# Physics [Electricity & Magnetism] Questions for Railway ALP Stage-II Exam : 5th December 2018

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Q1. A bird sitting on a high tension electric wire does not get electrocuted, because
рдПрдХ рд╣рд╛рдИрдЯреЗрдВрд╢рди рдмрд┐рдЬрд▓реА рдХреЗ рддрд╛рд░ рдкрд░ рдмреИрдареЗ рдкрдХреНрд╖реА рдХреЛ рдХрд░рдВрдЯ рдирд╣реАрдВ рд▓рдЧрддрд╛ рд╣реИ, рдХреНрдпреЛрдВрдХрд┐
(a) it has high resistance/ рдпрд╣ рдЙрдЪреНрдЪ рдкреНрд░рддрд┐рд░реЛрдз рд╣реИ
(b) the body is earthed /рд╢рд░реАрд░ рднреВрд╕рдореНрдкрд░реНрдХрд┐рдд рд╣реИ
(c) there feet are not good conductors of electricity / рдЙрдирдХреЗ рдкреИрд░ рдмрд┐рдЬрд▓реА рдХреЗ рд╕реБрдЪрд╛рд▓рдХ рдирд╣реАрдВ рд╣реИрдВ
(d) its feet are good insulators / рдЙрдирдХреЗ рдкреИрд░ рдКрд╖реНрдорд╛рд░реЛрдзреА рд╣реИрдВ
Ans.(c)
Sol. Electricity flows along the path of least resistance. Birds don’t get shocked when they sit on electrical wires because they are not good conductors of electricity. Their cells and tissues do not offer electrons an easier route than the copper wire they’re already traveling along.

Q2. Which of the following is arranged in order of decreasing conductivity?
рдирд┐рдореНрдирд▓рд┐рдЦрд┐рдд рдореЗрдВ рд╕реЗ рдХреМрди рд╕рд╛ рдШрдЯрддреА рдЪрд╛рд▓рдХрддрд╛ рдХреЗ рдХреНрд░рдо рдореЗрдВ рд╡реНрдпрд╡рд╕реНрдерд┐рдд рдХрд┐рдпрд╛ рдЧрдпрд╛ рд╣реИ?
(a) Copper, aluminium, steel, silver/ рдХреЙрдкрд░, рдПрд▓реНрдпреВрдореАрдирд┐рдпрдо, рд╕реНрдЯреАрд▓, рдЪрд╛рдВрджреА
(b) Aluminium, silver, copper, steel/ рдПрд▓реНрдпреВрдореАрдирд┐рдпрдо, рдЪрд╛рдВрджреА, рдХреЙрдкрд░, рд╕реНрдЯреАрд▓
(c) Copper, silver, aluminium, steel/ рдХреЙрдкрд░, рдЪрд╛рдВрджреА, рдПрд▓реНрдпреВрдореАрдирд┐рдпрдо, рд╕реНрдЯреАрд▓
(d) Silver, copper, aluminium, steel/ рдЪрд╛рдВрджреА, рдХреЙрдкрд░, рдПрд▓реНрдпреВрдореАрдирд┐рдпрдо, рд╕реНрдЯреАрд▓

Ans.(d)
Sol. Silver is more conductivity then copper, copper is more conductivity then aluminium and  aluminium is more conductivity then steel.

Q3. If a copper wire is increased to double its length, its resistance will become
рдпрджрд┐ рддрд╛рдВрдмреЗ рдХреЗ рддрд╛рд░ рдХреА рд▓рдВрдмрд╛рдИ рдЙрд╕рдХреА рджреЛ рдЧреБрдиреА рдХрд░ рджреА рдЬрд╛рддреА рд╣реИ, рддреЛ рдЗрд╕рдХрд╛ рдкреНрд░рддрд┐рд░реЛрдз рдХреНрдпрд╛ рд╣реЛрдЧрд╛?
(a) four times/рдЪрд╛рд░ рдЧреБрдирд╛
(b) one-fourth/рдПрдХ рдЪреМрдерд╛рдИ
(c) double/рджреЛ рдЧреБрдирд╛
(d) half/рдЖрдзрд╛

Ans.(c)
Sol. As a wire gets longer its resistance increases, and as it gets thinner its resistance also increases because its cross sectional area decreases. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length.

Q4. Superconductor is the conductor whose____________is zero
рдЕрддрд┐рдЪрд╛рд▓рдХрддрд╛ рд╡рд╣ рдХрдВрдбрдХреНрдЯрд░ рд╣реИ рдЬрд┐рд╕рдХрд╛____________ рд╢реВрдиреНрдп рд╣реИ
(a) potential/ рдХреНрд╖рдорддрд╛
(b) current /рдХрд░рдВрдЯ
(c) resistance / рдкреНрд░рддрд┐рд░реЛрдз
(d) inductance/ рдЕрдзрд┐рд╖реНрдард╛рдкрди

Ans.(c)
Sol. At zero resistance, the material conducts current perfectly. This is incomprehensible because the flaws and vibrations of the atoms should cause resistance in the material when the electrons flow through it.In a superconductor, the electric resistance is equal to zero.

Q5. After long periods of use, a grey spot develops on the inside of a bulb. This is because
рд▓рдВрдмреА рдЕрд╡рдзрд┐ рдХреЗ рдЙрдкрдпреЛрдЧ рдХреЗ рдмрд╛рдж, рдмрд▓реНрдм рдХреЗ рдЕрдВрджрд░ рдПрдХ рдЧреНрд░реЗ рд░рдВрдЧ рдХрд╛ рдзрдмреНрдмрд╛ рдмрди рдЬрд╛рддрд╛ рд╣реИ. рдпрд╣ рдЗрд╕рд▓рд┐рдП рд╣реЛрддрд╛ рд╣реИ рдХреНрдпреЛрдВрдХрд┐
(a) the tungsten filament evaporates and collects/ рдЯрдВрдЧрд╕реНрдЯрди рдлрд┐рд▓рд╛рдореЗрдВрдЯ рд╡рд╛рд╖реНрдкрд┐рдд рд╣реЛрддрд╛ рд╣реИ рдФрд░ рдПрдХрддреНрд░рд┐рдд рд╣реЛ рдЬрд╛рддрд╛ рд╣реИ
(b) the heat of the bulb scorches the glass at the top/ рдмрд▓реНрдм рдХреА рдЧрд░реНрдореА рд╢реАрд░реНрд╖ рдкрд░ рдЧрд┐рд▓рд╛рд╕ рдХреЛ рдЬрд▓рд╛ рджреЗрддреА рд╣реИ
(c) dust inside the bulb condenses on the top/ рдмрд▓реНрдм рдХреЗ рдЕрдВрджрд░ рдзреВрд▓ рд╢реАрд░реНрд╖ рдкрд░ рдЬрдорд╛ рд╣реЛ рдЬрд╛рддреА рд╣реИ
(d) glass undergoes a change due to the heat/ рдКрд╖реНрдорд╛ рдХреЗ рдХрд╛рд░рдг рдЧреНрд▓рд╛рд╕ рдореЗрдВ рдмрджрд▓рд╛рд╡ рдЖрддрд╛ рд╣реИ

Ans.(a)
Sol. After long periods of use, a grey spot develops on the inside of a bulb. This is because  the tungsten filament evaporates and collects.

Q6. Indicate the false statement about the resistance of a wire
рддрд╛рд░ рдХреЗ рдкреНрд░рддрд┐рд░реЛрдз рдХреЗ рдмрд╛рд░реЗ рдореЗрдВ рдЗрдирдореЗрдВ рд╕реЗ рдХреМрди рд╕рд╛ рдХрдерди рдЧрд▓рдд рд╣реИ?
(a) It depend on material of wire/ рдпрд╣ рддрд╛рд░ рдХреЗ рд╕рд╛рдордЧреНрд░реА рдкрд░ рдирд┐рд░реНрднрд░ рдХрд░рддрд╛ рд╣реИ
(b) It is unrectly proportional to the length of wire/ рдпрд╣ рд╕реНрд╡рддрдВрддреНрд░ рд░реВрдк рд╕реЗ рддрд╛рд░ рдХреА рд▓рдВрдмрд╛рдИ рдХреЗ рд╕рд╛рде рдЖрдиреБрдкрд╛рддрд┐рдХ рд╣реИ
(c) It is directly proportional to the area of cross-section of wire/ рдпрд╣ рддрд╛рд░ рдХреЗ рдХреНрд░реЙрд╕-рд╕реЗрдХреНрд╢рди рдХреЗ рдХреНрд╖реЗрддреНрд░рдлрд▓ рд╕реЗ рд╕реАрдзреЗ рдЖрдиреБрдкрд╛рддрд┐рдХ рд╣реИ
(d) Resistance of metallic wire increases with increase in temperature / рддрд╛рдкрдорд╛рди рдореЗрдВ рд╡реГрджреНрдзрд┐ рдХреЗ рд╕рд╛рде рдзрд╛рддреБ рдХреЗ рддрд╛рд░ рдХрд╛ рдкреНрд░рддрд┐рд░реЛрдз рдмрдврд╝рддрд╛ рд╣реИ

Ans.(c)
Sol. Resistance of a wire is inversely proportional to the area of cross-section of wire.

Q7. For which of the following substances, the resistance decreases with increase in temperature?
рдирд┐рдореНрдирд▓рд┐рдЦрд┐рдд рдкрджрд╛рд░реНрдереЛрдВ рдореЗрдВ рд╕реЗ рдХрд┐рд╕рдХреЗ рддрд╛рдкрдорд╛рди рдореЗрдВ рд╡реГрджреНрдзрд┐ рдХреЗ рд╕рд╛рде рдкреНрд░рддрд┐рд░реЛрдз рдХрдо рд╣реЛ рдЬрд╛рддрд╛ рд╣реИ?
(a) Pure silicon/ рд╢реБрджреНрдз рд╕рд┐рд▓рд┐рдХреЙрди
(b) Copper/ рддрд╛рдВрдмрд╛
(c) Nichrome/ рдирд┐рдХреНрд░реЛрдо
(d) Platinum/ рдкреНрд▓реИрдЯрд┐рдирдо
Ans.(a)
Sol. Pure silicon resistance decreases with increase in temperature.

Q8. A transformer works on the principle of
рдПрдХ рдЯреНрд░рд╛рдВрд╕рдлрд╛рд░реНрдорд░ рдХрд┐рд╕ рд╕рд┐рджреНрдзрд╛рдВрдд рдкрд░ рдХрд╛рд░реНрдп рдХрд░рддрд╛ рд╣реИ?
(a) self induction/ рд╕реНрд╡рдд: рдкреНрд░реЗрд░рдг
(b) mutual induction/ рдЖрдкрд╕реА рдкреНрд░реЗрд░рдг
(c) generator /рдЬрдирд░реЗрдЯрд░
(d) inverter/рдЗрдиреНрд╡рд░реНрдЯрд░
Ans.(b)
Sol. A transformer consists of two electrically isolated coils and operates on Faraday’s principal of тАЬmutual inductionтАЭ, in which an EMF is induced in the transformers secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.

Q9. In AC circuits, AC meters measure
AC рд╕рд░реНрдХрд┐рдЯ рдореЗрдВ, AC рдореАрдЯрд░ рдХреНрдпрд╛ рдорд╛рдкрддрд╛ рд╣реИ?
(a) mean values/ рдФрд╕рдд рдЖрдВрдХрдбрд╝реЗ
(b) rms values/ рдЖрд░рдПрдордПрд╕ рдорд╛рди
(c) peak values/ рдкреАрдХ рдорд╛рди
(d) mean square values/ рдорд╛рдзреНрдп рд╡рд░реНрдЧ рдорд╛рди
Ans.(b)
Sol. In AC circuits, AC meters measure rms values.

Q10. Magnetism in materials is due to
рдХрд┐рд╕реА рд╕рд╛рдордЧреНрд░реА рдореЗрдВ рдЪреБрдВрдмрдХрддреНрд╡ рдХрд┐рд╕рдХреЗ рдХрд╛рд░рдг рд╣реИ
(a) electrons at rest/ рдЗрд▓реЗрдХреНрдЯреНрд░реЙрди рдХреА рд╕реНрдерд┐рд░рддрд╛
(b) circular motion of electrons/ рдЗрд▓реЗрдХреНрдЯреНрд░реЙрди рдХреА рдШреВрд░реНрдирди рдЧрддрд┐
(c) protons at rest/ рдкреНрд░реЛрдЯреЙрди рдХреА рд╕реНрдерд┐рд░рддрд╛
(d) all neutrons at rest/ рд╕рднреА рдиреНрдпреВрдЯреНрд░реЙрди рдХреА рд╕реНрдерд┐рд░рддрд╛
Ans.(b)
Sol. Magnetism in materials is due to circular motion of electrons .

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