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Electrolysis and storage of batteries
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ In lead acid batteries, sedimentation occurs due to overcharging at high rate [other wrong options] [Discuss in forum] idleness foralongeiperiod. overcharging at slow rate. slow charging at low rate. |
Q22 ⇒ The condition of a fully charged lead acid battery cannot be
ascertained by colour of the electrolyte. [other wrong options] [Discuss in forum] gassing. voltage. colour of the electrodes. specific gravity of the electrolyte. |
Q23 ⇒ Five cells are connected in series in a row and then four such rows
are connected in parallel to feed the current to a resistive load of
1.25 ω. Each cell has an emf of 1.5 V with an internal resistance
of 0.2 ω. The current through the load will be 5 A [other wrong options] [Discuss in forum] 3.33 A 23.33 A 1 A |
Q24 ⇒ Pickling is removal of scale, grease etc. from the surface. [other wrong options] [Discuss in forum] protection of surface from rusting. a layer coating for preventing surface deterioration. none of the above. |
Q25 ⇒ During discharging of lead acid cells, the terminal voltage decreases
with the decrease in discharge rate. [other wrong options] [Discuss in forum] temperature. state of charge. none of these. |
Q26 ⇒ In a lead acid battery, excessive formation of lead sulphate occurs
due to all of the above. [other wrong options] [Discuss in forum] idleness of battery for a long time. low level of electrolyte. persistent undercharging. |
Q27 ⇒ The emf of a lead battery both (a) and (b). [other wrong options] [Discuss in forum] increases with the increase in specific gravity of the electrolyte. slightly increases with the increase in temperature. decreases with the increase in temperature. |
Q28 ⇒ A 24 V battery of internal resistance r = 4 ω connected to a
variable resistance R. The rate of heat dissipation in the resistor is
maximum when the current drawn from the battery is I. The current
drawn from the battery will be 1/2 when R is equal to 12 ω [other wrong options] [Discuss in forum] 8 ω 16 ω 20 ω |
Q29 ⇒ Oil and grease can be removed from a surface with the help of any of the above. [other wrong options] [Discuss in forum] soaps. hot alkaline solutions. solvents such as gasoline or carbon tetrachioride. |
Q30 ⇒ In a battery, cover is placed over the elements and sealed at the top
of the battery container. This is done in order to both (a) and (b). [other wrong options] [Discuss in forum] exclude dirt and foreign matter from the electrolyte. reduce evaporation of water from electrolyte. none of the above |
Q31 ⇒ Sulphated cells are indicated by the all of the above. [other wrong options] [Discuss in forum] low specific gravity. low voltage on discharge. low capacity. |
Q32 ⇒ If the specific gravity of the electrolyte in a lead acid cell increases
beyond 1.23 there will be increase in internal resistance. [other wrong options] [Discuss in forum] loss of life. loss of capacity. corrosion of the grids of the plate. |
Q33 ⇒ Cells are connected in parallel in order to increase the current capacity. [other wrong options] [Discuss in forum] life of the cells. efficiency. voltage rating. |
Q34 ⇒ For achieving uniform thickness of deposit on irregular surface anode and cathode are kept farther apart [other wrong options] [Discuss in forum] anode and cathode are kept closer. high current densities are used. electrolyte is agitated constantly |
Q35 ⇒ In a lead acid battery, separators are provided to avoid internal short circuits. [other wrong options] [Discuss in forum] reduce internal resistance. facilitate flow of the current. increase the energy efficiency. |
Q36 ⇒ Short circuiting of a cell may be caused by any of the above. [other wrong options] [Discuss in forum] buckling of plates. breakdown of one or more separators. excessive accumulation of sediments at the bottom of the cell. lead particles forming circuits between positive and negative plates. |
Q37 ⇒ The capacity of a lead acid battery does not depend upon charge rate. [other wrong options] [Discuss in forum] discharge rate. temperature. density of electrolyte & quantity of active material. plate surface area. |
Q38 ⇒ A battery is connected to a resistance causing a current of 0.5 A in
the circuit. The current drops to 0.4 A when an additional resistance
of 5 ω is connected in series. The current will drop to 0.2 A when
the resistance is further increased by 25 ω [other wrong options] [Discuss in forum] 10 ω 15 ω 40 ω |
Q39 ⇒ Rust, scales and oxides can be removed from a surface with the
help of [other wrong options] [Discuss in forum] various acids. alkali and salt solution. mechanical abrasion. electrolytic cleaning any of the above. |
Q40 ⇒ For keeping the lead acid battery terminals free from corrosion it is
advisable to apply petroleum jelly. [other wrong options] [Discuss in forum] keep electrolyte level low charge the battery at frequent intervals. |
Or |