General Science - Online Test
Q1. Hybrid vigour is mostly due to
Answer : Option C
Explaination / Solution:
Hybrid vigour is mostly due to heterozygosity of traits. The hybrid contain genome from both the parents that make them more vigorous.
Q2. n the single slit diffraction the screen is at a large distance compared to slit width and θ is the angle by which light has bent.If the size of slit is a.(given that n is not zero)
The condition for maxima is given by
Answer : Option D
Explaination / Solution:
Experimental observation indicates that the intensity has a central maximum at θ = 0 and other secondary maxima at θ = (n+1/2) λ/a, and has minima (zero intensity) at θ =nλ/a, n = ±1, ±2, ±3, ...
Q3.
The angle of dip at a location in southern India is about . Dip angle in Britain would be
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. Wild animals :
i) Frequently breed in Zoos.
ii) Reproductive capacity is lowered if area of free movement is reduced.
i) Frequently breed in Zoos.
ii) Reproductive capacity is lowered if area of free movement is reduced.
Answer : Option D
Explaination / Solution:
Reproductive capacity of an animals is lowered if area of free movement is reduced. So, wild animals do not breed frequently in Zoos. So, statement i is wrong and ii is correct.
Q5. Which of the following ligand gives chelate complexes?
Answer : Option D
Explaination / Solution:
Oxalate is a bidentate ligand.
Q6.
Match the following :
| Column A | Column B |
| a) PTH | i) Mineralocorticoid |
| b) Cortisol | ii) Inhibiting hormone |
| c) Aldosterone | iii)Collip’s hormone |
| d) Somatostatin | iv) Glucocorticoid |
Answer : Option C
Explaination / Solution:
pituitary thyroid hormone is also called as collip’s hormone. Cortisol is called as glucocorticoid hormone. Aldosterone is called as mineralocorticoid and somatostatin is called as inhibiting hormone.
Q7. An electrochemical method is to provide a sacrificial electrode of another metal (like Mg, Zn, etc.) which corrodes itself but saves the object. A typical example is
Answer : Option C
Explaination / Solution:
Galvanization is a process in which iron is coated with reactive metal like Zn which get corroded hence preventing iron from corrosion.
Q8. Which phylum has water vascular system as a characteristic feature?
Answer : Option C
Explaination / Solution:
The most distinctive feature of Echinodermata is the presence of water vascular system.
Q9. M2 includes M1 and
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. A small impurity is added to germanium to get p-type semiconductor. This impurity is a
Answer : Option C
Explaination / Solution:
In a pure (intrinsic) Si or Ge semiconductor, each nucleus uses its four valence electrons to form four covalent bonds with its neighbors. Each ionic core, consisting of the nucleus and non-valent electrons, has a net charge of +4, and is surrounded by 4 valence electrons. Since there are no excess electrons or holes In this case, the number of electrons and holes present at any given time will always be equal.
Now, if one of the atoms in the semiconductor lattice is replaced by an element with three valence electrons, such as a Group 3 element like Boron (B) or Gallium (Ga), the electron-hole balance will be changed. This impurity will only be able to contribute three valence electrons to the lattice, therefore leaving one excess hole. Since holes will "accept" free electrons, a Group 3 impurity is also called an acceptor.
