General Science - Online Test
Q1. Which of the following microbes cannot be grown into nutritive media?
Answer : Option B
Explaination / Solution:
Virus cannot be grown into nutritive medium because it lacks all cellular apparatus required for reproduction. It reproduces using cellular apparatus of host cell.
Q2. In acetylene molecule, between the carbon atoms there are
Answer : Option D
Explaination / Solution:
acetylene is C2H2.
C atoms are bound with triple bond i.e. 1 sigma and 2 pie bonds.
Q3. A coil consists of 200 turns of wire having a total resistance of 2.0Ω. Each turn is a square of side 18cm, and a uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.50 T in 0.80 s, Magnitude of the induced emf in the coil while the field is changing is
Answer : Option A
Explaination / Solution:
e=dϕdt
ϕ=NBA
e=200×0.50.8×(18×10−2)2=4.05V
Q4. Part of the electromagnetic spectrum to which 14.4 keV [energy of a particular transition in nucleus associated with a famous high resolution spectroscopic method (Mossbauer spectroscopy)] belongs is
Answer : Option A
Explaination / Solution:
No Explaination.
Q5. Primary constituents of photochemical smog are
Answer : Option A
Explaination / Solution:
Photochemical smog is a mixture of air pollutants which have been chemically altered into further noxious compounds by exposure to sunlight. The main components of photochemical smog are nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate).The smog causes poor visibility on roads and airports.
Q6. A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.
Answer : Option B
Explaination / Solution:
Intramolecular wurtz leading to cyclisaion.
Q7. ........ is internet addressn
Answer : Option B
Explaination / Solution:
No Explaination.
Q8. When and where anaerobic respiration does occurs in man and yeast?
Answer : Option C
Explaination / Solution:
Anaerobic respiration in man occurs in muscle cells during sudden activity in cells to form lactic acid. In yeast anaerobic respiration occurs in absence of oxygen to form ethanol.
Q9. If work function of a metal plate is negligible then the K.E.of the photoelectrons emitted when radiations of 1000 are incident on the metal surface is
Answer : Option A
Explaination / Solution:
No Explaination.
Q10. Alkali metals react with water vigorously to form hydroxides and dihydrogen.Which of the following alkali metals reacts with water least vigorously?
Answer : Option C
Explaination / Solution:
Li reacts with water least vigorously, since the density of Li is only about half that of water,so it floats on the surface and ultimately dissappears,giving off H2 gas
