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Physics NEET MCQ
Thermal And Chemical Effects Of Current Mcq
Quiz 7
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Q.1
Ratio of the amount of heat developed in the four arms of a balanced wheat stone bridge, when the arms have resistance P=100Ω, Q=10Ω, R=300 Ω and S=30 Ω respectively is
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a) 3:30:1:10
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b) 30:3:10:1
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c)30:10:1:3
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d)30:1:3:10
Explanation
From diagram current through P and Q=V (110) Current through R and S - V/(330) Now heat=I2R t By taking ratio HP : HQ : HR : HS= 100/ (110)2 : 10 / (110)2 : 300/ (330)2 : 30 /(330)2 30:3:10:1 Answer:(b)
Q.2
Twenty one similar electric bulbs, each of resistance r are connected in series across 220 V supply. After one bulb is fused, the remaining bulbs are connected again in series cross the same supply. The percentage total change in illumination of bulbs is
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a) decrease by 5%
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b) increase by 5%
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c) decrease by 10%
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d) increase by 10%
Explanation
Answer: (b)
Q.3
The current capacity of a storage cell is 3 Ah. The maximum current it can supply for half hour is
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a)1.5 A
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b) 3 A
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c)4.5 A
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d)6.0 A
Explanation
Answer: (d)
Q.4
The current capacity of the charged secondary cell does not depend on
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a) rate of discharge
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b) temperature
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c)amount of active material
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d)rate of charging
Explanation
Answer: (d)
Q.5
The amount of ions liberated by 96500C charge passed through the electrolyte is called
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a) electrochemical equivalent
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b) chemical equivalent
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c)gram equivalent
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d)none of the above
Explanation
Answer:(c)
Q.6
Which of the following acts as depolariser in Leclanche cell?
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a) MnO2
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b) NH4Cl
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c) Mn2O3
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d) ZnCl2
Explanation
Answer: (a)
0 h : 0 m : 1 s
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