Answers posted by suganyadevi.p

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An aircraft with a wingspan of 40m flies with a speed of 1080 $km hr^{-1}$ in the eastward direction at a constant altitude in the northern hemisphere where the vertical component of earth's magnetic field is $1.75 \times 10^{-5} T$. Find the emf that develops between the tips of the wings.

answered Dec 30, 2016

Given: l = 40m$\upsilon$ = 1080 km/hr = $\frac {1080 \times 100}{3600} = 300 ms^{-1}$B = $1.75 \time...

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A 12v battery connected to a $6 \Omega$, 10H coil through a switch drives a constant current in the circuit. Th switch is suddenly opened. Assuming that it took 1 millisecond to open the switch. Calculate the average e.m.f induced across the coil.

answered Dec 30, 2016

Given: Steady state current I = $\frac {V}{R} = \frac {12}{6} = 2A$When the switch is opened, final ...

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A magnetic field B = $B_{\circ} sin(\omega t)\hat{k}$ covers a large region where a wire AB slides smoothly over two parallel conductors separated by a distance d, as shown in the fig. The wires are in the x - y plane. The wire AB (of length d) has resistance R and the parallel wires have negligible resistance. If AB is moving velocity $\upsilon$, what is the current in the circuit?

answered Dec 29, 2016

Given: Length of the wire AB = dResistance = RVelocity = $\upsilon$Moving along the positive directi...

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There are two coils A and B separated by some distance. If a current of 2A flows through A, a magnetic flex of $10^{-2}$ wb passes through B (no current through B). If no current passes through A and a current of 1A passes through B, what is the flex through A?

answered Dec 29, 2016

From $\phi = MI, M = \frac {\phi}{I} = \frac {10^{-2}}{2}$ henry$\phi = MI = \frac {10^{-2}}{2} \tim...

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A (current vs time) graph of the current passing through a solenoid is shown in the fig. For which time is the back electromotive force (u) a maximum? If the back emf at t = 3s is e, find the emf at t = 40s

answered Dec 29, 2016

e = L $\frac {dI}{dt}$; e will be the maximum when $\frac {dI}{dt}$ = max. From the graph we infer ...

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A (current vs time) graph of the current passing through a solenoid is shown in the fig. For which time is the back electromotive force (u) a maximum? If the back emf at t = 3s is e, find the emf at t = 15s

answered Dec 29, 2016

e = L $\frac {dI}{dt}$ ; e will be maximum when $\frac {dI}{dt}$ = maximum. From the graph we infer ...

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A current vs time graph of the current passing through a solenoid is shown in the fig. For which time in the back electromotive force (u) a maximum? If the back emf at t=3s is e, find the back emf at t = 7s. OA, AB and BC are straight line segments.

answered Dec 29, 2016

e = L $\frac {dI}{dt}$ e will be the maximum when $\frac {dI}{dt}$ = max. From the graph we infer th...

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Find the current in the wine PQ for the configuration as shown in the fig. Wire PQ has negligible resistance. B, the magnetic field is coming out of the paper. $\theta$ is a fixed angle made by PQ travelling smoothly over two conducting parallel wires separated by a distance d.

answered Dec 29, 2016

It is given PQ is a wire of negligible resistance which travels smoothly over two conducting paralle...

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Consider a closed loop C in a magnetic field as shown in the fig. The flex passing through the loop is defined by choosing a surface whose edge coincides with the loop and using the formula $\phi = B_1 . dA_1 + B_2 . dA_2 + ...........$ Now if we choose two different surfaces $S_1$ and $S_2$ having C as their edge, would we get the same answer for flex. Justify.

answered Dec 29, 2016

The answer will be the same for magnetic flex.This is because, magnetic flex is equal to the number ...

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Consider a metallic pipe with an inner radius of 1cm. If a cylindrical bar magnet of radius 0.8 cm is dropped through the pipe, it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metallic pipe. Explain.

answered Dec 29, 2016

When a cylindrical bar magnet is dropped through the metallic pipe, amount of magnetic flex linked w...

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Decarboxylation of an aminoacid results in an____

answered Dec 27, 2016

Ans: C : Aminehttps://clay6.com/mpaimg/s1.jpgWhen an amino acid undergoes decarboxylation, it forms ...

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The genotypic ratio of the Mendel's law can be expressed by

answered Dec 27, 2016

Ans: B: $(ax+by)^2$Based on $\frac {1}{4} : \frac {1}{2} : \frac {1}{4}$ ratio of TT : Tt : tt, it c...

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6-benzylaminopurine (BAP) belongs to which class of plant growth regulators or hormones ?

answered Dec 27, 2016

Ans: ( D ) cytokinin

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A person with AIDS becomes susceptible to infections due to

answered Dec 27, 2016

ans :d.Toxoplasma

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The following is the test-tube contaning DNA from Meeselson and Stahl experiment. Find out what a,b and c could be:

answered Dec 27, 2016

Ans: B : a-$N_{14}-N_{14},b-N_{14}-N_{15}, c-N_{15}-N_{15}$

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if the length of DNA is 1.5 mm, what is the size of the genome of the organism?

answered Dec 27, 2016

Total number of bp $\times$ distance between two consecutive base pairs=length of DNA molecule =$ \f...

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Match the following

answered Dec 27, 2016

Ans: D: 1-d,2-c,3-a,4-b$ I_A i \to A$$ ii \to O $$I_B i \to B$$I_AI_B \to AB$

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The ratio of dwarf:tall plants in the F1 generation is

answered Dec 27, 2016

Ans: B: 0 : 4https://clay6.com/mpaimg/33833.jpg

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which of the photosynthetic reactions use the $NADPH$ and $ATP$ to synthesize carbohydrate from $CO_2$ and $H_2O$ ?

answered Dec 27, 2016

Ans:( A ) dark reaction

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Heterozygous one produces two kinds of gametes each having one allele with equal proportion can be explained by

answered Dec 27, 2016

Ans: D :law of segregation

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The ratio of dwarf:tall plants in the F2 generation is

answered Dec 27, 2016

Ans: B: 1:3https://clay6.com/mpaimg/33834.jpg

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Increase in the amount of ammonia in the blood leads to

answered Dec 27, 2016

Ans: ( D ) hyperammonemiaHyperammonemia is a metabolic disturbance characterised by an excess of am...

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cells in G0 phase are : a. metabolically active b. proliferate under certain circumstances c. metabolically inactive d. do not proliferate e. always are in a state of proliferation

answered Dec 27, 2016

In Go phase, cells are metabolically active and proliferate under certain circumstances depending on...

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Apoptosis or programmed cell death, is executed by a group of proteases called

answered Dec 27, 2016

Ans: ( C ) caspasesCaspases refers to cysteine - aspartic proteases. Cysteine aspartate or cysteine...

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____ is a continuous ongoing process while __ occurs only at specific stages of the cell cycle

answered Dec 27, 2016

Ans: D: mitosis, meiosisMitosis occurs continuously in the somatic cells to replace the old and worn...

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crosssing over is mediated by the enzyme

answered Dec 27, 2016

Ans: C: recombinaseDNA recombinase are widely used in the multicellular organisms to manipulate the ...

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Match the following:

answered Dec 27, 2016

Ans: B: 1-b,2-a,3-d,4-c

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Haem is a ____ in the active site of peroxidases while NAD is a ___

answered Dec 27, 2016

Ans: (C) prosthetic group, coenzymeProsthetic group is a non - protein group forming a part of or co...

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Conversion of glucose into lactic acid is an example of ___pathway

answered Dec 27, 2016

Ans: (D) both a and bBiosynthetic pathways comprises of both catabolic and anabolic pathways. Hence ...

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Disorders like porphyrias occur due to

answered Dec 27, 2016

Ans: ( D ) genetic defects in heme biosynthesisPorphyria refers to a group of disorders that resul...

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One collagen deficiency disease, that occurs due deficiency in lysyl oxidase and results in hypermobile joints and hyperextensibility of the skin is

answered Dec 27, 2016

Ans: ( D ) Ehlers-Danlos syndrome type VEDA are a genetically, biochemically and clinically diverse...

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Non-protein components that are required to make the enzyme active are called

answered Dec 27, 2016

Ans: B: CofactorCo-factor: Non protein constituent part of the enzyme.Prosthetic groups: Are organic...

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The culture of unfertilized ovary that develops into a gynogenic plants refer to

answered Dec 27, 2016

Ans: ( C ) gynogenesisGynogenesis is a special form of sexual reproduction in which insemination is...

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Match the following

answered Dec 27, 2016

Ans: C: 1-b,2-c,3-aDown's syndrome - Trisomy of 21 Klinefelter's syndrome - Additional copy of "x" C...

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___ is also called the adapter molecule

answered Dec 27, 2016

Ans: D: tRNAtRNA is also called an adapter molecule because it attaches itself via initiation and el...

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During translation in prokaryotes, which sequence lies 5' to the AUG initiation codon and is the binding site for the 30S ribosomal subunit ?

answered Dec 27, 2016

Shine Dalgarno sequence is a ribosomal binding site in pro-karyotic mRNA, generally located around 8...

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Which of the following is NOT true? Pachytene is

answered Dec 27, 2016

In pachytene, bivalent chromosomes appear as tetrads. This stage is characterised by the appearance ...

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How is starch different from cellulose

answered Dec 27, 2016

Both starch and glucose are made up of glucose. In starch, glucose units are connected by alpha - li...

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Dorsal plate of cockroach is called

answered Dec 27, 2016

(C) is the right answerTergum is the dorsal plate and sternum is the ventral plate

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Which plant tissue culture technique is used to generate haploid plantlets ?

answered Dec 27, 2016

This technique was discovered in 1964 by Maheshwari and Guha. This technique is used over 200 plant ...

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Which of the following is true about RNAi techonology : a. strategy for gene silencing b. based on complementarity of the nucleotides c.inhibition occurs at the transcription level d. Inhibition occus at translation level e. occurs as a natural defense mechanism in prokaryotes

answered Dec 27, 2016

RNAi takes place in all eukaryotic organisms as a method of cellular defense. This method involves s...

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Graft rejection occurs due to

answered Dec 27, 2016

Graft from any source an animal another primate or any human beings cannot be made since grafts woul...

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The first plasmid used as cloning vector was:

answered Dec 2, 2016

Ans: ( C ) pSC101 by Herbert Boyer and Stanley Cohen, 1973

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Undifferentiated mass of of parenchyma cells derived from plant tissues or explants is called

answered Dec 2, 2016

Ans: (B) Callus

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In micropropagation, the term hardening refers to

answered Dec 2, 2016

Ans: ( A ) Acclamatization (transfer of plant in soil)

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During protoplast isolation, after naked protoplast is released in pectinase, cellulase enzyme mixture, it is fused by which substance that gives low toxicity to the cells ?

answered Dec 2, 2016

Ans: ( D ) poly ethylene glycol (PEG)

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Catalytic RNA molecules that catalyze specific reactions are known as

answered Dec 2, 2016

Ans: ( B ) ribozymes

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The first company to produce recombinant insulin was______

answered Dec 2, 2016

Ans: (C) Eli lilly

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Before a biotechnology product reaches the market, it has to undergo __ after its synthesis

answered Dec 2, 2016

Ans: (D) downstream processingAftr completion of the bio synthetic stage, the product has to be subj...

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DNA fragments are __ charged

answered Dec 2, 2016

Ans: (C) Negatively Charged

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