Physics Chapter 8 Entry test MCQs
26. A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 T. The force on the proton is:
a. 8 x 10-11N
b. 2.5 x 10-10 N
c. 8 x 10-12N
d. 2.5 x 10-11 N
27. The magnitude of the force on a moving charge is maximum when angle between the velocity of the charge and the magnetic field is,
a. 180°
b. 0°
c. 45°
d. 90°
28. If a charge particle enters a uniform magnetic field, there is a change in its
a. Magnitude of velocity
b. Direction of velocity
c. Kinetic energy
d. All of these
29. A fig shows a uniform Magnetic Field B directed into plan of paper. A particle with negative charge moves in the plan, which of four paths 1,2,3 or 4 does the particle follow
a. Path 1
b. Path 3
c. Path 2
d. Path 4
30. Which of the following Statements is false?
a. A moving charge with uniform speed produces a constant magnetic field.
b. A stationary charge produces a constant electric field
c. A conductor carrying steady current has no electric field in it
d. An accelerated charge produces combination of varying electric and magnetic field
31. In the given figure the electron enters into the magnetic field. It deflects in…… direction
a. .+ ve Y direction
b. +ve X direction
c. ve Y direction
d. -ve X direction
32. In the formula F= q (V x C)
a. F must be perpendicular to v but not necessarily to B
b. V must be perpendicular to B but not necessarily to F
c. F must be perpendicular to both v and B
d. All three vectors must be mutually perpendicular
33. In the figure below what is the direction of the magnetic force FB ?
a. To the right
b. downward, in the plane of the page
c. upward, in the plane of the page
d. out of the plane of the page
34. Which of the following cannot be deflected by a magnetic field?
a. Beta rays
b. Alpha rays
c. Cosmic rays
d. Gamma rays
35. The following diagram shows an electron passing through a magnetic field. Which diagram shows the possible path of the electrons as they pass through the field?
36. Work done by magnetic force on a moving charge particle is
a. Negative
b. Positive
c. Infinite
d. Zero
37. A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
a. Move in a circular orbit with its speed unchanged
b. Continue to move due east
c. Get deflected vertically upwards
d. Move in a circular orbit with its speed increases
38. A strong magnetic field is applied to a stationary electron, then
a. Electron move opposite to field
b. Electron move in the direction of field
c. Electron remain stationary
d. Electron start spinning
39. The magnitude of force on a moving charge is zero then angle between the velocity of the charge carrier and magnetic field is
a. 90°
b. 0°
c. 120°
d. 45°
40. An electron enters in a uniform magnetic field making an angle 60° with field. The shape of its trajectory in magnetic field is
a. Parabola
b. Circle
c. Helix
d. Straight line
41. Which of the following in motion cannot be deflected by magnetic field?
a. Neutron
b. Electron
c. Sodium ion
d. Proton
42. When a charged particle is projected perpendicularly in a magnetic field its trajectory is
a. Helix
b. Hyperbola
c. Circular
d. Parabola
43. When a charged particle moves through a magnetic field, it suffers a change in
a. Speed
b. Direction
c. No change
d. Energy
44. Magnetic field is caused by
a. A moving positive charge only
b. Stationary charge
c. Moving positive and negative charges both
d. A moving negative charge only
45. A charged particle moves through a magnetic field in a direction perpendicular to it. Which of the following remain unchanged for the particle?
a. Acceleration
b. Velocity
c. Direction
d. Speed
46. The diagram shows an electron as it enters in magnetic field. The path of electron and the magnetic field are in plane of paper.in which direction is the electron initially deflected?
a. into the plane of the paper
b. to the left of its incoming path
c. out of the plan of the paper
d. to the right of its incoming path
47. An electron moves in the negative x direction, through a uniform magnetic field in the negative y direction. The magnetic force on the electron is
a. In the positive z direction
b. In the negative z direction
c. In the positive y direction
d. In the negative y direction
PAST PAPER MCQS
48. An electric charge in uniform motion produces:
a. An electric field
b. A magnetic field
c. Both magnetic and electric fields
d. A magnetic field
49. A charge of two micro coulombs (2mu*C) moves with velocity of two meter per second ( 2m /sec) in the direction of two field. The force that will act on it will be:
a. 8N
b. 2N
c. 4N
d. Zero
50. Force experienced by a moving charge in a magnetic field is:
a. F = q(V x B)
b. F = BA cosθ
c. F = I(L x B)
d. F = µo NI