Magnetic Force, Class 10 Science NCERT Solutions

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. If a charged particle does not experience any force in a magnetic field, then…

  it is stationary.

 it moves in the direction parallel to magnetic field

 both (A) and (B)

 it moves perpendicularly to the field.

Question 1 of 10

2. The function of commutator or slip ring is to

  increase the current flowing through the coil

 change the direction of current through coil

 decrease the current flowing through the coil

 change the direction of magnetic field

Question 2 of 10

3. As shown in the diagram, a wire carrying a current pointing out of the paper is placed in a magnetic field. Towards which of the following points does the wire move?

 P

 Q

 S

 R

Question 3 of 10

4. An electron enters a magnetic field at right angles to it, as shown in figure. The direction of force acting on the electron will

  into the screen

 to the right

 out of the screen

 to the left

Question 4 of 10

5. Which of the following property of a proton can change while it moves freely in magnetic field?

  mass

 inertia

 size

 velocity

Question 5 of 10

6. A beam of alpha particles enters a chamber moving along the magnetic field. The force acting on them is

  Maximum and perpendicular to the magnetic field

 Maximum and along the magnetic field

 Minimum and perpendicular to the magnetic field

 Zero

Question 6 of 10

7. A uniform magnetic field exists in the plane of paper pointing from left to right as shown in figure. In the field, an electron and a proton move as shown. The electron and the proton experience:

  force pointing out of the plane of paper.

 force pointing opposite and along the direction of the uniform magnetic field respectively.

 force pointing into the plane of paper.

 force pointing into the plane of paper and out of the plane of paper, respectively.

Question 7 of 10

8. A fixed wire AB carries current I. An electron is moving parallel to the wire. In which direction does the electron tend to move?

  towards west

 downwards

 towards east

 upwards

Question 8 of 10

9. Which of the following concerning a d.c. motor is correct?
(1) It converts electrical energy to mechanical energy.
(2) The commutator rotates together with the coil in the magnetic field.

 (1) only

 (2) only

 (1) and (2) both

 Both are incorrect

Question 9 of 10

10. When the direction of current through the conductor is reversed, then direction of

  force is also reversed

 force remains same

 electromagnetic field is reversed

 electric field is also reversed

Question 10 of 10

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