Tamil Nadu (English Medium) Plus 1 Biology Science Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

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-2

The maximum range of a gun of horizontal terrain is 16 km. If g = 10 ms^{-2} , then muzzle velocity of a shell must be

(A)

160 ms^{-1}

(B)

200√2 ms^{-1}

(C)

400 ms^{-1}

(D)

800 ms^{-1}

Question-3

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-4

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-5

A car moves a distance of 200 m. It covers the first-half of the distance at speed v. The average speed is 48 km/h. Find the value of v.

(A)

56 km/h

(B)

60 km/h

(C)

50 km/h

(D)

48 km/h

Question-6

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-7

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-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

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 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

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