Recent questions tagged sec-c

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?

asked Dec 29, 2016 by suganyadevi.p

1 answer

Give simple chemical tests to distinguish between the following pairs of compounds (i) Propanal and Propanone (ii) Acetophenone and Benzophenone (iii) Phenol and Benzonic acid

asked Dec 29, 2016 by meena.p

1 answer

(i) Halogen acids (HX) readily combine with alkenes to form addition products but fail to react with carbonyl compounds. Explain (ii) Why HCOOH does not give HVZ reaction but $CH_3COOH$ does?

asked Dec 29, 2016 by sharmaaparna1

1 answer

Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.

asked Dec 29, 2016 by sharmaaparna1

1 answer

How will you convert: (i) Ethanoic acid into methanamine (ii) Hexanenitrile into 1-aminopentane (iii) Methanol to ethanoic acid

asked Dec 29, 2016 by sharmaaparna1

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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.

asked Dec 29, 2016 by suganyadevi.p

1 answer

Arrange the following compounds in the increasing order of their boilling points : $CH_3CH_2CH_2CHO,CH_3CH_2CH_2CH_2OH,H_5C_2-O-C_2H_5,CH_3CH_2CH_2CH_2CH_3$

asked Dec 29, 2016 by meena.p

1 answer

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.

asked Dec 29, 2016 by suganyadevi.p

1 answer

(a) What does it mean for a molecule or a ligand to be "chiral"? What properties does chirality impart to a molecule? (b)What is the difference between a heterogeneous and a homogeneous catalyst? What are some of the advantages of homogeneous catalysts?

asked Dec 29, 2016 by sharmaaparna1

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(a) How is granular zinc & zinc dust obtained ? (b) Explain why thermit process is quite useful for repairing the broken parts of a machine ?

asked Dec 29, 2016 by sharmaaparna1

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How do you account for the following ? Hydrazones of aldehydes and ketones are not prepared in a highly acidic medium

asked Dec 29, 2016 by meena.p

1 answer

Consider the electrochemical cell :$Zn (s) / Zn^{2+} (aq) // Cu^{2+} (aq) / Cu.$ It has an electrical potential of 1.1 V when concentration of $Zn^{2+}$ and $Cu^{2+}$ ions is unity.State the direction of flow of electrones and also specify if Zinc and Copper aredeposited or dissolved at their respective electrodes. When :(a) an external opposite potential of 0.8 V is applied.(b) an external opposite potential of 1.1 V is applied.(c) an external opposite potential of 1.4 V is applied.

asked Dec 29, 2016 by sharmaaparna1

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How will you test aldehydes and ketones with (i) Tollens' reagent (ii) Fehiling's solution . Give equation

asked Dec 29, 2016 by meena.p

1 answer

How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at $14^{\circ}F$ ? ($K_f$ for water = $1.86^{\circ}C/mol)$

asked Dec 29, 2016 by sharmaaparna1

1 answer

An ether A $(C_5H_{12}O)$ when heated with excess of hot concentrated $HI$ produced two alkyl halides which on hydrolysis from compounds B and C. Oxidation of B gives an acid D whereas oxidation of C gave a ketone E. Deduce the structures of A, B, C, D and E.

asked Dec 29, 2016 by meena.p

1 answer

Explain the reason behind a colour of some gem stone with the help of example.

asked Dec 28, 2016 by meena.p

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How $t_{2g}$ and eg orbitals are formed in an octahedral complex ?

asked Dec 28, 2016 by meena.p

1 answer

If the points $(1,1,p)$ and $(-3,0,1)$ are at equidistant from the plane $\overrightarrow {r} . (3 \hat {i} +4 \hat {j} -12 \hat {k}) + 13 = 0, $ then find the value of p.

asked Dec 28, 2016 by priyanka.c

1 answer

What are the three basic characteristics of a modern landfill site. List any three and also mention the reasons for their use.

asked Dec 28, 2016 by meena.p

1 answer

What is green house effect? Discuss the impact of green house effect on the environment.People have been actively participating in the efforts for conservation of forests: a.)Name the award instituted in respect of Amritha Devi to promote such efforts. b)Name the movement launched to protect the trees by hugging them.c) Name the step Government of India has undertaken in 1980s to work closely with the local communities for protecting and managing forests

asked Dec 28, 2016 by meena.p

1 answer

Name any two cloning vectors. Mention the features required to facilitate cloning into a vector. What is pBR322.?

asked Dec 28, 2016 by meena.p

1 answer

Observe the a. What does the diagram depict ? b. What is meant by the largest and smallest in this picture? c. Name the compounds used to visualize them.

asked Dec 28, 2016 by meena.p

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Name the scientist who first isolated and characterized the restriction endonuc leases. Name the enzyme and the organism from which they isolated this? What did they discover about the property of the enzyme?

asked Dec 28, 2016 by meena.p

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How are flocs produced in the secondary treatment plant of the sewage? Explain their role.

asked Dec 28, 2016 by meena.p

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Following are the steps of the breeding process. Arrange them in the correct order, name the process and state its advantage. a. The female is mated with a good variety of male. b. The fertilized egg at 8-32 celled stage are recovered and transferred to surrogate mother. c. The female is administered hormones to induce super ovulation.

asked Dec 28, 2016 by meena.p

1 answer

In the given flow diagram, the replication of retrovirus is shown in a host. Examine it.a) Why is this virus called a retrovirus?b) Fill in (1) and (2) c) Can infected cells survive while viruses are being replicated and released by the host cell?

asked Dec 28, 2016 by meena.p

1 answer

Study the given figures (a) and (b) given below and answer the questions from the graph Under the influence of which type of natural selection would graph (a) become like graph (b)?b. What would be the likely reasons for new variations to arise in the population? c. Who suggested natural selection as a mechanism for evolution?

asked Dec 28, 2016 by meena.p

1 answer

Three enzymes are required for the metabolism of lactose. What would happen to this machinery of the operon if mutation occurs in Z gene?

asked Dec 27, 2016 by meena.p

1 answer

A man with a blood group A married a woman with blood group B. They have a son with blood group AB and a daughter with blood group O. Work out the possibility of inheritance with the help of a Punnet square.

asked Dec 27, 2016 by meena.p

1 answer

Give another term for STD. Name two sexually transmitted diseases that are curable and two diseases that are not curable.

asked Dec 27, 2016 by meena.p

1 answer

Form the differential equation of the family of circles in the first quadrant which touch the coordinate axes.

asked Dec 27, 2016 by priyanka.c

1 answer

What is deforestation? Mention some of the causes and also measures taken to prevent deforestation.

asked Dec 27, 2016 by meena.p

1 answer

Represent schematically phosphorus cycle in an ecosystem.

asked Dec 27, 2016 by meena.p

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Nematode specific genes are introduced into the tobacco plants using Agarobacterium vectors to develop resistance in tobacco plants against nematodes. Explain the events that occur in tobacco plants to develop resistance.

asked Dec 27, 2016 by meena.p

1 answer

Explain the responsibility of GEAC set up the Government of India.

asked Dec 27, 2016 by meena.p

1 answer

Read the following base sequence of a certain DNA strand and answer the questions that follow 5’-AAGAATTCAA-3’ 3’-TTCTTAAGTT-5’a. What is a palindromic sequence of DNA? b.Name the palindromic nucleotide sequence shown in the DNA strand and mention the enzyme that will recognize it.5’-AAGAATTCAA-3’ 3’-TTCTTAAGTT-5’ c.State the significance of the enzymes that identify palindromic nucleotide sequence.

asked Dec 27, 2016 by meena.p

1 answer

For what significant properties of Baculoviruses are considered as best biological control agent? Mention its importance in organic farming.

asked Dec 27, 2016 by meena.p

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What is apiculture? What are the requirements to consider bee keeping?

asked Dec 27, 2016 by meena.p

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Differentiate between communicable and non communicable diseases? Name the body part and the host in which the following events take place in the life cycle of Plasmodium

asked Dec 27, 2016 by meena.p

1 answer

Classify the following as examples of homology or analogy.

asked Dec 27, 2016 by meena.p

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Describe the elongation process of transcription in bacteria.

asked Dec 27, 2016 by meena.p

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Why are grasshopper and Drosophila said to show male heterogamety? Explain female heterogamety with an example.

asked Dec 27, 2016 by meena.p

1 answer

The events of a menstrual cycle are represented below. Answer the following:a) State the levels of FSH,LH and progesterone simply by mentioning high or low around 13th or 14th day and 21st and 23rd day. b) In which of the above phase does egg travel to the fallopian tube? c)Why is there no menstruation after fertilization? or Distinguish between gametogenesis and embryogenesis.

asked Dec 26, 2016 by meena.p

2 answers

What is meant by ozone shield? Name two ozone depleting substances. How do ozone depleting substances affect ozone shield?

asked Dec 23, 2016 by meena.p

1 answer

Name and explain the kind of interaction in the following: a)Algae and fungi in the lichens b)Head louse and humans c) Hermit crab and sea anemone.

asked Dec 23, 2016 by meena.p

1 answer

What is bio piracy? Give examples of bio piracy.

asked Dec 23, 2016 by meena.p

1 answer

How are DNA fragments separated and isolated for DNA finger printing? Explain

asked Dec 23, 2016 by meena.p

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Draw a schematic sketch of pBR 322 plasmid and label the following in it a)Any 2 restriction sites b) Ori and rop genes c) An antibiotic resistant gene.

asked Dec 23, 2016 by meena.p

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Give an example and use of the following:a.)Free living fungi: b) Symbiotic fungi: c.)Free living bacteria

asked Dec 23, 2016 by meena.p

1 answer

State the measures you would undertake to improve the quality and quantity of milk production?

asked Dec 23, 2016 by meena.p

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