11th class (Fsc) Physics unit 2 MCQs
chapter 2 MCQs 11th Class Physics
Vectors and Equilibrium:
1. Position vector of a point P( a,b,c) in YZ- plane is given by:
a. →r= bj^+ck^
b. →r= ai^+bj^
c. →r= ai^+bj^+ck^
d. →r= ai^+ck^
2. A paratrooper moves downward with:
a. Positive acceleration
b. Zero acceleration
c. Negative acceleration
d. Constant acceleration
3. Name the quantity which is a vector:
a. Temperature
b. Speed
c. Density
d. Force
4. The direction of vector in space is specified by:
a. 3-angle
b. 1-angle
c. 4-angle
d. 2-angle
5. If →A = i^+j^+K^ then magnitude of →A is?
a. √3
b. 1
c. √2
d. 2
6. The resultant of two vectors having magnitude 12N and 8N cannot be:
a. 10N
b. 2N
c. 16N
d. 20N
7. A vector in space has components:
a. 3
b. 1
c. 4
d. 2
8. If →B= 4i^ + 5k^ then its magnitude will be:
a. 7
b. 9
c. 3
d. √41
9. If →A= 2i^+ j^2 k^ then IAI is
a. 5
b. Zero
c. 9
d. 3
10. The resultant of two forces 3N and 4N acting at right angle to each other is:
a. 1 N
b. 5 N
c. 7 N
d. 6 N
11. The resultant of two vectors having magnitude 10N and 8N cannot be:
a. 18N
b. 2N
c. 20N
d. 9N
12. The reverse process of vector addition is called:
a. Negative of a vector
b. Subtraction of vectors
c. Multiplication of a vector
d. Resolution of a vector
13. The resultant of 120N and 20N forces cannot be:
a. 101N
b. 141N
c. 130N
d. 100N
14. The angle of →A = Ax i^– Ay j^ with x-axis will be in between:
a. 180º and 270º
b. 0º and 90º
c. 270º and 360º
d. 90º and 180º
15. If two unit vectors perpendicular in each other are added, magnitude of resultant:
a. 1/√2
b. 2
c. 4
d. √2
16. Two vectors can be added by simple arithmetical method when they are at an angle of:
a. 45o
b. 120o
c. 0o
d. 90o
17. The resultant of two forces 30 N and 40 N acting parallel to each other is:
a. 70N
b. 30N
c. 10N
d. 40N
18. If the resultant of two vectors each of magnitude F is also of magnitude F,the angle between them will be:
a. 90o
b. 30o
c. 120o
d. 60o
19. The magnitude of a vector →r = ( 3i^ + 6j^ + 2k^ ) is
a. 7
b. -1
c. 8
d. -7
20. Maximum number of components of a vector may be:
a. Three
b. One
c. Infinite
d. Two
21. The magnitude of →A will be:
a. 1
b. Zero
c. A
d. A2
22. A force of 10N makes an angle of 30 with y-axis. The magnitude of x-component will be:
a. 10 N
b. 5 N
c. Zero
d. 8.66 N
23. A force for 100N makes an angle of 60 with y-axis, its horizontal component is:
a. 70.7 N
b. 50N
c. 86.6 N
d. 60N
24. Minimum number of unequal forces whose vector sum can be zero are:
a. 3
b. 5
c. 2
d. 4
25. If a vector →A makes an angle with x-axis then its x-component is:
a. A
b. A cos θ
c. A sin θ
d. A2