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## MAGNETISM AND MATTER Quiz-18

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 magnetism of a magnet is due to
•  The earth
•  Cosmic rays
•  The spin motion of electrons
•  Pressure of big magnet inside the earth
Solution
The magnetism of the magnet is due to the spin motion of electrons.

Q2. Which curve may best represent the current deflection in a tangent galvanometer

•  A
•  B
•  C
•  D
Solution
i∝ tan⁡Î¸

Q3. The period of oscillation of a vibration magnetometer depends on which of the following factors Where I is the moment of inertia of the magnet about the axis of suspension, M is the magnetic moment of the magnet and H is the external magnetic field
•  I and M only
•  M and H only
•  I and H only
•  I,M and H only
Solution
It is a fact.

Q4. Two short magnets AB and CD are in the X-Y plane and are parallel to X-axis and co-ordinates of their centers respectively are (0, 2) and (2, 0). Line joining the north-south poles of CD is opposite to that of AB and lies along the positive X-axis. The resultant field induction due to AB and CD at a point P(2, 2) is 100×10-7 T. When the poles of the magnet CD are reversed, the resultant field induction is 50×10-7 T. The value of magnetic moments of AB and CD(in Am2) are
•  300; 200
•  600; 400
•  200; 100
•  300; 150
Solution

As shown in figure,

Q5. The time period of a bar magnet suspended horizontally in the earth’s magnetic field and allowed to oscillate
•  Is directly proportional to the square root of its mass
•  Is directly proportional to its pole strength
•  Is inversely proportional to its magnetic moment
•  Decrease if the length increases but pole strength remains same
Solution

Q6. The needle of a deflection galvanometer shows a deflection of 60° due to a short bar magnet at a certain distance in tan Aposition. If the distance is double the deflection is
•  sin-1[√3/8]
•  cos-1[√3/8]
•  tan-1[√3/8]
•  cot-1[√3/8]
Solution
For short bar magnet in tan Aposition

When distance is doubled, then new deflection Î¸' is given by

Q7. Aurora Borealis is a luminous electrical discharge in the upper layers of the atmosphere, which is visible more frequently in
•  Polar regions
•  Equator
•  Lunar eclipse
•  Regions of earth’s magnetic poles
Solution
This luminous electrical discharge is visible frequently in regions of earth’s magnetic poles

Q8. The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing
•  North
•  South
•  East
•  West
Solution

N1 and N2 are two null points. And BH= Horizontal component of earth’s magnetic field B= Magnetic field due to bar magnets

Q9. Each atom of an iron bar (5cm×1cm×1cm) has a magnetic moment 1.8×10-23 Am2. Knowing that the density of iron is 7.78×103 kg m-3, atomic weight is 56 and Avogadro’s number of 6.02×1023 the magnetic moment of bar in the state of magnetic saturation will be
•  4.75 Am2
•  5.74 Am2
•  7.54 Am2
•  75.4 Am2
Solution
The number of atoms per unit volume in a specimen

Q10. Magnetic meridian is a
•  Point
•  Horizontal plane
•  Vertical plane
•  Line along N-S
Solution
It is a fact.

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