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# Objective questions of magnetism and matter

This assignment contains all type objective questions of magnetism and matter. it will be helpful for the students preparing for class 12th board examination or other competitive examinations like JEE/ NEET .

Magnetism and matter

1. With the tangent galvanometer it is desirable to have a deflection near 45°; then the percentage error:
• (a)is less in the reading of deflection
• (b)is negligible in the reading of deflection
• (c)is less in the measurement of current
• (d)is large in the measurement of current
1. The sensitivity of a moving coil galvanometer depends on:
• (a)the angle of deflection
• (b)the earth’s magnetic field
• (c)torsional constant of the spring
• (d)the moment of inertia of the coil
1. An ammeter can be converted into a voltmeter by connecting:
• (a)a high resistance in series
• (b)a low resistance in parallel
• (c)a low resistance in series
• (d)a high resistance in parallel
1. In a moving coil galvanometer the deflection of the coil θ is related to the electric current I by the relation:
• (a)I ꭀ tan θ       (b) I ꭀ θ                   (c) I ꭀ θ2                      (d) I ꭀ √θ
1. A voltmeter of range 2V and resistance 300 Ω cannot be converted into ammeter of range:
• (a)1 A      (b) 1 mA             (c) 100 mA              (d) 10 mA
1. The effect due to uniform magnetic field on a freely suspended magnetic needle is as follows:
• (a)both torque and net force are present
• (b)torque is present but no net force
• (c)both torque and net force are absent
• (d)net force is present but not torque
1. A voltmeter has a resistance of G ohm and range V volt. The value of resistance used in series to convert it into voltmeter of range nV volt is:
• (a)nG       (b) (n – 1)G               (c) G/n                   (d) G/(n – 1)
1. An ammeter has a resistance of G ohm and a range of I The value of resistance used in parallel to convert it into an ammeter of range nI amp is:
• (a)nG       (b) (n – 1)G               (c) G/n               (d) G/(n – 1)
1. To reduce the range of a voltmeter, its resistance need to be reduced. Which of the following resistance when connected in parallel will convert it into a voltmeter of range (V/n)?
• (a)nR0 (b) (n + 1)R0     (c) (n – 1)R0        (d) None of these

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