Q. The capacity of a acid battery is adversely affected by increases in-
Ans. Discharge rate
Q. Electrolyte used in Edison cell is-
Ans. KOH
Q. During charging and discharging of an Edison cell-
Ans. Electrolyte does not take part in chemical reaction
Q. Electrolyte used in nickel-cadmium cell is-
Ans. KOH
Railway Exam Ki Taiyari in Hindi
Q. Nickel-cadmium accumulators in comparison to nickel-iron accumulators have the advantages of-
Ans. Being lighter in weight and cheaper in cost
Q. A floating battery is one-
Ans. Which supplies current intermittently and also during idle period gets changed
Q. Two charges of equal magnitude are separated by some distance. If the changes are increased by 10%; to get same force between them their separation must be-
Ans. Increased by 10%
Q. The phenomenon of an uncharged body getting charged merely by nearness of a charged body is called-
Ans. Induction
Q. When an uncharged body is placed near a charged body then uncharged body-
Ans. Gets charged by induction and then attracted towards the charging body
Q. The value of electric field intensity within the field due to a point charge can be determined by-
Ans. Coulomb’s law
Q. Space surrounding a charge within which the influence of its charge extends is called-
Ans. Electric field
Q. A region around a stationary electric charge has-
Ans. Electric field
Q. On placing a dielectric in an electric field the strength-
Ans. Decreases
Q. Inside a hollow conducting sphere electric field-
Ans. Is zero
Q. Electric field inside a hollow metallic charged sphere is-
Ans. Zero
Q. Electric field inside a perfectly conducting media is-
Ans. Zero
Q. The electro magnet is the mode of-
Ans. Soft iron core
Q. Dielectric strength of a medium-
Ans. Decreases with the increases in thickness
Q. A medium behaves like dielectric when the-
Ans. Displacement current is much greater than the conduction current
Q. The electric-magnet is made of-
Ans. Soft iron core, steel core
Q. Two electronic moving parallel to each other at the same velocity will-
Ans. Attract each other if they move in the same direction
Q. A capacitor consists of two-
Ans. Conductors separated by an insulator called the dielectric
Q. The total excess or deficiency of electrons in a body is called the-
Ans. Charge
Q. The charge of an isolated conductor resides-
Ans. At the conductor surface
Q. When a charge is given to a conductor-
Ans. It distributes uniformly all over the surface
Q. Joule/Coulomb is the unit of-
Ans. Charge
Q. Internal heating of a capacitor is usually attributed to-
Ans. Leakage resistance
Q. Capacitance of a parallel plate capacitor is not affected by-
Ans. Thickness of plants
Q. Which of the following statements associated with inductor is wrong?
Ans. An inductor is a sort of open circuit to dc.
Q. The kind of magnet that is made by wrapping a coil of fine wire around a steel bar is called-
Ans. Permanent magnet
Q. The magnetic field strength of an air-cored coil can be increased by-
Ans. Increasing the number of turn on the coil
Q. In a cable capacitor voltage gradient is maximum at the surface of the-
Ans. Earth
Q. While testing a capacitor with ohmmeter, if the capacitor shows charging but the final resistance reading is appreciably less than normal the capacitor is-
Ans. Leaky
Q. If an ohmmeter reading immediately goes practically to zero and stays there while checking a capacitor the capacitor is-
Ans. Short-circuited
Q. A permeable substance is one-
Ans. Through which the magnetic lines of force can pass very easily
Q. Permanent magnetism is one which-
Ans. Is left in the iron piece after the removal if the magnetic field
Q. The direction of magnetic lines of force is from-
Ans. North pole to south pole
Q. When a piece of iron is placed in a magnetic field-
Ans. The magnetic lines of force will bend away from their usual paths so as to pass through the piece
Q. Force experienced by a unit north pole at any point is called-
Ans. Magnetic flux strength
Q. Lines of force-
Ans. Never intersect
Q. Tubes of force within the magnetic material are called-
Ans. Tubes of induction
Q. The number of lines of force per unit area is measure of-
Ans. Magnetic flux density
Q. Magnetic flux density emerging out of a closed surface is-
Ans. Zero
Q. Ratio of intensity of magnetization to the magnetizing force or intensity of magnetic field is called the-
Ans. Susceptibility
Q. The unit of susceptibility is-
Ans. H/m.
Q. For vacuum susceptibility is-
Ans. Zero
Q. The polarity of the pole can be determined by-
Ans. End rule
Q. The magnitude of force acting on a current carrying conductor placed in a magnetic field is independence of-
Ans. Cross-sectional area of conductor
Q. In Fleming’s left hand rule thumb always represents direction of-
Ans. Current flow
Q. If a current carrying conductor is placed in a magnetic field the mechanical force experienced on the conductor is determined by-
Ans. Dot product
Q. The magnetic field intensity (in A/m) at the center of a circuit coil of diameter 1 m and carrying a current of 2A is-
Ans. Parallel to the axis.
Q. The magnetic flux inside the exciting coil-
Ans. Is the same as on its outer surface
Q. It the two conductor carry current in opposite directions there will be-
Ans. A force of repulsion between the two conductor
Q. Mmf o magnetic circuit is analogous to-
Ans. Emf
Q. Unit of mmf is-
Ans. Permanence
Q. An air gap is usually inserted in magnetic circuit to-
Ans. Prevent saturation
Q. The ratio of total flux (flux in the iron path) to useful flux (flux in the air gap) is called-
Ans. Leakage factor
Q. Which law is synonymous with the occurrence of diamagnetism?
Ans. Lenz’s law
Q. The emf induced in a coil due to relative motion of a magnet in independent of-
Ans. Coil resistance
Q. When a single turn coil rotates in a uniform magnetic field, at uniform speed the induced emf will be-
Ans. Alternating
Q. Principle of dynamically induced emf is used in a-
Ans. Generator
Q. The direction of dynamically induced emf in a conductor can be determined by-
Ans. Fleming’s right hand rule.
Q. Principle of statically emf is used in-
Ans. Transformer
Q. Magnitude of statically induced emf depends on the-
Ans. Rate of charge of flux
Q. The property of a coil which a counter emf is induced in it when the current through the coil charges is called-
Ans. Self-inductance
Q. Lower the self-inductance of a coil-
Ans. Smaller the delay in established steady current through it.
Q. An open coil has-
Ans. Infinite resistance and zero induction
Q. When a magnetizing force is removed material the kind of magnetism that remains is called-
Ans. Residual magnetism
Q. Material subjects to rapid reversals of magnetism should have-
Ans. Low permeability and large co-activity.
Q. When an electric current is passed through a bucket full of water lot of building is there. The electric current is-
Ans. Dc
Q. The frequency of an alternating quantity is the number of-
Ans. Cycles completed per minute.
Q. The time period of periodic time T of an alternating quantity is the time taken in seconds to complete-
Ans. One cycle
Q. An ac generator running at 1,000 rpm produces emf of 50Hz. The numbers of poles on the generator is-
Ans. 6
Q. Average value of an unsymmetrical alternating quantity is calculated over the-
Ans. Whole cycle
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