## Magnet and it's properties- MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Magnet and it's properties.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. A bar magnet is equivalent to

•  Straight conductor carrying current
•  Toroid carrying current
•  Circular coil carrying current
•  None of these

Circular coil carrying current

Q2. The magnetic lines of force inside a bar magnet

•  Are form south-pole to north - pole of the magnet
•  Are form north – pole to south – pole of the magnet
•  Do not exist
•  Depend upon the area of cross–section of the bar

Are form south-pole to north - pole of the magnet

Q3. A small bar magnet has a magnetic moment 1.2 A -m2.The magnetic field at a distance 0.1 m on its axis will be (u0=4Ï€ X 10-7Tm/A)

•  1.2 X 10-4T
•  2.4 X 10-4T
•  2.4 X 104T
•  1.2 X 102T

2.4 X 10-4T

Q4. A bar magnet of magnetic moment M is placed in a magnetic field of induction B. The torque exerted on it is

•  M . B
•  -M . B
•  M X B
•  -M X B

M X B

Q5. Two identical thin bar magnets each of length l and pole strength m are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is

•  ml
•  2ml
•  √2ml
•  1/2 ml

√2ml

Q6. A magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be

•  M
•  M/2
•  M/4
•  2M

M/2

Q7. Intensity of magnetization is given as

•  Magnetic moment per unit mass
•  Magnetic moment per unit volume
•  Magnetic moment per unit atomic weight
•  None of the above

Magnetic moment per unit volume

Q8. There is no couple acting when two bar magnets are placed coaxial separated by distance because

•  There are no forces on the poles
•  The forces are parallel and their lines of action do not coincide
•  The forces are perpendicular to each other
•  The forces act along the same line

The forces act along the same line

Q9. Which of the following statements in not correct about the magnetic field

•  Magnetic lines of force do not cut each other
•  Insides the magnet the lines go from north to south pole of the magnet
•  The magnetic lines form a closed loop
•  Tangents to the magnetic lines give the direction of the magnetic field.

Insides the magnet the lines go from north to south pole of the magnet

Q10. The magnetic field strength at a point at a distance 'd' from the centre on the axial line of a very short bar magnet of magnetic moment M, is B. The magnetic induction at a distance '2d' from centre, on the equatorial line of a magnet of magnetic moment 8 M, will be

•  4 B
•  B / 2
•  B / 4
•  2 B

B / 2

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