Semiconductor MCQ NEET. We covered all the Semiconductor MCQ NEET in this post for free so that you can practice well for the exam.
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MCQ on Semiconductor for NEET Students
In a strong external magnetizing field, a ferromagnetic substance gets strongly magnetized
(A) due to the presence of domain structure.
(B) due to the displacement of boundaries of domains.
(C) due to the rotation of domains.
(D) both (B) and (C)
Option d – both (B) and (C)
A square loop of side ‘a’ m carries a current constant value. The magnetic field at the center of the loop is
(A) proportional to a²
(B) linearly proportional to a
(C) inversely proportional to a
(D) independent of a
Option c – inversely proportional to a
When the energy of the incident radiation is increased by 40%, the kinetic energy of the photoelectrons emitted from a metal surface increases from 0.4 eV to 0.86 eV. The work function of the metal is
(A) 0.75 eV
(B) 1.0 eV
(C) 1.3 Ev
(D) 1.5 Ev
Option a – 0.75 eV
A charged particle is moving clockwise with constant speed then, the magnetic field produced by the charge at a point lying on the axis from a certain distance from the center of the circle is
(A) constant in direction only.
(B) is constant in magnitude only.
(C) is constant both in direction and magnitude.
(D) is constant neither in magnitude nor in direction.
Option b – is constant in magnitude only.
A steel wire of 30 cm is divided into 5 equal sections and bent in the shape of a stapler pin with its horizontal side thrice of its vertical side. If upon magnetizing, it has a pole strength of 0.2 Am then, the associated magnetic moment is
(A) 0.024 Am²
(B) 0.2 Am²
(C) 0.036 Am²
(D) 0.36 Am²
Option c – 0.036 Am²
A constant current flows along the length of an infinitely long, straight, thin-walled pipe then,
(A) the magnetic field at any point inside the pipe is zero.
(B) the magnetic field is zero only on the axis of the pipe.
(C) the magnetic field at all points inside the pipe is the same, but not zero.
(D) the magnetic field is different at different points inside the pipe.
Option a – the magnetic field at any point inside the pipe is zero.
In a shunted galvanometer if only 10% current passes through the galvanometer then the ratio of the potential drop across the galvanometer to the potential drop across the shunt is
(A) 1 : 9
(B) 1:10
(C) 1 : 1
(D) 9 : 1
Option c – 1 : 1
When a short bar magnet is placed with its north pole pointing south, the neutral point is found to be 12 cm away from the center of the magnet. If a horizontal component of the earth’s magnetic field is 0.4 gauss, then a magnetic moment of the magnet is
(A) 0.34 Am²
(B) 0.69 Am²
(C) 0.81 Am²
(D) 0.47 Am²
Option a – 0.34 Am²
Which of the following serves as a unit of atomic magnetic dipole moment?
(A) Bohr magneton.
(B) Gyromagnetic ratio.
(C) Relative permeability.
(D) Oersted.
Option a – Bohr magneton.
For a charged particle moving through a magnetic field at right angles to the field, after 4 seconds, its kinetic energy and magnitude of momentum
(A) change.
(B) remain constant.
(C) respectively changes and remain constant.
(D) respectively remains constant and changes.
Option b – remain constant
When a graph of stopping potential versus frequency is plotted,
(A) its X-intercept is negative and gives the magnitude of threshold frequency.
(B) its Y-intercept is positive giving minimum stopping potential.
(C) its X-intercept is positive and has no Y-intercept.
(D) its negative Y-intercept gives the value of work function/e.
Option d – its negative Y-intercept gives the value of work function/e.
Out of the following which option/s can be used to produce a propagating em wave and which to produce a de Broglie wave? (i) A stationary a-particle. (ii) A neutron in motion. (iii) A neutron with constant acceleration. (iv) An electron with constant velocity.
(A) (ii), (iii) and (iv) for de Broglie wave.
(B) (iii), (iv) for EM waves, and de (ii), for Broglie waves.
(C) (ii), (iii), (iv) for EM waves, and all for de Broglie wave.
(D) (ii), (iii), and (iv) for de Broglie’s wave and (iii) for EM wave.
Option a – (ii), (iii) and (iv) for de Broglie wave.
Choose an incorrect statement.
(A) A shunt is used to protect the galvanometer from high currents.
(B) A shunt is used for converting a galvanometer into an ammeter.
(C) A shunt is connected in parallel in the circuit.
(D) A shunt may be used for decreasing the range of the ammeter.
Option d – A shunt may be used for decreasing the range of the ammeter.
If magnetic field lines exist inside a material, the material must be ………..
(A) magnetized
(B) diamagnetic
(C) paramagnetic
(D) ferromagnetic
Option a – magnetized
Bar magnet, magnetic compass, and current carrying loop, all of these (i) produce a uniform magnetic field. (ii) form magnetic dipoles.
(A) Only (i) is correct.
(B) Only (ii) is correct.
(C) Both (i) and (ii) are correct.
(D) Neither (i) nor (ii) are correct.
Option b – Only (ii) is correct.
Assertion: The sensitivity of MCG is increased by placing a suitable magnetic material as a core inside a coil. Reason: Using an iron core increases the value of current.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option c – The assertion is True, Reason is False.
In cyclotrons, as the velocity of charged particle increases, the magnetic field is
(A) increased to maintain the frequency of rotation of the particle constant.
(B) decreased to maintain the frequency of rotation of the particle constant.
(C) kept constant to maintain the frequency of rotation of the particle constant.
(D) kept constant and has no effect on the frequency of rotation of particles.
Option a – increased to maintain the frequency of rotation of the particle constant.
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