McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering , Electronics and Communication Engineering .
| 1. |
A scalar quantity has __________. |
| A. | magnitude |
| B. | direction |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» A. magnitude | |
| 2. |
Which of the following is/are scalar quantity(s)? |
| A. | distance |
| B. | density |
| C. | temperature |
| D. | all of these |
| Answer» D. all of these | |
| 3. |
Which of the following is not a scalar quantity? |
| A. | entropy |
| B. | displacement |
| C. | volume |
| D. | mas |
| Answer» B. displacement | |
| 4. |
A vector quantity has __________. |
| A. | magnitude |
| B. | direction |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 5. |
Which of the following is/are vector quantity(s)? |
| A. | force |
| B. | electric field intensity |
| C. | acceleration |
| D. | all of these |
| Answer» D. all of these | |
| 6. |
A unit vector has its magnitude as ____________. |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | none of these |
| Answer» B. 1 | |
| 7. |
A unit vector has _______ direction to that of the main vector. |
| A. | same |
| B. | opposite |
| C. | normal upwards |
| D. | normal downwards |
| Answer» A. same | |
| 8. |
A vector P in Cartesian coordinates is represented by ____________. |
| A. | (Px, Pφ, Pz) |
| B. | (Px, Py, Pz) |
| C. | (Px, Pφ, Pθ) |
| D. | none of these |
| Answer» B. (Px, Py, Pz) | |
| 9. |
________ of two vectors uses the Law of Parallelogram. |
| A. | multiplication |
| B. | division |
| C. | addition |
| D. | all of these |
| Answer» C. addition | |
| 10. |
Multiplication of two vectors is __________. |
| A. | vector |
| B. | scalar |
| C. | either vector or scalar |
| D. | cannot say |
| Answer» C. either vector or scalar | |
| 11. |
If two vectors are orthogonal, then their scalar product is __________. |
| A. | 1 |
| B. | 0 |
| C. | ∞ |
| D. | 100 |
| Answer» B. 0 | |
| 12. |
___________ product is governed by the Right-Hand Screw Rule. |
| A. | vector |
| B. | scalar |
| C. | simple mathematical |
| D. | none of these |
| Answer» A. vector | |
| 13. |
The vector product obeys the __________ law. |
| A. | Commutative |
| B. | Associative |
| C. | Distributive |
| D. | Parallelogram |
| Answer» C. Distributive | |
| 14. |
The cross product of the same vector to itself is ____________. |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | 100 |
| Answer» A. 0 | |
| 15. |
____________ product of two unit vectors is the third unit vector. |
| A. | vector |
| B. | scalar |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» A. vector | |
| 16. |
'r' in Cylindrical coordinates corresponding to Cartesian coordinate (3, 4, 5) is ____________. |
| A. | 12 |
| B. | 7 |
| C. | 10 |
| D. | 5 |
| Answer» D. 5 | |
| 17. |
In a Cartesian coordinate system, axes x, y and z are at __________ to each other. |
| A. | 45° |
| B. | 90° |
| C. | 120° |
| D. | 180° |
| Answer» B. 90° | |
| 18. |
Cartesian coordinates are represented in terms of ___________. |
| A. | (r, φ, z) |
| B. | (r, θ, φ) |
| C. | (x, y, z) |
| D. | all of these |
| Answer» C. (x, y, z) | |
| 19. |
Cylindrical coordinates are represented in terms of ____________. |
| A. | (r, φ, z) |
| B. | (r, θ, φ) |
| C. | (x, y, z) |
| D. | all of these |
| Answer» A. (r, φ, z) | |
| 20. |
Spherical coordinates are represented in terms of ___________. |
| A. | (r, φ, z) |
| B. | (r, θ, φ) |
| C. | (x, y, z) |
| D. | all of these |
| Answer» B. (r, θ, φ) | |
| 21. |
In Cylindrical coordinate systems, unit vector ar is __________. |
| A. | directed outwards radially |
| B. | normal to cylindrical surface at a point |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 22. |
Cylindrical coordinate 'r' is related to the Cartesian coordinate as __________. |
| A. | (x, y) |
| B. | (x + y) |
| C. | (x2/y2) |
| D. | (x2 + y2)1/2 |
| Answer» D. (x2 + y2)1/2 | |
| 23. |
Cylindrical coordinate 'z' is related to the Cartesian coordinate as __________. |
| A. | tan−1(y/x) |
| B. | z |
| C. | xy/z |
| D. | cot z |
| Answer» B. z | |
| 24. |
In a Spherical coordinate system, φ is ____________. |
| A. | angle of elevation |
| B. | azimuthal angle |
| C. | distant from the origin to the point |
| D. | all of these |
| Answer» B. azimuthal angle | |
| 25. |
Spherical coordinate system is a _________. |
| A. | right-handed syste. |
| B. | left-handed system |
| C. | both (a)and (b) |
| D. | none of these |
| Answer» A. right-handed syste. | |
| 26. |
In a Spherical coordinate system, φ is given as _________. |
| A. | y/x |
| B. | x/y |
| C. | tan−1(y/x) |
| D. | tan−1(x/y) |
| Answer» C. tan−1(y/x) | |
| 27. |
In a Spherical coordinate system, r is given as ___________. |
| A. | (x + y + z) |
| B. | (x2 + y2 + z2) |
| C. | (x2 + y2 + z2)1/2 |
| D. | none |
| Answer» C. (x2 + y2 + z2)1/2 | |
| 28. |
For transformation from the Cartesian coordinate system to Spherical coordinate system, ap should be equal to ____________. |
| A. | cos θ |
| B. | − cos θ |
| C. | sin θ |
| D. | − sin θ |
| Answer» A. cos θ | |
| 29. |
In terms of Spherical coordinate system variables, y of Cartesian coordinate system is given as __________. |
| A. | r sin θ cos φ |
| B. | r sin θ sin φ |
| C. | r cos θ sin φ |
| D. | r cos θ cos φ |
| Answer» B. r sin θ sin φ | |
| 30. |
In the Cylindrical coordinate system, z ranges between____________. |
| A. | 0 and 1 |
| B. | −∞ and 0 |
| C. | 0 and −∞ |
| D. | −∞ and ∞ |
| Answer» D. −∞ and ∞ | |
| 31. |
In the Cylindrical coordinate system, φ ranges from _____________. |
| A. | 0 to less than π |
| B. | 0 to less than 2π |
| C. | 0 to less than 3π |
| D. | 0 to less than 4π |
| Answer» B. 0 to less than 2π | |
| 32. |
Line integral involves _________ product. |
| A. | scalar |
| B. | vector |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» A. scalar | |
| 33. |
Del operator is ______________. |
| A. | same as the gradient operator |
| B. | vector differential operator |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» C. both (a) an (b) | |
| 34. |
Gradient represents the __________ of maximum space rate of increase of a scalar field. |
| A. | magnitude |
| B. | direction |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» C. both (a) an (b) | |
| 35. |
(AB) is equal to ___________. |
| A. | A. B |
| B. | A + B |
| C. | 2AB |
| D. | B A + A B |
| Answer» D. B A + A B | |
| 36. |
An is equal to _____________. |
| A. | n A |
| B. | nAn−1 A |
| C. | nAn A |
| D. | nA |
| Answer» B. nAn−1 A | |
| 37. |
Divergence of a vector at a point in a vector field is __________ quantity. |
| A. | vector |
| B. | scalar |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» B. scalar | |
| 38. |
Divergence of vector field is net outward flux of a vector per unit ______. |
| A. | surface area |
| B. | volume |
| C. | length |
| D. | none of these |
| Answer» B. volume | |
| 39. |
Divergence at a point is positive if field lines are _________ |
| A. | diverging |
| B. | converging |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» A. diverging | |
| 40. |
If the rate at which field lines enter into a small volume and also leave, then divergence is ________. |
| A. | ∞ |
| B. | 1 |
| C. | 0 |
| D. | −1 |
| Answer» C. 0 | |
| 41. |
Divergence Theorem is applicable for a ________ that is bounded by a _________. |
| A. | volume, surface |
| B. | surface, volume |
| C. | surface, line |
| D. | line, surface |
| Answer» A. volume, surface | |
| 42. |
Divergence Theorem relates ________ integral to __________ integral. |
| A. | surface, volume |
| B. | line, surface |
| C. | volume, line |
| D. | all of these |
| Answer» A. surface, volume | |
| 43. |
Curl measures _________. |
| A. | rate of change of vector |
| B. | circular rotation |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 44. |
Stoke's Theorem relates, ______ integral to a _______ integral. |
| A. | volume, surface |
| B. | volume, line |
| C. | line, surface |
| D. | all of these |
| Answer» C. line, surface | |
| 45. |
Laplacian operator ________. |
| A. | is a scalar function |
| B. | is a vector function |
| C. | can be a scalar or vector function |
| D. | none of these |
| Answer» C. can be a scalar or vector function | |
| 46. |
Laplacian of a scalar is __________. |
| A. | scalar |
| B. | vector |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» A. scalar | |
| 47. |
Laplacian of a vector is ___________ of gradient of its divergence and its curl of curl. |
| A. | addition |
| B. | difference |
| C. | multiplication |
| D. | division |
| Answer» B. difference | |
| 48. |
A scalar field is harmonic in a given region, if its Laplacian is __________. |
| A. | ∞ |
| B. | −1 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 49. |
Metals have their conductivity "σ" _________. |
| A. | >>1 |
| B. | <<1 |
| C. | 0 |
| D. | none of these |
| Answer» A. >>1 | |
| 50. |
Insulators have their conductivity "σ" _________. |
| A. | >>1 |
| B. | <<1 |
| C. | 0 |
| D. | none of these |
| Answer» B. <<1 | |
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