Physics Solved Mcqs Test

1. A vector is described by magnitude as well as: a) Angle b)

Distance c) Direction d) Height

C

2. Addition, subtraction and multiplication of scalars is done by: a)

Algebraic principles b) Simple arithmetical rules c) Logical methods

d) Vector algebra

A

3. The direction of a vector in a plane is measured with respect to two

straight lines which are _______ to each other. a) Parallel b)

Perpendicular c) At an angle of 60o d) Equal

B

4. A unit vector is obtained by dividing the given vector by: a) its

magnitude b) its angle c) Another vector d) Ten

A

5. Unit vector along the three mutually perpendicular axes x, y and z are

denoted by: a) aˆ , bˆ , cˆ b) iˆ , jˆ , kˆ c) pˆ , qˆ , rˆ d) xˆ , yˆ , zˆ

B

6. Negative of a vector has direction _______ that of the original vector.

a) Same as b) Perpendicular to c) Opposite to d) Inclined to

C

7. There are _______ methods of adding two or more vectors. a) Two

b) Three c) Four d) Five

A

8. The vector obtained by adding two or more vectors is called: a)

Product vector b) Sum vector c) Resultant vector d) Final vector

C

9. Vectors are added according to: a) Left hand rule b) Right hand

rule c) Head to tail rule d) None of the above

C

10. In two-dimensional coordinate system, the components of the origin

are taken as: a) (1, 1) b) (1, 0) c) (0, 1) d) (0, 0)

D

11. The resultant of two or more vectors is obtained by: a) Joining the

tail of the first vector with the head of the last vector. b) Joining the head

of the first vector with the tail of the last vector. c) Joining the tail of the

last vector with the head of the first vector. d) Joining the head of the

last vector with the tail of the first vector.

A

12. The position vector of a point p is a vector that represents its position

with respect to: a) Another vector b) Centre of the earth c) Any

point in space d) Origin of the coordinate system

D

13. To subtract a given vector from another, its _______ vector is added to

the other one. a) Double b) Half c) Negative d) Positive

C

14. If a vector is denoted by A then its x-components can be written as: a)

A sinθiˆ b) A sinθ jˆ c) A cos θiˆ d) A cos θ jˆ

C

15. The direction of a vector F can be fond by the formula: a) q = tan-1 A

( x

y

F

F

) b) q = sin-1 ( F

Fx

) c) q = sin-1 ( x

y

F

F

) d) q = tan-1 ( Fy

F

)

16. The y-component of the resultant of h vectors can be obtained by the

formula: a) Ay =

Σ=

n

g 1 Ar cosq r b) Ay =

Σ=

n

g 1 Ar tanq r c) Ay =

Σ=

n

g 1 Ar

tan-1q r d) Ay =

Σ=

n

g 1 Ar sinq r

D

17. The sine of an angle is positive in _______ quadrants. a) First and

Second b) Second and fourth c) First and third d) Third and

fourth

A

18. The cosine of an angle is negative in _______ quadrants. a) Second

and fourth b) Second and third c) First and third d) None of the

above

B

19. The tangent of an angle is positive in _______ quadrants. a) First

and last b) First only c) Second and fourth d) First and third

D

20. If the x-component of the resultant of two vectors is positive and its ycomponent

is negative, the resultant subtends an angle of _______ on xaxes.

a) 360o – q b) 180o + q c) 180o + q d) q

A

21. Scalar product is obtained when: a) A scalar is multiplied by a scalar

b) A scalar is multiplied by vector c) Two vectors are multiplied to

give a scalar d) Sum of two scalars is taken

C

22. The scalar product of two vectors A and B is written as: a) A ´ B

b) A . B c) A B d) AB

B

23. The scalar product of two vectors F and V with magnitude of F and V

is given by: a) FV sinq b) FV tanq c) V

F

cosq d) FV cosq

D

24. The magnitude of product vectorC i.e. A ´ B =C , is equal to the: a)

Sum of the adjacent sides b) Area of the parallelogram c) Product of

the four sides d) Parameter of the parallelogram

B

25. Work is defined as: a) Scalar product of force and displacement b)

Vector product of force and displacement c) Scalar product of force and

velocity d) Vector product of force and velocity

A

26. The scalar product of a vector A is given by: a) A cosq b) A sinq

c) A tanq d) None of the above

D

27. If two vectors are perpendicular to each other, their dot product is: a)

Product of their magnitude b) Product of their x-components c) Zero

C

d) One

28. If iˆ , jˆ , kˆ are unit vectors along x, y and z-axes then iˆ . jˆ = jˆ . kˆ = kˆ . iˆ =

? a) 1 b) -1 c) – 2

1

d) 0

D

29. iˆ . iˆ = jˆ . jˆ = kˆ . kˆ = _______ a) 0 b) 1 c) -1 d) 2

1 B

30. If dot product of two vectors which are not perpendicular to each

other is zero, then either of the vectors is: a) A unit vector b)

Opposite to the other c) A null vector d) Position vector

C

32. In the vector product of two vectors A & B the direction of the product

vector is: a) Perpendicular to A b) Parallel to B c) Perpendicular to

B d) Perpendicular to the plane joining both A&B

D

34. The magnitude of vector product of two vectors A & B is given by: a)

AB sinq b) AB c) AB cosq d) B

A

tanq

A

35. If iˆ , jˆ , kˆ are unit vectors along x, y and z-axes then kˆ . jˆ = _______

a) iˆ b) jˆ c) – kˆ d) – iˆ

D

36. iˆ ´ iˆ = jˆ ´ jˆ = kˆ ´ kˆ = _______ a) 0 b) 1 c) -1 d) 2

1 A

37. kˆ ´ iˆ = _______ a) jˆ b) – jˆ c) kˆ d) – kˆ A

38. The torque is given by the formula: a) t = g . F b) t = F ´ g c)

t = g ´ F d) t = -g ´ F

C

39. The force on a particle with charge q and velocity in a magnetic field

B is given by: a) q (V ´ B ) b) -q (V ´ B ) c) q

1

(V ´ B ) d) q

1

( B ´

V )

A

40. The scalar quantities are described by their magnitude and _______ a)

Direction b) Proper unit c) With graph d) None of these

B