Chapter 4: Problem 21
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Chapter 4: Problem 21
These are the key concepts you need to understand to accurately answer the question.
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The value of \(\lim _{\mathrm{x} \rightarrow 0} \frac{1}{\mathrm{x}^{3}} \int_{0}^{\mathrm{x}} \frac{\mathrm{t} \ell n(1+\mathrm{t})}{\mathrm{t}^{4}+4} \mathrm{dt}\) is A) 0 B) \(\frac{1}{12}\) C) \(\frac{1}{24}\) D) \(\frac{1}{64}\)
The focal length of a thin biconvex lens is \(20 \mathrm{~cm}\). When an object is moved from a distance of \(25 \mathrm{~cm}\) in front of it to \(50 \mathrm{~cm}\), the magnification of its image changes from \(\mathrm{m}_{25}\) to \(\mathrm{m}_{50}\). The ratio \(\frac{\mathrm{m}_{25}}{\mathrm{~m}_{\mathrm{so}}}\) is
Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is \(\mathrm{KCN} \quad \mathrm{K}_{2} \mathrm{SO}_{4} \quad\left(\mathrm{NH}_{4}\right)_{2} \mathrm{C}_{2} \mathrm{O}_{4} \quad \mathrm{NaCl} \quad \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}\) \(\mathrm{FeCl}_{3} \quad \mathrm{~K}_{2} \mathrm{CO}_{3}\) 0 \(\mathrm{NH}_{4} \mathrm{NO}_{3} \quad \mathrm{LiCN}\)
Aqueous solutions of \(\mathrm{HNO}_{3}, \mathrm{KOH}, \mathrm{CH}_{3} \mathrm{COOH}\), and \(\mathrm{CH}_{3}\) COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are) A) \(\mathrm{HNO}_{3}\) and \(\mathrm{CH}_{3} \mathrm{COOH}\) B) \(\mathrm{KOH}\) and \(\mathrm{CH}_{3} \mathrm{COONa}\) C) \(\mathrm{HNO}_{3}\) and \(\mathrm{CH}_{3} \mathrm{COONa}\) D) \(\mathrm{CH}_{3} \mathrm{COOH}\) and \(\mathrm{CH}_{3} \mathrm{COONa}\)
Let \(p\) and \(q\) be real numbers such that \(p \neq 0, p^{3} \neq q\) and \(p^{3} \neq-q .\) If \(\alpha\) and \(\beta\) are nonzero complex numbers satisfying \(\alpha+\beta=-\mathrm{p}\) and \(\alpha^{3}+\beta^{3}=\mathrm{q}\), then a quadratic equation having \(\frac{\alpha}{\beta}\) and \(\frac{\beta}{\alpha}\) as its roots is A) \(\left(p^{3}+q\right) x^{2}-\left(p^{3}+2 q\right) x+\left(p^{3}+q\right)=0\) B) \(\left(p^{3}+q\right) x^{2}-\left(p^{3}-2 q\right) x+\left(p^{3}+q\right)=0\) C) \(\left(p^{3}-q\right) x^{2}-\left(5 p^{3}-2 q\right) x+\left(p^{3}-q\right)=0\) D) \(\left(p^{3}-q\right) x^{2}-\left(5 p^{3}+2 q\right) x+\left(p^{3}-q\right)=0\)
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