NCERT Class 11 Physics Objective type Questions & Answers

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

NCERT Class 11 Physics Objective type Questions & Answers

51 The resistivity of alloy manganin is
A Nearly independent of temperature
B Increases rapidly with increase in temperature
C Decreases with increase in temperature
D Increases rapidly with decrease in temperature

Answer: Nearly independent of temperature
52 A charge is moving across a junction, then
A momentum will be conserved.
B momentum will not be conserved.
C at some places momenturii will be conserved and at some other places momentum will not be conserved.
D none of these.

Answer: none of these.
53 If the beams of electrons and protons move parallel to each other in the same direction, then they
A attract each other.
B repel each other.
C no relation.
D neither attract nor repel.

Answer: repel each other.
54 A current loop placed in a non-uniform magnetic field experiences
A a force of repulsion.
B a force of attraction.
C a torque but not force.
D a force and a torque.

Answer: a force and a torque.
55 The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into voltmeter that can read upto 50 V. The resistance to be connected in the series with the galvanometer is
A 4960 Ω
B 5040 Ω
C 4050 Ω
D 2010 Ω

Answer: 4960 Ω
56 A current carrying closed loop of an irregular shape lying in more than one plane when placed in uniform magnetic field, the force acting on it
A will be more in the plane where its larger position is covered.
B is zero.
C is infinite.
D may or may not be zero.

Answer: is zero.
57 When there is an electric current through a conducting wire along its length, then an electric field must exist
A outside the wire but normal to it.
B outside the wire but parallel to it.
C inside the wire but parallel to it.
D inside the wire but normal to it.

Answer: inside the wire but parallel to it.
58 A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is
A 4/5 ohm
B 0.5 ohm
C 1.5 ohm
D None of these

Answer: 0.5 ohm
59 A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of μr = 1000. The core is heated beyond the Curie temperature, Tc .
A The H field in the solenoid is (nearly) unchanged but the B field decreases drastically.
B The H and B fields in the solenoid are nearly unchanged.
C The magnetisation in the core reverses direction.
D The magnetisation in the core does not diminishes.

Answer: The H field in the solenoid is (nearly) unchanged but the B field decreases drastically.
60 The primary origin(s) of magnetism lies in
A Pauli exclusion principle.
B polar nature of molecules.
C intrinsic spin of electron.
D None of these.

Answer: polar nature of molecules.

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