Objective Questions

Questions (1820)

#	Question	Topic	Actions
401	A galvanometer of 50 Ω gives full scale deflection with 2 mA current. To …	PHY 102 Past Questions	View
402	Total potential difference across the combination of three cells becomes maximu…	PHY 102 Past Questions	View
403	An inductor, L = 0.5H, in series with a resistor, R = 250Ω, are connected…	PHY 102 Past Questions	View
404	The flux linking a coil changes from 5.0 x 10^-4 Wb to 2.2 x 10^-…	PHY 102 Past Questions	View
405	The counting rate from a radioactive source is 8000 counts/s at time t=0, and 1…	PHY 102 Past Questions	View
406	Evaluate the wavelength of the photon emitted as an electron falls from the 7th…	PHY 102 Past Questions	View
407	Hydrogen is an element with one proton. It has three different isotopes. Which …	PHY 102 Past Questions	View
408	A galvanometer has spring constant 'k', a magnetic field 'B' and deflection ang…	PHY 102 Past Questions	View
409	Answer saved A transformer assumed to be 100% efficient has 2500 turns at the p…	PHY 102 Past Questions	View
410	Two capacitors of 3μF are joined in parallel across a battery of 15 volts. The …	PHY 102 Past Questions	View
411	Calculate the kinetic energy of an electron moving in a magnetic field of 1.2T …	PHY 102 Past Questions	View
412	A semiconductor has ________ temperature coefficient of resistance.	PHY 102 Past Questions	View
413	A transformer assumed to be 100% efficient has 2500 turns at the primary and 50…	PHY 102 Past Questions	View
414	The force on a charged particle depends on which of the following factors? I…	PHY 102 Past Questions	View
415	The strength of a semiconductor crystal comes from	PHY 102 Past Questions	View
416	The electric field everywhere on the surface of a hollow sphere of radius 6cm i…	PHY 102 Past Questions	View
417	Which of the following is true about p-n junction diode? i. Forward bias cu…	PHY 102 Past Questions	View
418	Three charges q1=1mC, q2=5mC and q3=9mC are arranged on a line with q2 at the m…	PHY 102 Past Questions	View
419	A galvanometer of 50 Ω gives full scale deflection with 2 mA current. To conver…	PHY 102 Past Questions	View
420	What is electromagnetic induction?	Electromagnetic Induction	View
421	According to Faraday's observations, the induced emf is proportional to:	Electromagnetic Induction	View
422	What is the mathematical expression for Faraday's Law of electromagnetic induct…	Electromagnetic Induction	View
423	What is the SI unit of magnetic flux?	Electromagnetic Induction	View
424	What is the relationship between magnetic flux (Φ), magnetic field (B), and are…	Electromagnetic Induction	View
425	How is magnetic flux calculated when the area is not perpendicular to the magne…	Electromagnetic Induction	View
426	A current loop has an area of 0.01 m² in a 2-T B-field perpendicular to the loo…	Electromagnetic Induction	View
427	If a loop of area 50 cm² is placed parallel to a 0.5-T magnetic field (so the n…	Electromagnetic Induction	View
428	A coil of 100 turns experiences a change in flux of 0.05 Wb in 0.01 seconds. Wh…	Electromagnetic Induction	View
429	What does Lenz's Law state?	Electromagnetic Induction	View
430	If the magnetic flux through a loop is increasing to the left, what direction o…	Electromagnetic Induction	View
431	What is the formula for motional emf when a wire of length L moves with velocit…	Electromagnetic Induction	View
432	What is the motional emf for a wire of length 0.3 m moving at 10 m/s perpendicu…	Electromagnetic Induction	View
433	When a wire moves at an angle θ relative to the magnetic field, the motional em…	Electromagnetic Induction	View
434	A 0.2-m wire moves at 5 m/s at 30° to a 0.4-T field. What is the induced emf?	Electromagnetic Induction	View
435	What is the source of the induced emf in a moving conductor?	Electromagnetic Induction	View
436	In a simple AC generator, how is the alternating current produced?	Electromagnetic Induction	View
437	What is the maximum induced emf in an AC generator with N turns, area A, angula…	Electromagnetic Induction	View
438	An AC generator has 10 turns, area 0.1 m², rotates at 314 rad/s in a 0.2-T fiel…	Electromagnetic Induction	View
439	How is a DC generator different from an AC generator?	Electromagnetic Induction	View
440	What is back emf in an electric motor?	Electromagnetic Induction	View
441	In a DC motor, the relationship between applied voltage (V), back emf (ε_b), cu…	Electromagnetic Induction	View
442	A DC motor has armature resistance 2 Ω and draws 5 A at full speed when connect…	Electromagnetic Induction	View
443	Why is the starting current of a DC motor much higher than its operating curren…	Electromagnetic Induction	View
444	What is the function of slip rings in an AC generator?	Electromagnetic Induction	View
445	What is the purpose of a commutator in a DC generator/motor?	Electromagnetic Induction	View
446	In a series-wound DC motor, how are the field and armature windings connected?	Electromagnetic Induction	View
447	In a shunt-wound DC motor, how are the field and armature windings connected?	Electromagnetic Induction	View
448	What happens to the back emf in a motor as the rotational speed increases?	Electromagnetic Induction	View
449	What is the SI unit of magnetic field (flux density)?	Electromagnetic Induction	View
450	What does the negative sign in Faraday's Law (ε = -N ΔΦ/Δt) represent?	Electromagnetic Induction	View
451	A coil of 50 turns with area 0.02 m² is in a uniform B-field of 0.3 T perpendic…	Electromagnetic Induction	View
452	If a wire of length 0.5 m moves at 8 m/s perpendicular to a 0.2-T field, what i…	Electromagnetic Induction	View
453	An AC generator produces a sinusoidal emf. At what angle does the emf become ze…	Electromagnetic Induction	View
454	At what angle does an AC generator produce maximum emf?	Electromagnetic Induction	View
455	What is the angular frequency of a 60-Hz AC generator?	Electromagnetic Induction	View
456	If the number of turns in an AC generator coil is doubled, what happens to the …	Electromagnetic Induction	View
457	If the magnetic field in an AC generator is reduced by half, the maximum emf wi…	Electromagnetic Induction	View
458	What is the relationship between the frequency of rotation and the output frequ…	Electromagnetic Induction	View
459	In a DC generator, the output voltage is not constant but:	Electromagnetic Induction	View
460	Why do commercial motors use many coils of wire around the armature?	Electromagnetic Induction	View
461	A magnetic field of 0.2 T passes through a loop of area 0.05 m² at an angle of …	Electromagnetic Induction	View
462	A wire of length 0.4 m moves at 6 m/s at 90° to a 0.3-T field. What is the indu…	Electromagnetic Induction	View
463	What is the induced emf in a 0.5-m wire moving at 10 m/s at 30° to a 0.4-T fiel…	Electromagnetic Induction	View
464	A 100-turn coil with area 0.01 m² rotates in a 0.2-T field at 50 rad/s. What is…	Electromagnetic Induction	View
465	If a coil of 200 turns has a flux change of 0.02 Wb in 0.05 s, what is the indu…	Electromagnetic Induction	View
466	The plates of a parallel plate air capacitor are charged to 100 V. A 2mm plate …	PHY 102 Past Questions	View
467	An inductor, L = 0.5H, in series with a resistor, R = 250Ω, are connec…	PHY 102 Past Questions	View
468	The flux linking a coil changes from 5.0 x 10^-4 Wb to 2.2 x 10^-…	PHY 102 Past Questions	View
469	The force on a charged particle depends on which of the following factors? …	PHY 102 Past Questions	View
470	Which of the following is not true with respect to semiconductors?	PHY 102 Past Questions	View
471	The electric field everywhere on the surface of a hollow sphere of radius 6cm i…	PHY 102 Past Questions	View
472	Which of the following is true about p-n junction diode? i. Forward bias cur…	PHY 102 Past Questions	View
473	Which of the following is not true about doping of semiconductor?	PHY 102 Past Questions	View
474	Three resistors (2 Ohms, 4 Ohms, 5 Ohms) are connected in parallel with a poten…	PHY 102 Past Questions	View
475	An inductor, L = 0.5H, in series with a resistor, R = 250Ω, are connec…	PHY 102 Past Questions	View
476	Which of the following is true about a p-n junction diode? i. Forward bias…	PHY 102 Past Questions	View
477	The direction of conventional current is:	PHY 102 Past Questions	View
478	Which of the following statements is CORRECT?	PHY 102 Past Questions	View
479	The mass of a charge-bearing oil droplet in Millikan's apparatus is 10^-5	PHY 102 Past Questions	View
480	Three charges q1 = 1mC, q2 = 5mC, and q3 = 9mC are arranged on a line with q2 a…	PHY 102 Past Questions	View
481	A galvanometer of 50 Ω gives full scale deflection with 2 mA current. To…	PHY 102 Past Questions	View
482	A light bulb has an input power consumption of 50 watts. The light bulb was act…	PHY 102 Past Questions	View
483	An inductor, L = 0.5H, in series with a resistor, R = 250Ω, are connecte…	PHY 102 Past Questions	View
484	The force on a charged particle depends on which of the following factors? i…	PHY 102 Past Questions	View
485	A small object carrying a charge of 5 x 10^-9 C experiences a downwar…	PHY 102 Past Questions	View
486	When a battery, a resistor, a switch, and an inductor form a circuit, and the s…	PHY 102 Past Questions	View
487	The power dissipated by a 72 Ω resistor connected to sinusoidal a.c. source is …	PHY 102 Past Questions	View
488	Ohm's law can be used only to a _________ circuit or component	PHY 102 Past Questions	View
489	Which of the following is true about intrinsic semiconductor? i. Each semic…	PHY 102 Past Questions	View
490	An alternating voltage whose peak value is 80 volts is connected across a 60 oh…	PHY 102 Past Questions	View
491	_________ is used for measuring potential difference.	PHY 102 Past Questions	View
492	The constant k, which appears in Coulomb's law formula, is equivalent dimension…	PHY 102 Past Questions	View
493	Magnetic lines of force have all but one of the following characteristics. The …	PHY 102 Past Questions	View
494	In intrinsic semiconductors at room temperature, the number of electrons and ho…	PHY 102 Past Questions	View
495	Calculate the total resistance between the points A and B as shown in the circu…	PHY 102 Past Questions	View
496	Ohm's law can be used only to a ________ circuit or component.	PHY 102 Past Questions	View
497	Which of the following is true about intrinsic semiconductor? i. Each semi…	PHY 102 Past Questions	View
498	An alternating voltage whose peak value is 80 volts is connected across a 60 oh…	PHY 102 Past Questions	View
499	___________ is used for measuring potential difference.	PHY 102 Past Questions	View
500	The battery connection required to forward bias PN junction are	PHY 102 Past Questions	View

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