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## MAGNETISM AND MATTER Quiz-11

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1. The magnetic lines of force inside a bar magnet
•  Are from north-pole to south-pole of the magnet
•  Do not exist
•  Depend upon the area of cross-section of the bar magnet
•  Are from south-pole to north-pole of the magnet
Solution
Inside bar magnet, lines of force are from south to north.

Q2. A current loop placed in a magnetic field behaves like a
•  Magnetic dipole
•  Magnetic substance
•  Magnetic pole
•  All are true
Solution
Magnetic dipole

Q3. Two small bar magnets are placed in a line with like poles facing each other at a certain distance d apart. If the length of each magnet is negligible as compared to d, the force between them will be inversely proportional to
•  d
•  d2
•  1/d2
•  d4
Solution

Q4. Magnetic dipole moment is a
•  Scalar quantity
•  Vector quantity
•  Constant quantity
•  None of these
Solution
vector quantity

Q5.The materials suitable for making electromagnets should have
•  High retentivity and high coercivity
•  Low retentivity and low coercivity
•  High retentivity and low coercivity
•  Low retentivity and high coercivity
Solution
Electromagnets are made of soft iron. The soft iron has high retentivity and low corectivity.

Q6. Isogonic lines on magnetic map will have
•  Zero angle of dip
•  Zero angle of declination
• Same angle of declination
•  Same angle of dip
Solution
Same angle of declination

Q7.The time period of a vibration magnetometer is T0. Its magnet is replaced by another magnet whose moment of inertia is 3 times and magnetic moment is 1/3 of the initial magnet. The time period now will be
•  3T0
•  T0
•  T0/√3
•  T0/3
Solution

Q8.If magnetic lines of force are drawn by keeping magnet vertical, then number of neutral points will be
•  One
•  Two
•  Four
•  Five
Solution
One

Q9.The magnetic moment of a magnet is 0.1 amp ×m2. It is suspended in a magnetic field of intensity3×10-4 Wbm-2. The couple acting upon it when deflected by 30° from the magnetic field is
•  1×10-5N m
•  1×10-5N m
•  2 ×10-5N m
•  2.5 ×10-5N m
Solution
Ï„=MB sinÎ¸=0.1×3×10-4 sin30° =1.5×10-5 N-m

Q10. The variation of magnetic susceptibility (Ï‡) with magnetising field for a paramagnetic substance is
•

•

•

Solution
Susceptibility of a paramagnetic substance is independent of magnetising field

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