General Science - Online Test
Q1. One of the following is the rarest of all alkaline earth metals
Answer : Option C
Explaination / Solution:
Ra is found in Uranium and thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite so it is rarest of all alkaline earth metals
Q2. Treatment of waste water is done by
Answer : Option C
Explaination / Solution:
Treatment of waste water is done by the heterotrophic microbes naturally present in the sewage. This treatment is carried out in two stages: primary treatment and secondary treatment.
Q3. A rectangular conductor PQRS in which the conductor PQ is free to move is kept in a magnetic field B ,which is perpendicular to the PQRS which lies in a single plane. If the conductor PQ has a length l,moves with a speed v, then induced emf is
Answer : Option B
Explaination / Solution:
e=dϕdt=d(BS)dt=B.dsdt=Bl.dxdt=Blv
Q4. Covalent bonds are formed with other carbon atoms due to
Answer : Option D
Explaination / Solution:
Catenation is the linkage of atoms of the same element into longer chains.Catenation occurs most readily in carbon, which forms covalent bonds with other carbon atoms to form longer chains and structures. This is the reason for the presence of the vast number of organic compounds in nature.
Q5. According to the Einstein’s model minimum energy needed for the electron to escape from a metal surface having work function , the electron is emitted with maximum kinetic energy =
Answer : Option D
Explaination / Solution:
When any photon is incident on a metal surface it gives its total energy to a electron. Some energy(Work Function) is used up in come out from the metal surface and remaining energy is kinetic energy of electron.
Q6. The neurotoxic form of Mercury which can be directly absorbed by fishes :
Answer : Option A
Explaination / Solution:
Mercury discharged into rivers and lakes is changed by bacteria to the neurotoxic form called methyl mercury. The latter is highly poisonous and may be directly absorbed by fish.
From fishes they enter into food chain and to human by bio-magnification.
Q7. Significant figures are
Answer : Option A
Explaination / Solution:
Significant digits are certain digits that have significance or meaning to certain digits in a number . Such digits help scientists to use them with more precise information about measurement and other numeric data. These digits also help them in rounding off very large or very small number
Q8. Finkelstein reaction is
Answer : Option C
Explaination / Solution:
Halide exchange reaction is Finkelstein reaction in which alkyl chloride is converted to alkyl iodide.
Q9. Which of the following is the appropriate format of URL of e-mail?
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. Any physical quantity like temperature can be converted to
Answer : Option A
Explaination / Solution:
An electrical transducer is a device which is capable of converting the physical quantity into a proportional electrical quantity such as voltage or electric current. Hence it converts any quantity to be measured into usable electrical signal. This physical quantity which is to be measured can be pressure, level, temperature, displacement etc. The output which is obtained from the transducer is in the electrical form and is equivalent to the measured quantity. For example, a temprature transducer will convert temperature to an equivalent electrical potential. This output signal can be used to control the physical quantity or display it.moreover this is of two type Digital or Analog electrical signals.
