Class 12th

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Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Sharp glass edge becomes smooth on heating it upto its melting point.

Reason R: The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.

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Contributor-Level 10

Both statement are correct for the glass body heating, but reason is not correct explanation during heating process of glass, constituents unit rupture of glass body and gives the edge smoothness.

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All structure can produce -CHO functional group which gives +ve test of Tollen's reagent except structure (II), because if forms ketonic group after tautomerisation

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An inorganic compound 'X' on treatment with concentrated H₂SO₄ produces brown fumes and given dark brown ring with FeSO₄ in presence of concentrated H₂SO₄. Also compound 'X' gives precipitate 'Y', when its solution in dilute HCl is treated with H₂S gas. The precipitate ' Y', on treatment with concentrated HNO₃ followed by excess of NH₄OH further given deep blue coloured solution, Compound 'X' is:

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Contributor-Level 10

$X \to_{H_{2} S O_{4}}^{C o n c}$ Brown fumes + Brown ring test with FeSO₄/H₂SO₄

$x \to_{H C l}^{H_{2} S} Y (p p t) \to_{H N O_{3}}^{C o n c} d i s s o l v e d \to_{N H_{4} O H}^{}$ Deep blue colour solution

In cation analysis of Cu⁺ ions, precipitate formed is CuS on treating with H₂S and HCl which dissolved in HNO₃ and produced blue colour complex solution ${[C u {(N H_{3})}_{4}]}^{+ +}$ in NH₄OH. Brown fumes and brown ring performance given by nitrate sample. Hence salt is Cu (NO₃)₂.

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Class 12th National Fire Service College

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Does National Fire Service College accept Class 12th marks?

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Nitesh Gulati

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Candidates seeking admission to the BTech programme can enrol for admission with Class 12 marks. Candidates must complete Class 12 to enrol for the BTech course. The college offers only one UG course, i.e., BTech. National Fire Service College admissions are based on entrance exam.

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The four sentences (labelled 1, 2, 3 and 4) below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and choose the correct option.

1. His wide experience of men and things is manifest in the life-likeness and mature power of his poetry.

2. Chaucer's personality stands out in his writings plainly and most delightfully.

3. It accounts in part for the broad truth of all but his earliest work, which makes it essentially poetry not of an age but for all time.

4. It must be borne in mind that, like some others of the greatest poets, he was not a poet merely, but also a

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Payal Gupta

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2^nd sentence introduces the subject and gives further information about it in 4^th sentence; the use of pronoun 'it' in 1^st and 3^rd sentence gives further account of the subject.

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Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

1. The company plans to open new stores at a rate of 20 a year going forward, aiming to raise the number of outlets to 200 within two to three years.

2. By contrast, the demand for private-label products may be less price-sensitive since it is available only at a corresponding supermarket chain.

3.So the demand for branded diapers at any particular store may be quite price sensitive.

4.Branded disposable diapers are available at many supermarkets and drug stores.

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Payal Gupta

Contributor-Level 10

As the first sentence talks about how companies are planning to open new stores in the future. While other sentences mainly focus on the sale of diapers in supermarket and their prices.

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Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

1. As noted by the World Federation for Mental Health, the concept of optimum mental health refers not to an absolute or ideal state but to the best possible state insofar as circumstances are alterable.

2. Mental health is regarded as a condition of the individual, relative to the capacities and social-environmental context of that person.

3. Mental hygiene includes all measures taken to promote and to preserve mental health.

4. Mental arithmetic is the invaluable maths skill of do

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Payal Gupta

Contributor-Level 10

All 1, 2 and 3 specifically talk about mental health and well-being. Sentence D deviates from the topic as it is talking about Mental maths which is totally different in context. Hence, 4 is the odd sentence here.

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