When a body moves with a constant speed along a circle

(A)

its velocity remains constant

(B)

no force acts on it

(C)

no work is done on it

(D)

no acceleration is produced it

Question-2

Which of the following is not a vector quantity?

(A)

Speed

(B)

Velocity

(C)

Torque

(D)

Displacement

Question-3

The angle between and is θ. The value of the triple product .( × ) is

(A)

A^{2}B

(B)

zero

(C)

A^{2}B sin θ

(D)

A^{2}B cos θ

Question-4

A body constrained to move in Y-direction is subjected to a force given by . What is the work done by this force in moving the body through a distance of 10 m along Y-axis?

(A)

190 J

(B)

160 J

(C)

150 J

(D)

20 J

Question-5

The magnitudes of vectors are 3,4 and 5 units respectively. If , the angle between is

(A)

(B)

cos^{-1} (0.6)

(C)

(D)

Question-6

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-7

A boat is sent across a river with a velocity of 8 km h^{-1}. If the resultant velocity of boat is 10 km h^{-1} , then velocity of river is

(A)

12.8 km h^{-1}

(B)

6 km h^{-1}

(C)

8 km h^{-1}

(D)

10 km h^{-1}

Question-8

Two bodies of same mass are projected with the same velocity at an angle 30° and 60° respectively. The ratio of their horizontal ranges will be

(A)

1 : 1

(B)

1 : 2

(C)

1 : 3

(D)

1 : √2

Question-9

A bus is moving on a straight road towards north with a uniform speed of 50 km/h. If the speed remains unchanged after turning through 90°, the increase in the velocity of bus in the turning process is

(A)

7.07 km/h along south-west direction

(B)

zero

(C)

50 km/h along west

(D)

70.7 km/h along north-west direction

Question-10

A person swims in a river aiming to reach exactly opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle 120° with the direction of flow of water. The speed of water in stream is

(A)

1.0 m/s

(B)

0.5 m/s

(C)

0.25 m/s

(D)

0.43 m/s

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