Physics Chapter 8 Entry test MCQs
Topic 8
ElectroMegnatism
1. Which of the following will experience a maximum force, when projected with the same velocity perpendicular to the magnetic field: (I) alpha-particle and (ii) Beta-particle
a. a-particle
b. B-particle
c. Both a-particle and B-particle
d. None
2. Two parallel wires carrying currents in the opposite directions
a. Have no effect upon each other
b. Repel each other
c. They cancel out their individual magnetic fields
d. Attract each other
3. The direction of the magnetic lines of force depends upon:
a. Area of the conducting wire
b. Nature of the material of the conducting wire
c. Direction of the current
d. Amount of the current
4. The direction of magnetic field at a point on the magnetic lines of force can be taken along:
a. The tangent at that point
b. Normal at that point
c. Can’t be taken
d. Axis of the magnetic line of force at that point
5. The direction of the magnetic lines of force can be found by using:
a. Henry’s law
b. Right hand rule
c. Faraday’s law
d. Left hand rule
6. A uniform magnetic field is represented by a set of lines of force which are
a. Divergent
b. Parallel
c. Convergent
d. None of these
7. When a current carrying conductor is placed in a magnetic field. It moves from a region of
a. Strong to weak if current is large
b. Stronger to weak field
c. Weak to strong if current is large
d. Weak to strong field
8. Magnetic lines of force
a. Are always in closed shape
b. Always intersect
c. Do not pass through vacuum
d. Tend to crowd far away from the poles of a magnet
9. A magnetic needle is kept in a non-uniform magnetic field. It experiences
a. A torque but not a force
b. Neither a force on a torque
c. A force and a torque
d. A force but not a torque
10. Which of the following quantity is not affected by a magnetic field?
a. Moving charge
b. Stationary charge
c. Current flowing in a conductor
d. Change in magnetic flux
11. A straight current carrying conductor is shown in figure. A person observes it from below at paint “B”. What must be direction of magnetic field observed?
a. Anti-clock wise
b. Clock-wise
c. Into the paper
d. Out of paper
12. Magnetic field has its application in————.
a. Generators
b. Motors
c. Current detector
d. All
13. A conductor is shown in the figure connected with the terminals of a source as shown. What is true about this?
a. vec B is present outside conductor
b. vec B present inside conductor
c. vec B outside while vec E is inside conductor
d. vec B vec E both are present inside conductor
14. A square coil 10-2 m2 area is placed perpendicular to a uniform magnetic field of strength 103 web / (m2) The magnetic flux through the coil.
a. 10-5 weber
b. 10 weber
c. 10° weber
d. 105 weber
15. A magnetic field of 2.5 T passes flux associated with the disc. perpendicular to a disc of radius 2cm. Find the magnetic
a. 3.14 x 10-2 Wb
b. 3.14 x 10-3 Wb
c. 3.14 x 10-5 Wb
d. 3.14 x 10-4 Wb
16. A coil of area of cross section 10-2 m2 and 100 turns is placed in a magnetic field of IT, with its axis making an angle 60 deg with the field. Find the total flux associated with the field.
a. 0.4 Wb
b. 0.5 Wb
c. 0.2 Wb
d. 0.3 Wb
17. When the coil is rotated between the pole pieces of a magnet, during one complete rotation of the coil, how aften will the magnetic flux linked with coil be maximum and minimum?
a. Maximum and minimum twice each
b. Maximum and minimum once each
c. Maximum twice, minimum once
d. Maximum once minimum twice
18. When area is placed perpendicular to external magnetic field the magnetic flux will be?
a. Maximum
b. Minimum
c. In between maximum and minimum
d. None
19. Direction of magnetic flux is
a. Parallel to the surface
b. Normal to the surface
c. No direction
d. At any angle
20. If 0.5 T magnetic field is perpendicular to the 0.5m ^ 2 area then the magnetic flux would be
a. 6.25 Wb
b. 0.25 Wb
c. Zero
d. 1.25 Wb
21. 20 Wb magnetic flux passes through the 5m2 area of certain sheet, the magnetic flux density would be
a. Wb m-2
b. 2Wb m-2
c. 8Wb m-2
d. 6Wb m-2
22. The Relationship between tesla(T) and smaller gauss(G) of magnetic induction is given by
a. 1T = 10-2 G
b. IT = 103 G
c. 1T = 104 G
d. IT = 10-4 G
23. Weber ampere per metre is equal to
a. Watt
b. Joule
c. Henry
d. Newton
24. The unit of magnetic flux density is
a. Tesla
b. Wbm-2
c. NA-1m-1
d. All of these
25. The magnetic induction B is also called the
a. Density
b. Flux
c. Tesla
d. Flux density