Which of the following Harappan sites shows all the three phases of the Harappan culture? A) Dholavira and Rakhigarhi B) Dholavira and Chanudaro C) Rojdi and Rangpur D) Rakhigarhi and Chanudaro

Answers 1

Answer:

Hello your answer is option a

Explanation:

Before the Harappan cities were excavated, scholars believed that Indian civilization had begun in the Ganges valley as the Aryan immigrants from Persia and Central Asia settled in the region around 1250 BCE.

But the discovery of these ancient Harappan cities unsettled that belief and moved the timeline back another 1500 years

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In order to increase the resistance of a given wire of uniform cross section to four times its initial value a fraction of its length is stretched uniformly till the full length of the wire becomes 32 times the original length. What is the value of the fraction?

Answer:

Let R,ρ,L and A be the original wire’s resistance, resistivity, length and area of cross-section.

Suppose, a part of wire’s length equal to l1 is stretched uniformly to make the resistance of the new wire 4R. Consequently, the area of cross section of the stretched portion will also change such that the volume of the stretched portion remains unchanged in the process. Therefore, if l1’ and A’ are the length and area of cross section of the stretched out part of the wire, then 

l1’×A’=l1×A…………..(1)

Also, (L−l1)+l1’=1.5L……………..(2)

Now, in the new configuration of the wire, we have,

Resistance due to the unstretched part, Runstretched=ρA(L−l1)

Resistance due to the stretched part, Rstretched=ρA’l1’=ρl1A(l1’)2 (from (1))

By the problem, 4R=Runstretched+Rstretched

which implies

4ρAL=ρA(L−l1)+ρl1A(l

To differentiate between pentan-2-one and pentan-3-one a test is carried out. Which of the following is the correct answer? a.) Pentan-2-one will give silver mirror test b.) Pentan-2-one will give iodoform test c.) Petan-3-one will give iodoform test d.) None of these.

Answer:

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Explanation:

N≡N 946 kJmol−1

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Explanation:

b is the correct option

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