NCERT Class 11 Physics Optional Questions with Answers

NCERT Class 11 Physics Multiple Choice Questions(MCQs) & Answers NCERT Class 11 Physics QUESTIONS

NCERT Class 11 Physics Optional Questions with Answers

41 A positive charge enters in a magnetic field and travels parallel to but opposite the field. If experiences
A an upward force.
B a downward force.
C an accelerated force.
D no force.

Answer: an accelerated force.
42 A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system
A decreases by a factor of 2.
B remains the same.
C increases by a factor of 4.
D increases by a factor of 2.

Answer: decreases by a factor of 2.
43 A conductor with a positive charge
A may be at +ve, zero or -ve potential.
B is always at negative potential.
C is always at +ve potential.
D is always at zero potential.

Answer: may be at +ve, zero or -ve potential.
44 If the magnetising field on a ferromagnetic material is increased, its permeability.
A is decreased
B is increased
C is unaffected
D may be increased or decreased.

Answer: is decreased
45 Lines of force, due to earth’s horizontal magnetic field, are
A parallel and straight
B concentric circles
C curved lines
D elliptical

Answer: parallel and straight
46 Angle of dip is 90° at
A poles.
B tropic of cancer.
C equator.
D both at equator and poles.

Answer: poles.
47 Consider a current carrying wire current I in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while die current/remain unaffected. The agent that is essentially responsible for is
A source of emf.
B electric field produced by charges accumulated on the surface of wire.
C the charges just behind a given segment of wire which push them just the right way by repulsion.
D the charges ahead.

Answer: electric field produced by charges accumulated on the surface of wire.
48 Which of the following is not correct about cyclotron?
A It is a machine to accelerate charged particles or ions to high energies.
B Cyclotron uses both electric and magnetic fields in combination to increase the energy of charged particles.
C The operation of the cyclotron is based on the fact that the time for one revolution of an ion is independent of its speed or radius of its orbit.
D The charged particles and ions in cyclotron can move on any arbitrary path.

Answer: The charged particles and ions in cyclotron can move on any arbitrary path.
49 For equilibrium, the net moment acting on the body by various conservative forces is _____:
A Zero
B Three
C One
D Two

Answer: Zero
50 Essential difference between electrostatic shielding by a conducting shell and magne-tostatic shielding is due to
A electrostatic field lines cannot end on ’ charges and conductors do not have free charges.
B lines of B can also end but conductors cannot end them.
C lines of B cannot end. on any material and perfect shielding is not possible.
D shells of high permeability materials cannot be used to divert lines of B from the interior region.

Answer: lines of B cannot end. on any material and perfect shielding is not possible.

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