Radioactivity that takes the form of high energy electromagnetic waves would be:
alpha
beta
gamma
zeta
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Radioactivity that takes the form of high energy electromagnetic waves would be:
alpha
beta
gamma
zeta
Quick electron emissions are called:
alpha decay
beta decay
gamma decay
radioactive half-life
What is it called when two atomic nuclei are combined?
nuclear fission
nuclear fusion
nuclear decay
chain reaction
Particles that are helium nuclei are called:
alpha particles
beta particles
gamma particles
There are no particles that are helium nuclei
Whether or not a nuclear fission reaction becomes self-sustaining depends on the release of:
energy
protons
neutrons
electrons
Radioactivity is spontaneous and random.
true.
false.
When unstable nuclei undergo radioactive decay, they emit three types of radioactivity. Which is not one of them?
alpha
beta
gamma
delta
Following is the unique to polymeric materials:
Elasticity
Viscoelasticity
Plasticity
None
The word polymer meant for material made from ?
Single entity
Two entities
Multiple entities
Any entity
Strong covalent bonds exists between polymer chains in ...............
Thermoplasts
Thermosets
Elastomers
All polymers
These polymers consist of coil-like polymer chains:
Thermoplasts
Thermosets
Elastomers
All polymers
In general, strongest polymer group is .................
Thermoplasts
Thermosets
Elastomers
All polymers
These polymers can not be recycled:
Thermoplasts
Thermosets
Elastomers
All polymers
Elastic deformation in polymers is due to .................
Slight adjust of molecular chains
Slippage of molecular chains
Straightening of molecular chains
Severe of Covalent bonds
Polymers are ......... in nature.
Organic
Inorganic
Both (a) and (b)
None
One of characteristic properties of polymer material ...........
High temperature stability
High mechanical strengthHigh elongation
Low hardness
Kevlar is commercial name for ................
Glass fibers
Carbon fibers
Aramid fibers
Cermets
Example for a physical pollutant
Water
Air
Radiation
Plant
The place where the worst nuclear disaster took place?
Washington
Chernobyl
Bhopal
Japan
The legally binding international agreement to reduce Greenhouse gases by 5% 2012 is _________
Vienna convention
Montreal Protocol
Kyoto Protocol