Class XIPHYSICSPhysics

PHYSICS TEST (17.6.2014) Single Correct option1.

Six vectors throughhave the magnitudes and directions indicated in figure. Which of the following statements is true?

(a)

(b)

(c) (b)

2.

Two vectors and are such that . The angle between the vectors is(A) 0o(B) 60o(C) 90o(D) 180o

3.The resultant of two forces is 20N. When one of the force is 10N and angle between two forces is 30o, then what is the value of the second force?(A) 10N(B) 20N

(C) 20N(D) 10N

4.The forces equal in magnitude, act on a particle. When square of their resultant is equal to three times their product, find the angle between them.(A) 120o(B) 90o(C) 60o(D) 30o

5.If , then angle between is(A) 30o(B) 45o (C) 60o(D) 90o

6. A motor cyclist is riding North in still air at 20 km h-1. If the wind starts blowing westward with a velocity of 45.8 km h-1, find the apparent velocity with which the motor cyclist moves, time it takes to cover 100km and its direction of motion.(A) 39.97 kmh-1, 1hour(B) 59.97 kmh-1, 3hour(C) 49.97 kmh-1, 2hour(D) 29.97 kmh-1, 4hour

7. Calculate the area of a parallelogram whose adjacent sides are given by the vectors :

(A) 7 units of area(B) 3 units of area(C) units of area(D) 7 units of area

8.Find the unit vector perpendicular to each of the vectors .

(A) (B)

(C) (D)

9.Given that . If and are not null vectors, find the value of .

(A) (A)

(A) (A)

10.The angle between is(a) 45o(b) 90o(c) 45o(d) 180o

11.A truck travelling due North at 50km h-1 turns west and travels at the same speed. What is the change in velocity?(a) 50km h-1 North-west

(b) 50 kmh-1 North-west(c) 50km h-1 South-west

(d) 50km h-1 South-West

12. If and the magnitude of , and are 5, 4 and 3 units respectively. The angle between and is(a) cos-1(3/5)(b) cos-1(4/5)(c) /2(d) sin-1(3/5)

13.A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40m/s towards north. The average acceleration of the body is (a) 1 m/s2(b) 7 m/s2

(c) m/s2(d) 5 m/s2

14.If vectors P, Q and R have magnitudes 5, 12 and 13 units and , the angle between Q and R is

(a) cos-1(b) cos-1

(c) cos-1(d) cos-1

15. A vector when added to the vector yields a resultant vector that is in the positive Y-direction and has a magnitude equal to that of . The magnitude of is (a) 3(B) 1

(c) (D) 10

16.The resultant of two vectors and is , then the angle between the vectors is

(a) cos-1(b)cos-1

(c)cos-1(d) cos-1

17. The resultant of two forces acting at an angle of 150o is 10N and is perpendicular to one of the forces. The other force is

(a) 20N(B) 10/N

(c) 20N(d) 20/N

18.A particle has initial velocity and acceleration . The magnitude of velocity after 10 seconds will be :

(a) 9 units(b) 5units(c) 5 units(d) 9 units

19.A vector is along positive X-axis. If its vector product with another vector is zero then could be :

(a) (b)

(c) (d)

20.For two vectors and , identify the false relation :

(a)

(b)

(c)

(d)

Class XPHYSICS TEST

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