General Science - Online Test
Q1. Aniline does not undergo one of the following
Answer : Option C
Explaination / Solution:
Because of lot of electron density on N of N H 2.
Q2. The electric field between the plates of a fully charged capacitor is E. If a material of dielectric constant k is introduced between the plates, the electric field at a point between the plates
Answer : Option C
Explaination / Solution:
The capacitance C of a capacitor becomes KC when a dielectric is introduced. ;A fully charged capacitor is the capacitor which is charged and then disconnected from the battery. The charge therefore remains constant, The potential reduces to.The electric field therefore becomes
Q3.
How many molecules of H2O are there in 18g of water?
(Hint: Avagadro’s Number = 6.02 x 1023 atoms/mol)
Answer : Option D
Explaination / Solution:
Since , the number of molecules contained in one mole of a substance
= Avogadro's number (N)
= 6.022 x 1023 molecules ,
and , gram molar mass of water
= 18 g
18g H2O = 1mol water
one mol of water would contain
= 6.022 x 1023 molecules of water
Q4. The sun releases energy coming from
Answer : Option B
Explaination / Solution:
In addition to intense heat, there is an incredible amount of pressure at the Sun's core. In fact, the vast amounts of hydrogen atoms in the Sun's core are compressed and heated so much that they fuse together.
This reaction, known as nuclear fusion, converts hydrogen atoms into helium. The by-product of nuclear fusion in the Sun's core is a massive volume of energy that gets released and radiates outward toward the surface of the Sun and then into the solar system beyond it.
Q5. Which of the following will have inelastic demand?
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. A ring of radius r and mass m rotates about its central axis. The kinetic energy is
Answer : Option C
Explaination / Solution:
Q7. An air bubble of radius r is formed inside a tank of water of depth h. The atmospheric pressure is equal to a water column of height H. the pressure inside the bubble is
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. does not have proton but still acts as an acid and reacts with NH3. Why is it so? What type of bond is formed between the two?
Answer : Option B
Explaination / Solution:
is a Lewis acid as B has its vacant p orbital and coordinate bond is formed as donates its lp of electrons to the vacant orbital of B.
Q9. Mature erythrocytes cannot utilise glucose because they lack
Answer : Option D
Explaination / Solution:
Mature erythrocytes or red blood corpuscles cannot utilize glucose because these cells lack mitochondria as well as nucleus. Though glycolysis or glucose breakdown occurs in the cytoplasm, the final breakdown of pyruvate takes place inside mitochondria. Also the electron transport chain is located inside mitochondria. Hence presence of mitochondria is essential for a cell to utilize glucose and release energy.
Q10. The outer protein covering of virus is
Answer : Option C
Explaination / Solution:
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. The capsid encloses the genetic material of the virus.
