1. Companion
cells are unique to
1) Bryophytes
2) Pteridophytes
3) Angiosperms
4) Gymnosperms
2) Pteridophytes
3) Angiosperms
4) Gymnosperms
Exp- companion cell, a specialized parenchyma cell, located in the
phloem of flowering
plants and closely associated with the development and function of a sieve-tube
element.
2.Which one of the
following is an insulator?
1) Copper
2) Wood
3) Mercury
4) Aluminium
2) Wood
3) Mercury
4) Aluminium
EXP- Examples of insulators include
plastics, Styrofoam, paper, rubber, glass and dry air.
3.Bubbles
of air rise up through liquids due to:
1) Surface tension and
adherence
2) viscosity and buoyancy.
3) air current over the liquid and buoyancy
4) Up thrust and surface tension.
2) viscosity and buoyancy.
3) air current over the liquid and buoyancy
4) Up thrust and surface tension.
4.Zeolite
is
1)
hydrated ferric oxide
2) hydrated sodium aluminium silicate
3) sodium hexameta phosphate
4) sodium tetra borate
2) hydrated sodium aluminium silicate
3) sodium hexameta phosphate
4) sodium tetra borate
EXP- any of a large group of minerals consisting of
hydrated aluminosilicates of sodium, potassium, calcium, and barium. They can
be readily dehydrated and rehydrated, and are used as cation exchangers and
molecular sieves.
5.The
boiling point of liquids vary as
1) pressure varies
2) temperature varies
3) volume varies
4) density varies
2) temperature varies
3) volume varies
4) density varies
6.The
largest source of pollution in the world is
1)
herbicides and insecticides
2) Automobile exhausts
3) Sewage and garbage
4) Industrial effluents
2) Automobile exhausts
3) Sewage and garbage
4) Industrial effluents
7 .Lacrymal glands are situated
in the
1) Palms
2) Buccal cavity
3) Eye orbit
2) Buccal cavity
3) Eye orbit
4) Stomac
h
h
8. The most extensive
use of molasses after fermentation is for producing
1) Methanol
2) Sugar
3) Ethanol
4) Sugarcane
2) Sugar
3) Ethanol
4) Sugarcane
9. Acid rain is caused
due to pollution of atmosphere by
1) oxides of nitrogen and sulphur
2) oxides of nitrogen and phosphorous
3) oxides of carbon and nitrogen
4) oxides of nitrogen and methane
2) oxides of nitrogen and phosphorous
3) oxides of carbon and nitrogen
4) oxides of nitrogen and methane
10.Why the Earth is
having its own atmosphere ?
1)
Winds
2)
Clouds
3) Gravity
4)
Rotation of the Earth
11.Which enzyme is
present in all members of the animal kingdom except Protozoa?
1)
Insulin
2)
Pepsin
3)
Renin
4) Amylase
12.At boiling point of
liquids , its
1)
Temperature increases
2)
Atmospheric pressure increases
3)
Temperature remains constant
4)
Vapour pressure decreases
13.A
level of atmosphere which is composed partly of electrons and positive ions is
called
1)
Troposphere
2)
Ionosphere
3)
Stratosphere
4)
Mesosphere
14. The
most serious air pollutant causing health hazard is
1)
Sulphur dioxide
2)
Carbon monoxide
3)
Ozone
4)
Nitrogen oxide
Exp- It is a toxic gas with
a burnt match smell. It is released naturally by volcanic
activity and is produced as a by-product of
the burning of fossil fuels contaminated
with sulfur compounds.
the most
significant being the atmosphere of Venus, where it is the third-most significant atmospheric gas at
150 ppm.
15. Helium
is added to the oxygen supply of deep sea divers because it is _________
1)
less poisonous than nitrogen
2)
Lighter than nitrogen
3)
Readily miscible with oxygen
4) less soluble in blood than
nitrogen at high pressure
Exp- All other gases start dissolving in blood, causing weird effects
Note - Do astronauts breathe pure oxygen?
This means that the suits are filled with oxygen. Once in
their suits, astronauts breathe pure oxygen for a few
hours. Breathing only oxygen gets rid of all
the nitrogen in an astronaut's body. If they didn't get rid of
the nitrogen, the astronauts might get gas bubbles in their body
when they walked in space.
16. Terylene
is a condensation polymer of ethylene glycol and which acid?
1)
Benzoic Acid
2)
Salicylic acid
3)
Phthalic acid
4)
Terephthalic acid
Exp- Terephthalic acid white solid
is a commodity chemical, used principally as a precursor to the polyester PET, used
to make clothing and plastic bottles.
On a
clean glass plate a drop of water spreads to form a thin layer whereas a drop
of
17. mercury
remains almost spherical because ________
3) Cohesion of mercury is greater
than its adhesion with glass
Adhesion: Water is
attracted to other substances.
Cohesion: Water is
attracted to water (cohesion describes particles that are the same and tend to stick
together)
Mercury
has a density of 13.6 grams per centimetre
squared. Thus, within the same volume, mercury has more mass than water.
But See what question has asked..
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