CBSE (UGC) NET Paper 1 Questions (Part 3 of 30)

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  1. The pH value of distilled water is always below 7. This is because

    1. distillation reduces the ionic product of water

    2. during distillation inorganic salts are removed

    3. nitrogen from air gets dissolved in it

    4. CO2 from air dissolves in it

  2. Photosynthesis in water bodies is restricted to a certain depth. This is mainly because

    1. temperature decreases with depth

    2. light intensity decreases with depth

    3. dissolved CO2 is available only to a certain depth

    4. nutrients are available only to a certain depth

  3. The velocity of P (pressure) and S (shear) seismic waves depends on the compressibility, shear modulus and density of the medium. The inner core of the Earth is inferred to be liquid using seismic wave travel time. This is because

    1. the density of the inner core is the highest

    2. the inner core has a very high compressibility

    3. both P and S waves pass through the inner core

    4. the S wave does not pass through the inner core

  4. One of the following chemicals used as food preservative is

    1. sodium benzoate

    2. sodium alkylbenzene sulfonate

    3. ethylene glycol

    4. aspartic acid

  5. Qualitative analysis of Al3 + in presence of Fe3 + and Cr3 + is based on

    1. reducing nature of Fe3 +

    2. oxidizing nature of Cr3 +

    3. amphoteric nature of Fe3 +

    4. amphoteric nature of Al3 + and Cr3 +

  6. Hydrolysis of t-butyl chloride in presence of aqueous alkali produces t-butyl alcohol The rate of hydrolysis depends on

    1. concentration of t-butyl chloride

    2. concentration of alkali

    3. amount of water

    4. concentration of both alkali and t-butyl chloride

  7. Which one of the following would give natural rubber upon polymerisation?

    1. CH3-CH2 = CH2 H CH3

    2. n-propyl-C = C-CH = CH2 CH3 CH3

    3. H3C-C = C-CH = CH2 CH3

    4. CH2 = C-CH = CH2

  8. The ionization potential (IP) of hydrogen atom is 13.6 eV. The estimated second IP of the helium atom (in eV) is

    1. 6.8

    2. 27.2

    3. 54.4

    4. 13.6

  9. The following molecule has a non-zero dipole moment

    1. CH4

    2. CO2

    3. NH3

    4. BF3

  10. The oxidation number of Cr in CrO5 is

    1. + 6

    2. + 3

    3. + 10

    4. + 5

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