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Learn NDA MCQs with answers [Page 6 of Department 58]
51) The two isotopes of uranium, 235U and 238U have
1. equal number of protons
2. equal number of neutrons
3. 92 protons each
Which of the above statements is/are correct?
53) Heavy water
1. contains more dissolved air
2. contains dissolved minerals and salts
3. has deuterium in place of hydrogen
4. is used in nuclear reactors
The correct statements are:
55) Pulses are amongst the most important group of food plants, second in importance only to the cereals. Why are they considered so important?
1. They are the most important source of proteins not only for the human population but also for animals, both herbivores and carnivores.
2. They save us billions of rupees every year in fertilizer cost by fixing atmospheric nitrogen, being the only group of crop plants that is capable of doing so .
Select the correct answer from the following.
56) Some scientist and discovery pairs are given below:
1.Bohr-Model of hydrogen atom
2.Einstein-Photoelectric effect
3.Chadwick-Neutron
4.De Broglie-Matter waves Which of the above pairs are correctly matched?
57) Television viewers using dish antenna to receive satellite (DTH) signals do not receive signals during rain because:
(1) Their antennas are small
(2) Rain droplets absorb the energy of radio waves
(3) Rain droplets disperse the energy of radio waves from their original direction.
Which of the above statement/statements is /are correct?
58) A colour-blind man marries a normal woman whose father was colour-blind. They have 3 children, two daughters and ason. What are the chances of their children being colour-blind?
(A) One of the daughters will be colour-blind but another daughter and son will be normal.
(B) Only the son will be colour-blind
(C) Both the daughters will be colour-blind but the son will be normal.
(D) One of the daughters will be colour-blind and the other normal, but the son has only 50% chance of being normal.
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