# Multiple Choice Question (MCQ) of Battery page-9

81. In a lithium cell the positive electrode is made of

A) zinc dust
B) stainless steel
C) spongy iron
D) carbon.

Ans : (D)

82. The output voltage of a silver oxide cell is

A) 1.1 volt
B) 1.2 volt
C) 1.5 volt
D) 1.71 volt.

Ans : (C)

83. The efficiency of a solar cell can be expected in the range

A) 10 to 15 percent
B) 25 to 35 percent
C) 45 to 60 percent
D) 70 to 85 percent.

Ans : (A)

84. Which of the following material is used in solar cells?

A) Silver
B) Barium
C) Selenium
D) Silicon.

Ans : (D)

85.In the above case the terminal voltage across the second cell will be

A) E (r1 + r2 )
B) E (r1 - r2)
C) E (1 - r1/r2 )
D) E (1 - r2/r1 )

Ans : (D)

86. Two batteries, each having emf E, are connected in series. The combination is connected to an external variable resistor R. If the internal resistance of the batteries is r1 and r2 respectively, then the terminal voltage across the first cell (internal resistance r1 ) will be zero when

A) R = 0
B) R = (r1 + r2 )
C) R = r1 + r2/2
D) R = (r1 - r2 ).

Ans : (D)

87. Two batteries having unequal emf

A) can be connected in series only
B) cannot be connected in series
C) cannot be connected in parallel
D) may be connected in parallel or series.

Ans : (A)

88. If ‘p’ number of cells are connected in series and ‘q’ number of such series combinations are connected in parallel. The entire set is connected through an external resistance R. The internal resistance of individual cell is ‘r’. The assembly will yield maximum current when

A) R = 4
B) R = pr
C) R = q.r/p
D) R = p.r/q

Ans : (D)

89. A graph of terminal voltage of battery as a function of the current drawn from it for various external resistances in the circuit is plotted. Which of the following statements about this graph is valid?

A) The graph will have parabolic shape
B) The graph will pass through the origin
C) The slope of the graph will be equal to the internal resistance of the battery
D) The graph will be straight line parallel to current axis.

Ans : (C)

90. Which of the following is a dry storage cell?

A) Mercury cell
B) Edison cell
C) Carbon-zinc cell

Ans (D)

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