Recent questions tagged ch7

Two organisms occupying a particular geographical area (say desert) show similar adaptive strategies

asked Jul 7, 2017 by pady_1

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What are the key concepts in the evolutionary theory of Darwin?

asked Jul 7, 2017 by pady_1

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You have studied the story of peppered moths in England. Had industries been removed, what impact co

asked Jul 7, 2017 by pady_1

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<div>How do you express the meaning of words like race, breed, cultivar and a variety?</div><div></d

asked Jul 6, 2017 by pady_1

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State and explain any three factors affecting allele frequency in populations.

asked Jul 6, 2017 by pady_1

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The evolutionary story of moths of England during industrialization reveals that 'evolution is evolu

asked Jul 6, 2017 by pady_1

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While creation and presence of variation is directionless, natural selection is directional as it is

asked Jul 6, 2017 by pady_1

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The scientists believe that evolution is gradual. But extinction, part of evolutionary story are 'su

asked Jul 6, 2017 by pady_1

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Enumerate three most characteristic criteria for designating a Mendelian population.

asked Jul 6, 2017 by pady_1

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Why is nascent oxygen supposed to be toxic to aerobic life forms?

asked Jul 6, 2017 by pady_1

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Louis Pasteur's experiments, if you recall, proved that life could arise from only pre existing life

asked Jul 6, 2017 by pady_1

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Among Ramapithecus, Australopithecines and **** habilis-who probably did not eat meat?

asked Jul 6, 2017 by pady_1

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By what name was the first hominid was knnown?

asked Jul 6, 2017 by pady_1

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Who among the Dryopithecus or Ramapithecus more man like?

asked Jul 6, 2017 by pady_1

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What is founder effect? 

asked Jul 6, 2017 by pady_1

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Among the five factors that are known to affect Hardy - Weinberg equilibrium, three factors are gene

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When we talk of functional macromolecules (proteins, enzymes, hormones, receptors, antibodies etc) t

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How do we compute the age of a rock?

asked Jul 6, 2017 by pady_1

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What is the most important pre-condition for adaptive radiation?

asked Jul 6, 2017 by pady_1

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How do we compute the age of a fossil?

asked Jul 6, 2017 by pady_1

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Give an example of convergent evolution and identify the features towards which they are converging.

asked Jul 6, 2017 by pady_1

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How do we compute the age of a living tree?

asked Jul 6, 2017 by pady_1

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What are we referring to when we say 'simple organisms' or 'complex organism'?

asked Jul 6, 2017 by pady_1

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Did aquatic life forms get fossilized? If yes, where do we get such fossils?

asked Jul 6, 2017 by pady_1

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What were the characteristics of life forms that had been fossilized?

asked Jul 6, 2017 by pady_1

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If $f'(x) = 6x^2+2,$ find $f(x)$, given that $f(x) = 7$ when $x=1$

asked Dec 20, 2016 by priyanka.c

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Integrate : $\begin{align} \int \frac{dx}{3+2 \sin x + \cos x} \end{align}$

asked Dec 12, 2016 by priyanka.c

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$\begin{align} \int_{\frac{\pi}{6}} ^\frac{\pi}{3} \frac{dx}{1+\sqrt{\tan x}} \end{align}$

asked Dec 12, 2016 by priyanka.c

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Find the point on the curve $y = x^3 - 11 x + 5$ at which the target is $y = x -11.$

asked Dec 8, 2016 by priyanka.c

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Evaluate : $\begin{align}\int\limits_{-1}^1 log (\frac{2+x}{2-x}) dx \end{align}$

asked Nov 25, 2016 by priyanka.c

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$\begin{align}\int_0^\frac{\pi}{2} \frac{\sin x}{1 + \cos^2 x } dx \end{align}$

asked Nov 22, 2016 by priyanka.c

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Evaluate : $\begin{align}\int_4^9 \frac{\sqrt x}{(30 - x^{\frac{3}{2}})^2} dx \end{align}$

asked Nov 20, 2016 by priyanka.c

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$\begin{align}\int_0^1 \frac{\tan^{-1} x}{1+x^2} dx \end{align}$

asked Nov 19, 2016 by priyanka.c

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$\begin{align}\int \frac{dx}{\sqrt {x^2 - a^2}} \end{align}$

asked Nov 18, 2016 by priyanka.c

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$\begin{equation} \int\limits_0^1 \sin^{-1} x \; \mathrm{d} x \end{equation}$

asked Nov 17, 2016 by priyanka.c

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$\begin{align}\int \frac{\sin 4x}{ \sin x} dx \end{align}$

asked Nov 13, 2016 by priyanka.c

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A coil has an inductance of $5\;H$ and resistance $20\; \Omega$ . An emf of $100\; v$ is applied to it. What is the energy stored in the magnetic field, when the current has reached its final value .

asked Sep 28, 2016 by meena.p

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What is the peak value of $220\;v\;a.c$

asked Sep 28, 2016 by meena.p

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In a series LCR circuit , the voltage across an inductor, a capacitor and a resistor are $30\;v, 30\;v$ and $60\;v$ respectively . What is the phase difference between the applied voltage and the current in the circuit .

asked Sep 28, 2016 by meena.p

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In an a.c circuit , there is no power consumption in an ideal inductor . why ?

asked Sep 28, 2016 by meena.p

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A resistor of resistance $100 \Omega$ is connected to an ac source. $E= (12 v) \sin (250 \pi s^{-1})t$ Find the energy dissipated as heat during $t=0$ to $t= 1.0\;ms$

asked Sep 28, 2016 by meena.p

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An electric motor operation on a $50\;v$ d.c supply draws a current of $12\;A$ . If the efficiency of the motor is $30\%$ , estimate the resistance of the motor .

asked Sep 28, 2016 by meena.p

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A generator develops am e.m.f of $120\;v$ and has a terminal potential difference of $115\;v$ when the as mature current is $25\;A$ What is the resistance of the as mature ?

asked Sep 28, 2016 by meena.p

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Can a capacitor be used instead of a choke coil in controlling a.c ?

asked Sep 28, 2016 by meena.p

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Why do we prefer a choke coil to a rheostat in controlling a.c ?

asked Sep 27, 2016 by meena.p

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Why are air cored chokes used for reduced high frequency a.c ?

asked Sep 27, 2016 by meena.p

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The calculate the current drawn by the prime of a transformer which steps down $200\;v$ to $20\;v$ to operate a device of resistance $20 \Omega$ the efficiency of the transformer to be $80\%$

asked Sep 27, 2016 by meena.p

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A transformer has an efficiency of $80\%$ and works at 100 volt and 4 kw. If the secondary voltage is $240\;volt$ calculate the primary and secondary currents

asked Sep 27, 2016 by meena.p

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A transformer has 50 turns in the primary and 100 in the secondary . If the primary is connected to a $220\;v$ d.c supply . What will be the voltage across the secondary ?

asked Sep 27, 2016 by meena.p

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A 20 V , 750 Hz source is connected to a series combination of $R= 100\; \Omega, C= 10 \mu F $ and $L= 0.1803\;H$ . Calculate the time in which resistance will get heated by $10^{\circ}$ if thermal capacity of the material $=25 \%$

asked Sep 27, 2016 by meena.p

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