General Science - Online Test
Q1. Pituitary dwarfs will not show :
Answer : Option C
Explaination / Solution:
Pituitary dwarf hormone will show normal intelligence, stunned growth and inhibited growth of long bones. Pituitary dwarfs will no show mental retardation.
Q2. Calculate the standard cell potentials of galvanic cell, and equilibrium constant of the reactions if the reaction is
Answer : Option D
Explaination / Solution:
Q3. Locomotory organ of annelida is
Answer : Option D
Explaination / Solution:
Locomotory organ of annelia is parapodia. Parapodium are in form of lateral fleshy protrusions on the body surface that help in movement and capturing food.
Q4. Barter system is now replaced by
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. The impurity atoms with which pure silicon should be doped to make a p-type semiconductor are those of
Answer : Option A
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. Note each +4 ion is surrounded by four electrons.
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.
A semiconductor doped with an acceptor. An excess hole is now present. Because an acceptor donates excess holes, which are considered to be positively charged, a semiconductor that has been doped with an acceptor is called a p-type semiconductor.
Q6. A firm maximizes its profits only when MR=MC
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. Cost of living index is known as …………
Answer : Option B
Explaination / Solution:
Cost of living Index also known as the Consumer price index (CPI), measures the average change in retail prices.
Q8. Interstitial cells or leydig cells are present between
Answer : Option B
Explaination / Solution:
Leydig cells or interstitial cells are present between seminiferous tubules. Leydig cells secrete testosterone and other androgens hormones in human males.
Q9. The movement started by national literacy mission is
Answer : Option B
Explaination / Solution:
The National Literacy Mission was started by the Government of India in 1988 with an aim to educate all Indians and make India a 100 percent literate country.
Q10. Mid-point is used to calculate the following except
Answer : Option A
Explaination / Solution:
No Explaination.
