Srijan Physics Class 9. We covered all the Srijan Physics Class 9 MCQs in this post for free so that you can practice well for the exam.
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Srijan Physics Class 9 Objective for Students
A circular copper disc 10cm in diameter rotates at 1800 rev/minute about an axis through its center and at right angles to the disc. A uniform field of induction B of 1 weber/m² is perpendicular to the axis of the disc and its rim. Find the induced e.m.f.
a. 0.0942 volt
b. 0.942 volt
c. 0.0094 volt
d. 9 volt
Option a – 0.0942 volt
A coil of 200 turns carrying a current of 10 amp produces a magnetic flux of 10 weber. Find the energy stored in a magnetic field.
a. 100 Joules
b. 1000 Joules
c. 10,000 Joules
d. 10 Joules
Option c – 10,000 Joules
A 20 Henry inductor carries a steady current of 2 amp. How can a 200-volt self-inductance e.m.f be made to appear in the inductor?
a. 10 amp/sec.
b. 100 amp/sec.
c. 0.01 amp/sec.
d. 1000 amp/sec.
Option a – 10 amp/sec
A solenoid with a length of 50 cm and having 500 turns and a radius of 2 cm is wound on an iron core of relative permeability 800. What will be the average e.m.f. induced in the solenoid if the current in it changes from 0 to 2 amp in 0.05 seconds?
a. 2.52 volts
b. 25.2 volts
c. 250 volts
d. None
Option b – 25.2 volts
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