General Science - Online Test
Q1. A single strand of nucleic acid tagged with a radioactive molecule is called
Answer : Option C
Explaination / Solution:
A probe is a fragment of DNA or RNA of variable length (usually 100–1000 bases long) which can be radioactively labeled. It can then be used in DNA or RNA samples to detect the presence of nucleotide sequences (the DNA target) that are complementary to the sequence in the probe.
Q2. Figure shows current in a part of an electrical circuit. Then current I is
Answer : Option A
Explaination / Solution:
Using Kirchhoff’s junction rule at junction A,2 + 5 - 2 - 1 + IAB = 0;IAB = - 4A
The current IAB is directed away from the junction A. Using the junction rule at B 4 + 0.2 - 1.7 - I = 0;
I = 2.5A
Q3. The time period of a physical pendulum of mass m and moment of inertia I is given by ( l is length of pendulum and g the acceleration due to gravity)
Answer : Option B
Explaination / Solution:
Torque;,a= angular accleration
so Time period T is :
T = 2π
Q4. The concept of ecological pyramids was developed by :
Answer : Option B
Explaination / Solution:
The concept of ecological pyramid was developed by Charles Elton; these pyramids are also known as Eltonian pyramids. The pyramids are a graphical representation which depicts the number of organisms, biomass and productivity at each trophic level.
Q5. If we have two coherent sources vibrating in phase, then for an arbitrary point P constructive interference is observed whenever the path difference is
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. hydrogen compounds of non-metals are volatile compounds because
Answer : Option C
Explaination / Solution:
Covalent hydrides :They are formed when hydrogen molecule reacts with the p block elements. The most common examples, in this case, are CH4 and NH3. The hydrogen compounds formed with non-metals are also called hydrides. They are covalent and volatile compounds.
Q7. Inbreeding is necessary if you want to evolve a
Answer : Option B
Explaination / Solution:
Pure line is necessary for carrying out breeding programmers. Pure line is obtained by inbreeding plants followed by test crossing until we get homozygous plants for particular traits.
Q8.
magnetic intensity is defined by
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Which of the following is non – ionizable?
Answer : Option A
Explaination / Solution:
In A there is no ion present outside the coordination sphere so it is ionizable.
Q10. Which of the following is a biosphere reserve in eastern Himalayan regions:
Answer : Option D
Explaination / Solution:
The Dihang-Dibang Biosphere Reserve is situated in the districts of West Siang, Upper Siang and Dibang valley of Arunachel Pradesh in eastern Himalayan range. This reserve is almost totally forested, having villages and cultivated lands located on lower slopes and terrace edging the major river systems. The reserve is the last stronghold for many Himalayan species.
