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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

The ratios of the distance covered by a freely falling particle, starting from rest in the first, second, third ... nth seconds of its motion

(A)

Form the series corresponding to the squares of the first n natural numbers

(B)

Form an A.P.

(C)

Form a series corresponding to the difference of the squares of the successive natural numbers

(D)

Both choices (b) and (c) are correct

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

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-5

A car is moving along a straight road with a uniform acceleration. It passes through two points P and Q separated by a distance with velocity 30 km/h and 40 km/h respectively. The velocity of the car midway between P and Q is

(A)

33.3 km/h

(B)

20 √2 km/h

(C)

25 √2 km/h

(D)

0.35 km/h

Question-6

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-7

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-8

A ball P is dropped vertically and another ball Q is thrown horizontally from the same height and at the same time. If air resistance is neglected, then,

(A)

Ball P reaches the ground first

(B)

Ball Q reaches the ground first

(C)

Both the balls reach the ground at the same time

(D)

Respective masses of the two balls will decide the time

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

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

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