…………. conducts electricity better than copper
A) Graphite
B) Graphene
C) Nano tubes
D) Buckminster fullerene
1 Answers
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Calculate the electric field in a copper wire of cross-sectional area `2.0 mm^(2)` carrying a current of 1 A. The resistivity of copper `=1.7xx10^(-8)
Correct Answer - `0.85xx10^(-2) Vm^(-1)`
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Given that resistivity of copper is `1.68xx10^(-8) Omega`m. Calculate the amount of copper required to draw a wire 10 km long having resistance of `10
Correct Answer - `1492.2 kg`
2 Answers 1 views
Find the time of relaxation between collsion and free path of electrons in copper at room temperature. Given resistivity of copper`=1.7xx10^(-8) Omega
Correct Answer - `2.5xx10^(-14)s, 4.0xx10^(-8) m`
2 Answers 1 views
Shakespeare is acknowledged as the greatest writer because he understood human nature better than anyone else.
Many authors have tried to potray love as human nature, however, none could display it better than Shakespeare does in his plays. In this play – ‘A Midsummer Night’s Dream’ he...
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_________is the purposeful mainpulation of plant species in order to create desired plant types that are better suited for cultivation, giving better
Correct Answer - Plant breeding
2 Answers 1 views
Himachal Pradesh has low mortality rate on account of i) better health facilities. ii) better educational facilities
Correct option is C) i and ii only
2 Answers 1 views
Who scored better rank than India in HDI in 2013?
Correct option is B) Srilanka
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………………. is the better indicator of growth and development than GDP.
A) Human Development Index
2 Answers 1 views
Reflection of sound will be better on …………. surface than ………….. surface.
B) rough, smooth
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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.
(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...
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