General Science - Online Test
Q1. The alkali metals and their salts impart characteristic colour to an oxidizing flame because:
Answer : Option C
Explaination / Solution:
Alkali metals have one unpaired electron in their valence shell which gets excited by absorbing the energy from flame, excited states are very unstable and quickly move back to lower state ,at that time they emit the energy in the form of radiation in visible reason of electromagnetic spectrum and is abserved as characteristic colour.
Q2. At resonance the current in an LCR circuit
Answer : Option D
Explaination / Solution:
in LCR series circuit current
at resonance
hence current will be maximum.
Q3. An example of durable goods is
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. All those atoms or molecules which have an odd number of electrons are
Answer : Option D
Explaination / Solution:
They will have unpaired electrons
Q5. Indifference curve represents?
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. An equipotential surface is a surface
Answer : Option D
Explaination / Solution:
When the potential at all points on the surface is the same; such a surface is called an equipotential surface. The potential difference between any two points on an equipotential surface is zero, while the potential may be positive, negative or even zero.
Q7. Which polymers occur naturally in nature
Answer : Option C
Explaination / Solution:
Starch and cellulose occur naturally.
Q8.
is the structure of
is the structure of
Answer : Option D
Explaination / Solution:
This structure is of H3PO4 . (Orthophosphoric acid). It has three P-OH and one P=O bonds.
Q9. Centre of gravity can be defined
Answer : Option C
Explaination / Solution:
The point at which the entire weight of a body may be thought of as centered so that if supported at this point the body would balance perfectly, so it can also be defined as as that point where the total gravitational torque on the body is zero.
Q10. When water moves out of the cell and the cell membrane of a plant cell shrinks away from its cell is called
Answer : Option C
Explaination / Solution:
Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell.
Plasmolysis is one of the results of osmosis and occurs very rarely in nature, but it happens in some extreme conditions.
