General Science - Online Test
Q1. If y(x, t) = a sin (kx + ωt + φ ) represents a wave function then ‘a’ is
Answer : Option A
Explaination / Solution:
In the equation
y(x, t) = a sin (kx + ωt + φ )
the term before trignometric function is called amplitude
Hence a (term before trignometric function) is the amplitude.
Q2. The amount of energy required to break one mole of bonds of a particular type between two atoms in a gaseous state is called
Answer : Option D
Explaination / Solution:
Bond enthalpy, also known as bond energy, is the energy that is needed to break a particular bond in a gaseous compound. The unit that expresses bond enthalpy is kilojoules per mole, or kJ/mol.
Q3. Inheritance of skin colour in human being is an example of
Answer : Option D
Explaination / Solution:
Skin colour in human being is controlled by many genes so it is an example of polygenic inheritance.
Q4. How many step reactions are involved in glycolysis?
Answer : Option A
Explaination / Solution:
Glycolysis is a series of reactions that and extract energy from glucose by splitting it into two three-carbon molecules called pyruvates. Glycolysis is an ancient metabolic pathway, meaning that it evolved long ago, and it is found in the great majority of organisms alive today. Glycolysis has ten steps.
Q5. Among the alkali metals the most abundant are:
Answer : Option B
Explaination / Solution:
Na and K are highly abundant. Constituting 2.5 and 2.4 percent of the Earth's crust respectively the othwe alkali metals are considerably rare.
Q6. Masses of bacteria associated with fungal filaments to form mesh like structures is called
Answer : Option D
Explaination / Solution:
The masses of bacterium associated with fungal filaments to form mess like structure is called flocs. Flocs are used to remove organic wastes from waste water.
Q7. A moving conductor rod is 0.10 m long, and moves with a velocity of 2.5 m/s perpendicular to the magnetic field B of 0.60 T. If the circuit is completed with a resistance of 0.03Ω. Find the motional emf and the induced current.
Answer : Option B
Explaination / Solution:
e = Bvl = 0.60 x 2.5 x 0.1 = 0.15V
Q8. Which of the following organic compound Wohler synthesised from an inorganic compound, ammonium cyanate in the presence of heat:
Answer : Option B
Explaination / Solution:
The reaction can be given as starting with solutions of potassium cyanate and ammonium chloride which are mixed, heated and cooled again to get ammonium cyanate salt which on decomposition gives the urea.
Q9. According to the Einstein’s model stopping potential for a metal having work function ϕ0 is given by
Answer : Option A
Explaination / Solution:
eV0=KmaxKmax=hν−ϕ0eV0=hν−ϕ0V0=(he)ν−ϕ0e
Q10. Oil spills prevent oxygenation of water so they are :
Answer : Option C
Explaination / Solution:
Physical pollution is the introduction of discarded materials into the environment. Physical pollution is what you might refer to as trash and is the direct result of human actions.
In other words, nature does not produce physical pollution because in natural systems, all byproducts or wastes are eventually recycled back into the environment. For example, in nature, a fallen tree will degrade and eventually return nutrients to the soil..
Oil splits over the water bodies is the result of human activities. It prevents the oxygenation of water. It is physical pollutants.
