km/h

(B)

80 km/h

(C)

120 km/h

(D)

180 km/h

Question-3

A car covers the first – half of the distance between two places at 40 km/h and other half at 60km/h. The average speed of the car is

(A)

40 km/h

(B)

48 km/h

(C)

50 km/h

(D)

60 km/h

Question-4

A body falling from rest describes distances S_{1}, S_{2} and S_{3} in the first, second and third seconds of its fall. The ratio of S_{1} : S_{2} : S_{3} is

(A)

1 : 2 : 3

(B)

1 : 3 : 5

(C)

1 : 1 : 1

(D)

1 : 4 : 9

Question-5

If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine is ( Take g = 9.8 m/s^{2})

(A)

9.8 m/s

(B)

19.6 m/s

(C)

39.2 m/s

(D)

98 m/s

Question-6

What will be ratio of the distance moved by a freely falling body from rest in 4^{th} and 5^{th} seconds of journey?

(A)

4 : 5

(B)

7 : 9

(C)

16 : 25

(D)

1 : 1

Question-7

Three different objects of masses m_{1}, m_{2} and m_{3} are allowed to fall from rest and from the same point O along three different friction less paths. The speeds of the three objects on reaching the ground will be in the ratio of

(A)

m_{1}: m_{2} : m_{3}

(B)

m_{1} : 2m_{2 }: 3m_{3}

(C)

1 : 1 : 1

(D)

Question-8

The water drops fall at regular intervals from a tap 5 m above the ground. The third drop is leaving the tap at an instant when the first drop touches the ground. How far above the ground is the second drop at that instant?( Take g = 10m/s^{2})

(A)

1.25 m

(B)

2.50 m

(C)

3.75 m

(D)

5.00 m

Question-9

The displacement of a body is given to be proportional to the cube of time elapsed. The magnitude of the acceleration of the body is

(A)

Increasing with time

(B)

Decreasing with time

(C)

Constant but not zero

(D)

Zero

Question-10

One train A 120 m long is moving in a direction with a speed of 20 m/s. Another train B 130 m long is moving with a speed of 30 m/s in the opposite direction. The train B crosses the train A in a time

(A)

5 s

(B)

36 s

(C)

38 s

(D)

10 s

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