The velocity of a body depends upon time according to the equation v = 20 + 0.lt^{2}. The body is undergoing

(A)

uniform acceleration

(B)

uniform retardation

(C)

non-uniform acceleration

(D)

zero acceleration

Question-2

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-3

A body is thrown vertically upwards from the ground. It reaches a maximum height of 20 m in 5s. After what time it will reach the ground from its maximum height position?

(A)

2.5 s

(B)

5 s

(C)

10 s

(D)

25 s

Question-4

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-5

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-6

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-7

An athlete completes one round of a circular track of radius r in 40 seconds. What will be his displacement at the end of 2 min and 20 seconds?

(A)

zero

(B)

2 R

(C)

2 π R

(D)

7 π R

Question-8

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-9

If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of

(A)

2880 m

(B)

1440 m

(C)

400 m

(D)

20 m

Question-10

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

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