In a railway track, two rails are joined end to end with a gap tin between them because?
A. Steel can be saved
B. Accidents due to contraction in winter can be avoided
C. Air gaps are necessary for bearing the weight of running train
D. Accidents due to expansion in summer can be avoided
E. All of these
A. Parasite
B. Scavenger
C. Predator
D. Mammal
E. None of these
A. Seedless fruits
B. Parthenogenesis fruits
C. Parthenocarpic fruits
D. placental fruits
E. Organic fruits
Quartz crystal in quartz watches work on the principle called?
A. Photoelectric effect
B. Stark effect
C. Thermionic effect
D. Piezo-electric effect
E. None of these
A. Glaciers
B. Desert
C. Islands
D. Volcanoes
E. Fertile land
A. Carbon dioxide
B. Sugar
C. Bacteria
D. Oxygen
E. None of these
The phenomenon of Aurora Borealis, the display of red and green lights in northern hemisphere is due to radiations from____________ ?
A. Ionosphere
B. Troposphere
C. Mesosphere
D. Stratosphere
E. None of these
A. Infra-red
B. Ultraviolet
C. X-rays
D. Gamma rays
E. None of these
A. Manganese
B. Magnesium
C. Gypsum
D. Bauxite
E. None of these
Sedimentary rocks are__________?
A. Porous
B. Hard
C. Rough
D. Brittle
E. Volcanic