Q81. The blue colour of the clear sky is due to
[A] Dispersion of light
[B] Reflection of light
[C] Refraction of light
[D] Diffraction of light
Q82. Tides are primarily a result of the
[A] Ocean Currents
[B] Earth’s pressure system
[C] Attraction of the Moon
[D] Farrel’s law
Q83. The non green heterotrophic plants of plant kingdom are
[A] Ferns
[B] Algae
[C] Fungi
[D] None of these
Q84. Which of the following stars is nearest to the sun?
[A] Sirius
[B] Betelgeuse
[C] Proxima Centauri
[D] Deneb
Q85. Who is the planet moving in the opposite direction than other planets in Solar System?
[A] Pluto
[B] Neptune
[C] Saturn
[D] Uranus
Q86. What element is used in bright flashing advertising signs?
[A] Helium
[B] Neon
[C] Radon
[D] Mercury
Q87. Fertile riverine alluvial soil is best suited for producing
[A] corn
[B] tea
[C] cotton
[D] rice
Q88. The hardened material available on earth is
[A] Iron
[B] Gold
[C] Platinum
[D] Diamond
Q89. Which one of the following types of waves are used in a night vision apparatus?
[A] Infra-red waves
[B] Radio waves
[C] Microwaves
[D] None of the above
Q90. Where is the DNA located in a eukaryotic cell?
[A] Mitochondria
[B] Nucleus
[C] Chromosomes
[D] All of the above