McqMate
Chapters
1. |
Strength of magnetic field is known as |
A. | flux |
B. | density |
C. | magnetic strength |
D. | magnetic flux density |
Answer» D. magnetic flux density |
2. |
Unit of luminous intensity is |
A. | m |
B. | kg |
C. | cd |
D. | mol |
Answer» C. cd |
3. |
For a hydrogen atom the electrical force as compared to gravitational force is{{}} |
A. | 1039 times |
B. | 10 40 times |
C. | 10 41 times |
D. | 10 42 times |
Answer» A. 1039 times |
4. |
Weakest force in nature is |
A. | electric force |
B. | gravitational force |
C. | weak force |
D. | magnetic force |
Answer» B. gravitational force |
5. |
Magnetic field can be produced by using |
A. | permanent magnet |
B. | electric current |
C. | temporary magnet |
D. | both A and B |
Answer» D. both A and B |
6. |
Whenever there is force on magnetic pole, there exists |
A. | magnetic field |
B. | electric field |
C. | current |
D. | voltage |
Answer» A. magnetic field |
7. |
If the magnetic flux density and current are at right angles, then component of force acting on the conductor is |
A. | BIL cosθ |
B. | BIL sinθ |
C. | BIL tanθ |
D. | BL sinθ |
Answer» B. BIL sinθ |
8. |
Unraveling an electromagnetic gives |
A. | stronger field |
B. | weaker field |
C. | moderate field |
D. | wider field |
Answer» B. weaker field |
9. |
Force per meter on two wires carrying a current of 1 A placed 1 m apart is equal to {{}} |
A. | 6.7 × 10 -11 N |
B. | 9.0 × 10 9 N |
C. | 2.0 × 10 -7 N |
D. | 3.0 × 10 -4 N |
Answer» C. 2.0 × 10 -7 N |
10. |
F = BIL can only be used if the magnetic field and electric current are |
A. | at right angles to each other |
B. | in same direction |
C. | anti-parallel to each other |
D. | anti-perpendicular to each other |
Answer» A. at right angles to each other |
11. |
Derived unit Tesla is related to |
A. | A |
B. | kg |
C. | s |
D. | all of above |
Answer» D. all of above |
12. |
If we reverse the direction of electric current, then the direction of magnetic field will be |
A. | reversed |
B. | remains same |
C. | becomes tangent |
D. | becomes normal |
Answer» A. reversed |
13. |
1 Tesla is equal to {{}} |
A. | 50 N A-1 m-1 |
B. | 100 N A-1 m-1 |
C. | 1 N A-1 m-1 |
D. | 1000 N A-1 m-1 |
Answer» C. 1 N A-1 m-1 |
14. |
Field which does not have magnetic poles is |
A. | straight lined |
B. | normal to the wire |
C. | tangent to the wire |
D. | circular |
Answer» D. circular |
15. |
A flat coil and solenoid has |
A. | different fields |
B. | same physical properties |
C. | same fields |
D. | same chemical properties |
Answer» C. same fields |
16. |
Flux density is defined by {{}} |
A. | FIL |
B. | F⁄(IL |
C. | IL |
D. | I⁄(FL |
Answer» B. F⁄(IL |
17. |
Strength of magnetic field of solenoid can be increased by adding core made of |
A. | copper |
B. | ferrous |
C. | silver |
D. | aluminum |
Answer» B. ferrous |
18. |
In Fleming's left hand rule, thumb shows direction of |
A. | current |
B. | field |
C. | motion |
D. | charge |
Answer» C. motion |
19. |
If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is |
A. | thrice the Earth's magnetic flux density |
B. | four times the Earth's magnetic flux density |
C. | five times the Earth's magnetic flux density |
D. | twice the Earth's magnetic flux density |
Answer» D. twice the Earth's magnetic flux density |
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