General Science - Online Test
Q1. An iron needle floats on the surface of water. This phenomenon is attributed to
Answer : Option C
Explaination / Solution:
The answer lies in the surface tension of the water, As the cohesive forces between the molecules is responsible for the surface tension. When the molecules on the glass or container do not have a surface to stick to, they cohere more strongly to the molecules they are associated with. Since the molecules on top have no neighbours on the top to cohere to, they associate with their other neighbours more strongly. This creates a strong bond between the top layer of molecules. The molecules inward face no net force because they all cancel out each other. However, the surface molecules face a net inward force because there is no force for them on the surface to cancel it. This causes the molecules on the surface to 'contract' and resist being broken or stretched.
When a small body like a needle is placed onto the water carefully, the surface tension will not break due to the small mass of the object.
As long as the surface tension is undisturbed, the needle will continue to float. Agitating the water will cause the surface tension to break and hence the needle will then sink
As long as the surface tension is undisturbed, the needle will continue to float. Agitating the water will cause the surface tension to break and hence the needle will then sink
Q2. Nature of binding forces present in carbondioxide molecules in solid state are
Answer : Option D
Explaination / Solution:
O=C=O<−>−O−C+=O
Q3. The correct order for instrument used for measuring stomatal size, atmospheric pressure and osmosis is
Answer : Option A
Explaination / Solution:
Porometer is used to measure stomatal size, monometer is used to measure atmospheric pressure and osmometer is used to measure osmosis.
Q4. A normal adult man and woman have ---------WBC per cubic millimetre.
Answer : Option B
Explaination / Solution:
A normal adult male and female have about 4.5 to 5 million of WBC per cubic millimeterof blood. The number of white blood cells increases during infection against pathogens.
Q5. Which one is not a member of kingdom Protista?
Answer : Option C
Explaination / Solution:
Kingdom Protista includes unicellular, eukaryotic organisms only. Phycomycetes is a subdivision of fungus which are multicellular. Protozoa, slime molds and euglenoids are part of kingdom Protista.
Q6. Some of the polynuclear hydrocarbons having fused benzene ring system have the property of being
Answer : Option D
Explaination / Solution:
Polynuclear hydrocarbons are carcinogenic,i.e. cancer producing
Q7. Which statutory body is having power regarding stock market
Answer : Option A
Explaination / Solution:
The Securities and Exchange Board of India (SEBI) is the regulator for the securities market in India.
Q8. A thermodynamic state function is a physical quantity
Answer : Option B
Explaination / Solution:
State function is one which is only dependent on initial and final state of the system and is independent of the path by which that change has occurred.
Q9. Devaluation is a
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. When should measures of location and dispersion be computed from grouped data rather than from individual data values?
Answer : Option C
Explaination / Solution:
No Explaination.
