A moderator is used in nuclear reactor in order to ?
A. Accelerate the neutrons
B. Slow down the speed of the neutrons
C. Increase the number of elections
D. Decrease the number of electrons
A. Accelerate the neutrons
B. Slow down the speed of the neutrons
C. Increase the number of elections
D. Decrease the number of electrons
A. Porous
B. Hard
C. Rough
D. Brittle
A. Manganese
B. Magnesium
C. Gypsum
D. Bauxite
A. Infra-red
B. Ultraviolet
C. X-rays
D. Gamma rays
A. Ionosphere
B. Troposphere
C. Mesosphere
D. Stratosphere
A. Carbon dioxide
B. Sugar
C. Bacteria
D. Oxygen
A. Glaciers
B. Desert
C. Islands
D. Volcanoes
A. Photoelectric effect
B. Stark effect
C. Thermionic effect
D. Piezo-electric effect
A. Seedless fruits
B. Parthenogenesis fruits
C. Parthenocarpic fruits
D. placental fruits
A. Parasite
B. Scavenger
C. Predator
D. Mammal