General Science - Online Test
Q1.
Consider the unbalanced chemical equation ,
----- Al + ------ → ------ .
The equation for above reaction can be balanced by inserting the following in blank spaces
Answer : Option A
Explaination / Solution:
The given equation gets balanced by inserting coefficients ( 4 , 3 , 2 ) in blank spaces from LHS to RHS ) . The balanced equation is -
Q2. Total utility curve:
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. The moment of inertia of a circular disc of mass M and radius R rotating about an axis passing through its edge and perpendicular to the plane of the disc is
Answer : Option C
Explaination / Solution:
Moment of inertia of a disc about axis passing through Centre of mass and perpendicular to plane
if I = Moment of inertia of a disc about axis passing through its edge and perpendicular to plane
applying parellal axis theorm
Q4. The excess pressure across the surface of a soap bubble of radius r(with σ as the surface tension of soap solution)is
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. Which gas is evolved when urea is treated with NaOH?
Answer : Option A
Explaination / Solution:
Urea on reaction with NaOH liberates ammonia.
Q6. If an osmotic system, one has a water potential of -1000 kPa while the other has -500kPa, which chamber has higher water potential?
Answer : Option A
Explaination / Solution:
Water potential of distilled water is 0. Presence of more solute reduce the water potential. So one having water potential -500 kPa is higher in comparison to one having -1000kPa water potential.
Q7. The most active phagocytic white blood cells are
Answer : Option C
Explaination / Solution:
The most active phagocytic white blood cells are nerutophils and monocytes. These cells try to engulf the microbes that enters the blood to cause disease.
Q8. What type of interaction hold the molecules together in a polar molecular solid?
Answer : Option A
Explaination / Solution:
Polar molecule will act as a dipole.
Q9. The class of fungi in which mushroom is included is
Answer : Option C
Explaination / Solution:
Commonly known forms of basidiomycetes are mushrooms, bracket fungi or puffballs.
Q10. Arrange the following in decreasing order of their boiling points. (A) n–butane (B) 2–methylbutane (C) n-pentane (D) 2,2–dimethylpropane
Answer : Option C
Explaination / Solution:
Boiling point depends on molecular mass and surface area.As the number of carbon atoms increase,boiling point increases ,hence n-butane has the minimum boiling point.Among isomeric alkanes,boiling point decreases with branching.Hence the order.
