IAS Topper Karishma Nair [AIR 14]
Originally from the Palakkad district of Kerala, Karishma Nair cracked the UPSC Civil Service Exam 2020 in her second attempt... View Article
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29 Sep 2021: The Hindu Analysis
UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 29th Sep 2021. Important news and... View Article
IAS Topper 2020 [AIR 28] – Divya Mishra
Divya Mishra, a girl from Kanpur, cleared UPSC Civil Services Examination 2020 and secured AIR 28 in her third attempt.... View Article
Vaibhav Rawat (AIR 25) – UPSC Topper 2020
Vaibhav Rawat’s elation knew no bounds when the UPSC declared its results for 2020 on September 24, 2021. He acquired... View Article
The suitable method to deionize water is:
a. Synthetic resin c. Permutit method b. Calgon d.Clark’s method Solution: Answer: (a) Pure demineralised (de-ionized) water free from all... View Article
Calculate the molarity of 3.3 molal solution of KCl whose density is 1.28 g/ mL.
a. 3.7 M b. 5.0 M c. 3.4 M d. 2.5 M Solution: Answer: (c) Given, Molality = 3.3 m... View Article
Which polymer is made by novolac and formaldehyde addition?
a. Melamine b. Bakelite c. Polyester d. None of the above Solution: Answer: (b) Novolac on heating with formaldehyde undergoes... View Article
Formula of hydroxyapatite is
a. (CaPO4)6.CaF2 b. 3[Ca3(PO4)2].Ca(OH)2 c. 3[Ca3(PO4)2].CaF2 d. Ca3(PO4)2.Ca(OH)2 Solution: Answer: (b) Correct formula of hydroxyapatite is 3[Ca3(PO4)2].Ca(OH)2. Hydroxyapatite is the... View Article
Below are two statements:Statement I: Frenkel defect provides colour in a solid.
Statement II: Frenkel defect is an interstitial defect.
a. Statement I is correct, and statement II is correct. b. Statement I is correct, and statement II is incorrect.... View Article
Find the number of lone pairs on the central atom in interhalogen compound IX3
a. 1 c. 2 b. 3 d. 5 Solution: Answer: (c) Hybridization of interhalogen compound IX3 = sp3d. Structure: 3... View Article
Calculate the number of 4f electrons present in Gd.2+ (Atomic number = 64)
Solution: Answer: (8) Electronic configuration of Gd = [Xe]4f75d1 6s2 Electronic configuration of Gd2+ = [Xe]4f75d1 Due to orbital contraction,... View Article
Find the graph between electric field intensity and distance r from the centre, for the given arrangement of concentric spheres. Charge in the inner solid sphere is uniformly distributed in volume.
Solution: Answer: (b)
Two cars A and B moving on a straight road. Car B passes car A by a relative speed of 45 m/s. At what speed does the driver of car B observe car A in the side mirror of focal length 10 cm when car A is at a distance of 1.9 m from car B?
a. 9/80 b. −9/80 c. −7/80 d. 7/80 Solution: Answer: (b) Given, u = −1.9 m f = 10 cm... View Article
A cube made up of wire each of resistance R. Then find equivalent resistance across its diagonal.<
a. 5R/6 b. 3R/4 c. 7R/12 d. R Solution: Answer: (a) Due to symmetry C, E, F, same potential and... View Article
Find the equivalent gate – Physics Problem
Question: Find the equivalent gate a. AND gate b. NOR gate c. NAND gate d. OR gate Solution: Answer: (d)
A spherical shell of mass′m′ and radius ′R′ is given, then which of the following is incorrect for inside the shell?
a. Gravitational field is zero b. Gravitation potential is zero c. The gravitational field is the same everywhere d. Gravitational... View Article
Initial fuel in a rocket is 1000 kg. If it was given an acceleration of 20 m/s2 the velocity of fuel with respect to the rocket is 500 m/s. Find the rate of consumption of fuel.
a. 30 kg/s b. 60 kg/s c. 900 kg/s d. 80 kg/s Solution: Answer: (b) As we know that for... View Article
If a wavelength of incident light changes from 300 nm to 400nm, then find the change in sloping potential. If the work function of metal = 2.5 eV?
a. 1.03 eV b. 2.10 eV c. 1.85 eV d. 2.03 eV Solution: Answer: (a) We know that,
Charge Q is given to a spherical conductor of radius R. It is surrounded by a concentric conducting shell of inner radius a and outer radius b. Corresponding electric field diagram will be:
Solution: Answer: (a)
Compare the RMS speed of hydrogen, oxygen, and carbon dioxide at the same temperature.
a. VH2 < VO2 < VCO2 b. VH2 > VO2 > VCO2 c. VH2 > VO2 < VCO2 d. VH2... View Article
