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Q14 of 805 Page 194

Choose the incorrect statement

In India, the frequency of AC is 50Hz.


We know that, Time period,


So, T = 1/50 s


In one time-period, AC changes direction two times.


So, AC changes direction every sec.

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12

What is the maximum resistance which can be made using five resistors each of 1/5 Ω?

13

In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?

15

Among the statements given below select the ones that describe the concept of sustainable development

(i) Planned growth with minimum damage to the environment


(ii) Growth irrespective of the extent of damage caused to the environment


(iii) Stopping all developmental work to conserve the environment


(iv) Growth that is acceptable to all the stakeholders

16

Identify the oxidising agent (oxidant) in the following reactions

(a) Pb3O4 + 8HCl → 3PbCl2 + Cl2 + 4H2O


(b) Mg + 2H2O → Mg (OH)2 + H2


(c) CuSO4 + Zn → Cu + ZnSO4


(d) V2O5 + 5Ca → 2V + 5CaO

Questions · 805
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