CBSE (UGC) NET Paper 1 Questions (Part 4 of 30)

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  1. A B (salt) Na + H2 (alcohol) B MeI C (ether) C Conc. HI MeI A NaOH/I2 iodoform heat. The alcohol A, salt B and ether C, are respectively

    1. CH3OH, CH3ONa, CH3 − O-CH3

    2. CH3OH, C2H5ONa, CH3 − O-C2H5

    3. C2H5OH, C2H5ONa, C2H5 − O-C2H5

    4. C2H5OH, C2H5ONa, CH3O-C2H5

  2. In any ecosystem, the primary producers such as photosynthetic plants are the most abundant and predators such as tigers are the least abundant. The fundamental law responsible for this pattern is

    1. first law of thermodynamics

    2. second law of thermodynamics

    3. Mendel's laws of genetics

    4. law of conservation of mass

  3. In the Siberian forests, carbon fixation is expected to be maximum in

    1. January

    2. July

    3. October

    4. April

  4. Movement of water in a tree takes place in

    1. roots only

    2. in the central part of the stem

    3. in the peripheral part of the stem

    4. leaves only

  5. Which of the following is not used as a fertilizer?

    1. Ammonium nitrate

    2. Ammonium phosphate

    3. Urea

    4. Sodium chloride

  6. In DNA, Adenosine pairs with Thymine, and Guanine pairs with Cytosine. If Adenosine constitutes 18% and Guanine constitutes 24% of all nucleotides in a DNA preparation, it must be a

    1. single stranded DNA

    2. double stranded DNA

    3. very short stretch of double stranded DNA

    4. multi-chromosomal DNA

  7. A bacterium which is 1 in diameter and divides every 20 minutes, forms a 1 mm diameter colony in 24 hours in a growth medium with limited nutrients. The number of cells in the colony is approximately

    1. 1000

    2. 109

    3. 2 × 72

    4. 272

  8. Burns caused by steam are more serious than burns caused by boiling water because

    1. steam has large latent heat

    2. steam has a very large specific heat compared to water

    3. steam is hotter than boiling water

    4. steam being a gas makes easy contact with skin

  9. The largest decimal number that a four byte integer can represent is approximately

    1. 105

    2. 107

    3. 109

    4. 1011

  10. A modern personal computer is capable of multiplying two numbers in a few

    1. picoseconds

    2. nanoseconds

    3. microseconds

    4. milliseconds