Doubtly
@Doubtly · Joined Feb 2021
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- Other than thermal power plant, which power plants use thermal energy for power generation? In what different ways is the thermal energy obtained? Nuclear power plants and solar power plants, used thermal energy for power generation other than thermal power plants. Different ways of gen... 1
- Remake the table taking into account relation between entries in three columns. Solution :: I II III Coal Thermal Energy Thermal plant Uranium Nuclear Energy Nuclear power plant Water Reservoir Potential energy Hydro ele... 1
- Which fuel is used in thermal power plant? What are the problems associated with this type of power generation? Coal is used as a fuel in thermal power plant. Coal contains Chemical energy. Upon burning coal releases heat energy. This heat energy is us... 1
- An element has a face-centred cubic (fcc)structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is : Correct Answer is a/2 In FCC, tetrahedral voids are located on the body diagonal at a distance of (a√3/4) from the corner. Together they for... 1
- Which among the following pairs of Vitamins is stored in our body relatively for longer duration ? Correct Option is B) Vitamin A and Vitamin D Explaination : Vitamins which are soluble in fat and oils but insoluble in water are fat-solubl... 1
- In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionisation is 0.3. Correct answe is d ) −0.418 °C 2
- Three complexes, [CoCl(NH3 )5] 2+(l) , [Co(NH3 )5H2O]3+(ll) and [Co(NH3 )6] 3+(lll) absorb light in the visible region. Option A (I) > (II) > (III) is correct Explaination:: In a coordination compound, the strong field ligand causes higher splitting of the d-o... 1
- The possible number of geometrical isomers for the complex [CoL2Cl2 ] - (L = H2NCH2CH2O- ) is (are) Answer is 5 2
- A long solenoid of radius R carries a time (t) dependent current I(t) = I0t(1 − t). A ring of radius 2R is placed coaxially near its middle. Correct answer is option C 1
- A 60 HP electric motor lifts an elevator with a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, Correct option is d) 1.9 ms P = Fv + Mgv Applied power = 4000 × v + 20000 v 60 × 246 = 4000 v + 20000 v v = 1.865 v = 1.9 m/s Rounding it of... 1
- A polarizer-analyzer set is adjusted such that the intensity of light coming out of the analyzer is just 10 % of the original intensity. Correct Answer is option D 18^o Intensity after polarisation through polaroid = I_ocos²φ So, 0.1I_o = I_ocos²φ ⇒cosφ = √0.1 ⇒cosφ = 0.316 Si... 1
- Give an example of a double displacement reaction other than the one given in Activity 1.10 Reaction Between silver nitrate (AgNO3) and Sodium chloride (NaCl) is an example of double displacement reaction. Here Silver donates its io... 1
- Why does the colour of copper sulphate solution change when an iron nail is dipped in it? When an iron nail dipped in the copper sulphate solution, iron displaces copper from the copper sulphate because iron is more reactive than... 1
- Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas In activity 1.7, gas collected in one of the test tubes is double of the amount collected in the other because water gets hydrolysed to rele... 2
- Write the reaction of the substance ‘X’ named in (i) above with water CaO + H2O → Ca(OH)2 2
- Name the substance ‘X’ and write its formula. The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide and its formula is CaO. 1
- Sodium hydroxide solution in water reacts with hydrochloric acid solution to produce Sodium chloride solution and water. NaOH + HCl → NaCl + H₂O 2
- Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and solution of Sodium chloride. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl 2