General Science - Online Test
Q1. A Wheatstone bridge is balanced for four resistors R1, R2, R3 and R4 with a Lech lanche cell between A and C and a galvanometer between B and D. The positions of the cell and the galvanometer are interchanged. The balance will
Answer : Option A
Explaination / Solution:
The balance point will not change .
For balancing of wheatstone bridge four arms of resistors are responsible. Interchange the position of galvanometer and cell does not affect balancing of wheatstone bridge.
Q2. At resonance conditons when the forced vibrations frequency matches the natural frequency of the system, amplitude __________________ the natural frequency of the oscillator.
Answer : Option C
Explaination / Solution:
When the mass and spring have no external force acting on them they transfer energy back and forth at a rate equal to the natural frequency. In other words, to efficiently pump energy into both mass and spring requires that the energy source feed the energy in at a rate equal to the natural frequency. Applying a force to the mass and spring is similar to pushing a child on swing, a push is needed at the correct moment to make the swing get higher and higher. As in the case of the swing, the force applied need not be high to get large motions, but must just add energy to the system.
The damper, instead of storing energy, dissipates energy. Since the damping force is proportional to the velocity, the more the motion, the more the damper dissipates the energy. Therefore, there is a point when the energy dissipated by the damper equals the energy added by the force. At this point, the system has reached its maximum amplitude and will continue to vibrate at this level as long as the force applied stays the same. If no damping exists, there is nothing to dissipate the energy and, theoretically, the motion will continue to grow into infinity.
Q3. The more fundamental type of ecological pyramid showing the quantitative relationships of the standing crops will be
Answer : Option C
Explaination / Solution:
The pyramid of biomass is more fundamental, they represent the quantitative relationships of the standing crops.
In this pyramid there is a gradual decrease in the biomass from the producers to the higher trophic levels. The biomass here the net organisms collected from each feeding level and are then dried and weighed.
This dry weight is the biomass and it represents the amount of energy available in the form of organic matter of the organisms. In this pyramid the net dry weight is plotted to that of the producers, herbivores, carnivores, etc. More the number of crop plants higher the biomass.
Q4. Molarity is defined as,
Answer : Option C
Explaination / Solution:
Molarity is the most widely used method of expressing the strength or concentration of a solution .
It is denoted by ' M ' .
Molarity is defined as number of . of moles of solute present per litre of solution.
Mathematically ,
Molarity ( M )
= Number of moles of solute / Volume of solution in Litres
Q5. Presence of extensive hydrogen bonding between water molecules is responsible for
Answer : Option A
Explaination / Solution:
hydrogen bonding is responsible for liquid and solid states.
Q6. "Jaya" and "Ratna" developed for green revolution in India are the varieties of
Answer : Option D
Explaination / Solution:
Jaya and Ratna are varieties of maize developed by Indian council of agricultural research. These varieties are high yielding and resistance to disease.
Q7. Diffraction also refers to
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. In Ferromagnetic materials
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Endemics of western Ghats include
Answer : Option C
Explaination / Solution:
Endemism is the ecological state of a species being unique to a defined geographic location, such as an island, nation, country or other defined zone, or habitat type.
Notable endemics are the Nilgiri leaf monkey and the brown and carmine Beddome's toad of the Western Ghats.
Q10. In which of the following complexes, the nickel metal is in the highest oxidation state?
Answer : Option C
Explaination / Solution:
In A Ni has +4 oxidation state.
