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

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

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-3

A bullet is fired from a gun with a speed of 100 m/s in order to hit a target 100m away. At what height above the target should the gun be aimed? (The resistance of air is negligible and g = 10 m/s^{2})

(A)

5 cm

(B)

10 cm

(C)

15 cm

(D)

20 cm

Question-4

The position vector of a particle, is . The velocity of the particle is

(A)

directed towards the origin

(B)

directed away from the origin

(C)

parallel to the position vector

(D)

perpendicular to the position vector

Question-5

When milk is churned, cream gets separated due to

(A)

centripetal force

(B)

centrifugal force

(C)

frictional force

(D)

gravitational force

Question-6

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-7

The resultant of × 0 will be equal to

(A)

zero

(B)

A

(C)

zero vector

(D)

unit vector

Question-8

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

Question-9

Which of the following is not a vector quantity?

(A)

Speed

(B)

Velocity

(C)

Torque

(D)

Displacement

Question-10

The vectors and are such that | + | = | - | then angle between the two vectors will be

(A)

45°

(B)

60°

(C)

75°

(D)

90°

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