The most desirable combination for the material of a cooking pot is
(A) high specific heat and high conductivity.
(B) low specific heat and high conductivity.
(C) high specific heat and low conductivity.
(D) low specific heat and low conductivity.
1 Answers
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State the names of the hardest material and the softest material.
Hardest material : Diamond Softest material : Aluminium [Note: Material with highest strength is steel whereas material with lowest strength is plasticine clay.]
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Mosses are used as packing material during transport of living material. Give reason.
Mosses are also used as packing material for transport of living materials because they have significant water holding capacity.
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Which techniques of genetic engineering overcome the limitation and allows us to isolate and introduce only one one or a set of desirable genes withou
Correct Answer - Recombinant DNA, gene cloning and gene transfer
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i) Why is cooking difficult at high altitude? ii) Why is cooking faster in pressure cooker?
1. At high altitude density of air is low which causes reduction in atmospheric pressure. As pressure is less, boiling point of water lowers. Water, at high altitude, starts boiling below 100°C. As food...
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The Young’s modulus of a material is 10^11 Nm^-2 and its Poisson’s ratio is 0.2. The modulus of rigidity of the material is
Correct option is: (A) 0.42 × 1011 N/m2
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How much heat is required to raise temperature of 750 g of copper pot from 20 to 50 °C?
Given: s = 0.094 kcal/kg°C, m = 750 g = 0.750kg, T1 = 20°C and T2 = 50°C Rise in temperature, ∆T = T2 – T1 = 50 – 20 = 30°C To find: Heat required (Q) Formula: Q =...
2 Answers 3 views
The refractive index of a material is 1. If the speed of light in vacuum is 3 × 108 ms^-1 then the speed of light in that material is ………………..
B) 3 × 108 m/s
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The way of incorporating desirable characters into crop varieties is by
A) Hybridisation
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The best method for extracting desirable characters in the plants
Answer is (A) i – only
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The frequency of a light wave in a material is 2 x 10^14 Hz and wavelength is 5000 Å. The refractive index of material will be (a) 1.40
Answer is : (c) 3
2 Answers 2 views