Physics-
General
Easy
Question
The graph shown in the adjacent diagram, represents the variation of temperature T of two bodies x and y having same surface area, with time (t) due to emission of radiation. Find the correct relation between emissive power(E) and absorptive power(a) of the two bodies
The correct answer is:
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Two circular disc A and B with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves (R is rate of cooling)
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A block of steel heated to 100
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The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e. λ and λ will be:
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chemistry-General
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The first Lyman transition in the hydrogen spectrum has ΔE =10.2 eV. The same energy change is observed in the second Balmer transition of -
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Which of the following substance will have highest b.p.t.?
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Which of the following has the lowest melting point-
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The electronic structure of four elements a,b,c and d are a=1s2,b =1s2,2s22p2,c =1s22s22p5,d=1s2 2s22p6 The tendency to form electrovalent bond is greatest in-
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Compound of a metal ‘M’ is M2O3. The formula of its nitride will be-
Compound of a metal ‘M’ is M2O3. The formula of its nitride will be-
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The compound formed by which of the following pair of ions will have lowest melting
point:
The compound formed by which of the following pair of ions will have lowest melting
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chemistry-General
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Formula of a metal oxide is MO, formula of its phosphate will be-
Formula of a metal oxide is MO, formula of its phosphate will be-
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In which of the following solvents, KI has highest solubility? The dielectric constant() of each liquid is given in parentheses:
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Which of the molecule is not hypovalent but completes its octet-
Which of the molecule is not hypovalent but completes its octet-
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