General Science - Online Test
Q1. DNA fingerprinting involves identifying differences in some specific regions of DNA sequence called repetitive DNA because
Answer : Option A
Explaination / Solution:
In specific regions of DNA sequence, a small stretch of DNA is repeated many times. The repetitive DNA are separated from bulk genomic DNA during density gradient centrifugation.
Q2. Amniotic fluid is
Answer : Option B
Explaination / Solution:
The inner foetal membrane invests the embryo and forms a space called amniotic cavity. It is filled with fluid called amniotic fluid. It is useful for studying chromosomal abnormalities of foetus.
Q3. Read the data – It is stated that there are 300 students in art faculty, 400 in commerce faculty and 300 in science faculty .This data represents which characteristics of statistics
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. Which is most easily liquefiable rare gas?
Answer : Option A
Explaination / Solution:
Xe is most easily ( for atmospheric cool air ) liquefiable rare gas.
Q5. What was the most significant trend in the evolution of modern man (Homo sapiens) from his ancestors?
Answer : Option A
Explaination / Solution:
The most significant trend in the evolution of modern man from his ancestors is the increasing cranial cavity. Bony cavity inside which bone is located is called cranium. Cranial capacity increased from 900cc to 1400cc in course of evolution.
Q6. In human beings 99.9% of genome sequence are same in all individuals only 0.1% of genome differ that
Answer : Option B
Explaination / Solution:
Genome variations are differences in the sequence of DNA from one person to the next
In human’s 99.9% of the base sequences of DNA are same & are referred as Bulk genomic DNA.
The difference lies in remaining 0.1%. It is these differences which make every individual unique in their phenotypic appearance. This DNA has small stretches of repetitive sequences. They are referred as Repetitive DNA.
Q7. Haploid nucleus of sperms and a haploid ovum fuse together to form
Answer : Option B
Explaination / Solution:
Haploid nucleus of sperms and a haploid ovum fuse together to form diploid zygote. Zygote undergoes mitotic division to form embryo and fetus.
Q8. 30% rises in prices may due to reduction in supply, shortage of power, rise in wages etc. This shows which characteristics of statistics
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Me3SiCl is used during polymerisation of organo silicones because
Answer : Option B
Explaination / Solution:
the chain length of the polymers can be controlled by adding Me3SiCl which blocks the ends of the chain to produce silicone
Q10. The extinct human who lived 1,00,000 to 40,000 years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating foreheads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was
Answer : Option C
Explaination / Solution:
Neanderthals are recognisably human but have distinctive facial features and a stocky build that were evolutionary adaptations to cold, dry environments.
This species lived between 28,000 and 300,000 years ago.
Key physical features :
- Body size and shape: Neanderthals were generally shorter and had more robust skeletons and muscular bodies than modern humans.
- Brain size was larger than the average modern human brain and averaged 1500 cubic centimetres.
- Skull : distinctive skull shape that was long and low, with a rounded brain case. mid-face region showed a characteristic forward projection (this resulted in a face that looked like it had been ‘pulled’ forward by the nose). orbits (eye sockets) were large and rounded. Nose was broad and very large
- Jaws and teeth : jaws were larger and more robust than those of modern humans and had a gap called the retromolar space, behind the third molars (wisdom teeth) at the back of the jaw. jaw lacked the projecting bony chin that is found in Homo sapiens. teeth were larger than those of modern humans.
