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Mixed GATE Test

Description: GATE NET CSIRNET SLET AIEEE IITJEE
Number of Questions: 15
Created by:
Tags: GATE Engineering Sciences - XE Orientation Effect as Exemplified by Various Functional Groups Environmental Engineering Surface Runoff B, Al, Si, N, P, and S s.p. and d Block Elements Proteins
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According to the galvanic series, which of the following substances will corrode at the fastest rate?

  1. Stainless steel 316

  2. Yellow brass

  3. Monel 400

  4. Titanium

  5. Naval brass 464

Show answer
Correct Option: E
Explanation:

Yes, it is the correct answer.

Which of the following are corrosion protection techniques involving metallic coating?

  1. Electroplating
  2. Galvanising
  3. Anodising
  4. Metal spraying

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 1, 2 and 4

  4. Only 2, 3 and 4

  5. Only 3 and 4

Show answer
Correct Option: C
Explanation:

Yes, it is the correct answer. Electroplating, galvanising and metal spraying are the methods of metallic coating for protection against corrosion.

Which of the following statements is/are true about corrosion?

  1. In an electrochemical corrosion, corrosion occurs at anode, but rust is deposited at the cathode.
  2. Dry corrosion is slow process while wet corrosion is a fast process.
  3. In an electrochemical corrosion, corrosion does not depend on the size of the anodic part of the metal.
  4. Dry corrosion involves direct attack of the chemicals on the metal surface.

  1. Only 1, 2 and 3

  2. Only 2, 3 and 4

  3. Only 1, 3 and 4

  4. Only 1, 2 and 4

  5. All of these

Show answer
Correct Option: D
Explanation:

This option is correct because all are true. In an electrochemical corrosion, corrosion occurs at the anode but rust is deposited at the cathode, dry corrosion is slow process while wet corrosion is a fast process, and it involves direct attack of the chemicals on the metal surface.

Which of the following forms of corrosion occurs due to the concentration difference of two regions of same metal component?

  1. Pitting corrosion

  2. Stress corrosion

  3. Uniform corrosion

  4. Galvanic corrosion

  5. Crevice corrosion

Show answer
Correct Option: E
Explanation:

Crevice corrosion occurs due to the concentration difference of two regions of the same metal component. Corrosion takes place at the part that is of lower concentration. Thus, this option is correct.

TMS is the most suitable reference compound for NMR spectroscopy. However, it cannot be used with deuterium oxide solvent because:

  1. it is highly volatile
  2. it is chemically inert
  3. it is magnetically isotropic
  4. it is insoluble in deuterium oxide

  1. Only 1

  2. Only 2

  3. Only 2 and 3

  4. Only 3 and 4

  5. Only 4

Show answer
Correct Option: E
Explanation:

This option is correct because chemical inertness, magnetically isotropic nature and high volatility of tetramethylsilane (TMS) makes is reference compound of choice for NMR studies. Because of its insolubility in deuterium oxide, it cannot be used with this solvent.

Which of the following statements is/are correct?

  1. Metal cladding is a process of sandwiching a metal between two corrosion resistant metals.
  2. In galvanising, zinc protects iron sacrificially.
  3. Thinner reduces viscosity of paint and increases it elasticity.
  4. Anodic coating is done by a metal, which is situated after the base metal in the electrochemical series.

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 3 and 4

  4. Only 2, 3 and 4

  5. Only 1, 2 and 4

Show answer
Correct Option: B
Explanation:

This option is correct because all the three statements are true.

In which of the following bonds the strongest absorption in the IR spectra will be observed?

  1. B-H

  2. C-H bond

  3. N-H bond

  4. O-H bond

  5. S-H bond

Show answer
Correct Option: D
Explanation:

The strength of the absorption depends on - (i) polarity of the bond and  (ii) the number of bonds. O-H has highest bond polarity, hence it will show strongest absorption in IR.

Which of the following statements is/ are true?

  1. Microwave radiation has shorter wavelength than IR radiation.
  2. IR radiation has higher wave number than UV radiation.
  3. UV radiation is more energetic than visible light.
  4. Gamma rays have higher frequency than X rays.

  1. Only 2 and 4

  2. Only 1 and 4

  3. Only 1 and 2

  4. Only 2 and 3

  5. Only 3 and 4

Show answer
Correct Option: E
Explanation:

Yes, this is correct, as both the statements are true.

Which of the following mentioned methods are used for disinfection of potable water? I. Break point chlorination II. Hot soda-lime process III. Ozonisation IV. Foaming V. Chloramine treatment

  1. Only I, IV and V

  2. Only I, II and V

  3. Only II, III and IV

  4. Only I, III and V

  5. Only II, III and V

Show answer
Correct Option: D
Explanation:

Yes, it is correct. Break point chlorination, Ozonisation and Chloramine treatment are methods of disinfection of water. Hot soda lime process is a method of softening of hard water. Foaming is the production of bubbles and foams in boiler feed water which do not break easily.

 

Which of the following do not contain sulphur?

  1. Cinnabar
  2. Gypsum
  3. Lithopone
  4. Talc

  1. Only 1 and 4

  2. Only 2 and 3

  3. Only 2, 3 and 4

  4. Only 2 and 4

  5. Only 3 and 4

Show answer
Correct Option: B
Explanation:

Gypsum is a very soft sulphate mineral composed of calcium sulphate dihydrate, with the chemical formula CaSO4•2H2O. Lithopone is a white pigment consisting of a mixture of barium sulphate (BaSO4) and zinc sulphide (ZnS). Lithopone is a white pigment consisting of a mixture of barium sulphate (BaSO4) and zinc sulphide (ZnS). Talc is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2.

Which of the following statements are not false?

  1. The protecting power of lyophilic colloidal sol is expressed in terms of gold number.
  2. Rate of physical adsorption increase with decrease in temperature.
  3. In Freundlich Adsorption isotherm, the value of 1/n is 0 in case of physical adsorption and 1 in case of chemisorptions.
  4. In Langmuir's model of adsorption of a gas on a solid surface the mass of gas striking a given area of surface is independent of the pressure of the gas.

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 1 and 4

  4. Only 2 and 3

  5. Only 3 and 4

Show answer
Correct Option: A
Explanation:

Yes, both the statements are true. Hence, it is the correct answer.

Match column A and column ||| |---|---| |Column A |Column B| |a. Bathochromic shift|i. The shifting of absorption to lower frequency.| |b. Hypsochromic shift|ii. Increase in absorbance| |c. Hypochromic shift|iii. Decrease in absorbance| |d. Hyperchromic shift|iv. Blue shift|

  1. a-i, b-iv, c-ii, d-iii

  2. a-i, b-iv, c-iii, d-ii

  3. a-iv, b-i, c-ii, d-iii

  4. a-iii, b-ii, c-i, d-iv

  5. a-ii, b-iii, c-iv, d-i

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer. All are correctly matched.

Which of the following is/are examples of iron-sulphur proteins?

  1. Rubredoxin
  2. Methane monooxygenase
  3. Rieske proteins
  4. Aconitase

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 1, 3 and 4

  4. Only 2 and 3

  5. Only 2, 3 and 4

Show answer
Correct Option: C
Explanation:

Yes, all are correct. Rubredoxin is a small iron-sulphur protein found in various sulphur-metabolising bacteria. Rieske proteins are iron-sulphur protein components of cytochrome bc1 complexes and cytochrome b6f complexes, which were first discovered and isolated by John S. Rieske and co-workers in 1964. Aconitase is an iron-sulphur protein that catalyses the interconversion of citrate and isocitrate

Match entries in column I (elements) and Column II (their medical uses) ||| |---|---| |Column I |Column II| |P. Selenium|1. Anti-dandruff| |Q. Magnesium|2. Antacid| |R. Antimony|3. Antileishmaniasis| |S. Tin|4. Anti-caries|

  1. P-1, Q-2, R-3, S-4

  2. P-1, Q-3, R-2, S-4

  3. P-2, Q-1, R-4, S-3

  4. P-2, Q-3, R-1, S-4

  5. P-4, Q-3, R-2, S-1

Show answer
Correct Option: A
Explanation:

Yes, it is correct. Selenium sulphide is used in anti-dandruff shampoos. Magnesium hydroxide is used as a laxative to relieve occasional constipation and as an antacid to relieve indigestion, sour stomach, and heartburn. Antimony compounds are used as Antileishmaniasis agents, such as sodium stibogluconate. Stannous fluoride is used as anticaries actives.

Match entries in column I (elements) and Column II (used in the treatment of ||| |---|---| |Column I |Column II| |P. Li|1. Gastritis| |Q. Pt|2. Rheumatoid arthritis| |R. Au|3. Bipolar disorder| |S. Bi|4. Cancer|

  1. P-4, Q-2, R-1, S-3

  2. P-3, Q-4, R-2, S-1

  3. P-2, Q-3, R-4, S-1

  4. P-1, Q-4, R-2, S-3

  5. P-1, Q-3, R-2, S-4

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer, as all are correctly matched. Lithium salts are widely used to treat bipolar disorder (BPD). The square planar Pt(II) complex, cis-platin is used in chemotherapy of cancer. Various gold compounds have been used in the treatment of rheumatoid arthritis. All are Au(I) complexes containing thiolate ligands. Bismuth salts are used in the  treatment of gastritis.

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