Physics MCqs Chapter 2nd For 1st Year

These mcqs are prepared from physics 1st year chapter 2 especially for medical/Engineering entry test by our team in order to help new students.

1- Whats the resultant of 3N and 4N forces acting at right angles

a-90N1

b-5N

c-7N

d-1N

2-If A cross B is along z-axis then vectors A and B will lie in

a- zx plane

b- xy plane

c- yz plane

d-none

3-If A= 2i+4j+5k and B=-2i+2j+k. then A.B is

a-o

b-1

c--1

d-2

4-Parallel vectors of same magnitude 

a-equal

b-unequal

c-when added, give the sum zero

d-when multiplied give the sum zero

5-When the magnitude of two components of vectors are equal to that of their resultant, then the angle b/w components id

a-60

b-90

c-120

d-none

6-If two unit vectors are inclined at angle of 90, then magnitude of their resultant is

a-2

b- 2^1/2

c-under root 3

d-zero

7-If the vectors A and B represented in such a way that A+B=A-B, then the angle b/w A and B ia

a-o

b-60

c-90

d-180

8-The magnitude of dot and cross product of two vectors is 10 in each case. find the angle b/w two vectors

a-45

b-60

c-90

d-o

9-If A*B=-B*A then angle b/w A and B is

a-180

b180/3

c-180/2

d-180/4

10-Which of the following physical quantities are represented by axial vectors

a-displacement

b-force

c-velocity

d-torque

11-The two vectors have magnitude 3 and 5. if angle b/w them is 60, then dot product of two vectors is

a-7.5

b-6.5

c-8.4

d-7.9

12-The minimum number of vectors of equal magnitude required to produce a zero resultant is

a-2

b-4

c-3

d-none

13-The minimum number of vectors of unequal magnitude required to produce a zero resultant is

a-2

b-3

c-4

d-infinity

14-two forces of numerically equal to 10dynes  are acting ,then the resultant is

a-10dynes

b-20dynes

c-10(3)^1/2 dyne

d-5dynes

15-what is the angle between  i+j+k and i

a-180/6

b-180/4

c-180/3

d-none