441.
Which of the following is used to manufacture carrier bags?
A
LDPE (Low Density PolyEthylene)
B
HDPE (High Density PolyEthylene)
C
Polycarbonate
D
PVC
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Which of the following is used to manufacture carrier bags?
LDPE (Low Density PolyEthylene)
HDPE (High Density PolyEthylene)
Polycarbonate
PVC
Which plastic is used to laminate kitchen worktops?
Epoxy resin
Polyester (PET)
Melamine
PVC
The process of combining two or more distinct polymer molecules to form a new product with different characteristics is called as
binding
stabilizing
filling
blending
Which of the following is an example of thermoplastic material?
Camera bodies
Automobile parts
Electric plugs
Electric insulation
Which plastic materials contain strong cross linkings in their molecular structure?
Thermoplastic materials
Thermosetting materials
Both a. and b.
None of the above
Thermosetting materials are
the plastics which can be softened even after they have set and hardened
the plastics which require heat and pressure to mould them into shape
both a. and b.
none of the above
Which of the following characteristics does not affect the properties of plastics?
Their molecular structure
Their degree of polymerization
Both a. and b
None of the above
Which process is used to manufacture plastic pipes?
Injection moulding
Extrusion moulding
Blow moulding
Vacuum forming
Which of the following is commonly used in schools for vacuum forming?
Melamine (MF)
HIPS
Polyester
PVC
Bryophyllum can reproduce by its
stem
leaves
roots
flower
A spore producing plant is
rose
bread mould
potato
ginger
Mature ovary forms the
seed
stamen
pistil
fruit
The process of fusion of the male and the female gametes is called
fertilisation
pollination
reproduction
seed formation
The reproductive part of a plant is the
leaf
stem
root
flower
In plants, water is transported through
Xylem
Phloem
Stomata
Root hair
The plant which traps and feeds on insects is:
cuscuta
china rose
pitcher plant
rose
Plants take carbon dioxide from the atmosphere mainly through their:
roots
stem
flowers
leaves
Which part of the plant gets carbon dioxide from the air for photosynthesis.
root hair
stomata
leaf veins
sepals
Amarbel is an example of?
Autotroph
Parasite
Saprotroph
Host
A truth, which is self-evident is a/an
Axiom
Postulate
Either (1) or (2)
Hypothesis