General Science - Online Test
Q1. Elements in which apart from 3s and 3p orbitals, 3d orbitals also available for bonding In a number of compounds of these elements there are more than eight valence electrons around the central atom. One such example is
Answer : Option D
Explaination / Solution:
In , S has more than 8 electrons in valence shell.It has 12 electrons in its valence shell.
Q2. A circular coil of radius 10 cm, 500 turns and resistance is placed with its plane perpendicular to the horizontal component of the earth’s magnetic field. It is rotated about its vertical diameter through in 0.25 s. Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth’s magnetic field at the place is
Answer : Option A
Explaination / Solution:
Q3. Photo-electric effect can be explained only by assuming that light
Answer : Option B
Explaination / Solution:
Einstein proposed an explanation of the photoelectric effect using a concept first put forward by Max Planck that light waves consist of tiny bundles or packets of energy known as photons or quanta. When a photon falls on the surface of a metal, the entire photon’s energy is transferred to the electron. A part of this energy is used to remove the electron from the metal atom’s grasp and the rest is given to the ejected electron as kinetic energy. Electrons emitted from underneath the metal surface lose some of the kinetic energy in collisions. But the surface electrons carry all the kinetic energy imparted by the photon and have the maximum kinetic energy.
We can write this mathematically as E = W + Kmax
Q4. Mass destruction of aquatic life will be caused by:
Answer : Option D
Explaination / Solution:
Mass destruction of aquatic life will be caused by broad spectrum pesticides. Broad spectrum pesticides are effective against large number of pests whether useful or harmful. These pesticides reaches to water bodies along with rain water.
Q5. Alkyl halides are insoluble in water
Answer : Option C
Explaination / Solution:
In alkyl halides, there exist dipole-dipole attractions where as in water van der waal's forces or the hydrogen bonding exists.. It is difficuilt for alkyl halides to break these hydrogen bonds, hence making them almost insoluble in water.
Q6. EBCDIC code developed by
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. A known mass of an organic compound is heated with fuming nitric acid in the presence of silver nitrate is:
Answer : Option B
Explaination / Solution:
This is known as carius method.
Q8. When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
Answer : Option B
Explaination / Solution:
The color of solution is due to the presence of ammoniated electron.
Q9. Modulation is
Answer : Option B
Explaination / Solution:
Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. Most radio systems uses frequency modulation (FM) or amplitude modulation (AM) to make the carrier carry the radio broadcast.
Q10. In S= -a+ (1-b) Y, -a represents
Answer : Option D
Explaination / Solution:
No Explaination.
