General Science - Online Test
Q1. Which of the following is the long term result of global warming ?
Answer : Option B
Explaination / Solution:
Some of the long term results of global warming are as follows:
- Melting of polar ice with a resulting rise in sea level and coastal flooding.
- Extinction of species as ecological niches disappear.
- More frequent tropical storms and
- An increased incidence of tropical diseases.
Q2. Which statement is not correct about the DNA?
Answer : Option B
Explaination / Solution:
DNA content is halved during meiosis cell division and not during mitosis cell division. Chromosome is made of DNA protein and same amount of DNA is present in all cells of an individual.
Q3. A battery is connected with a potentiometer wire. The internal resistance of the battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then
Answer : Option B
Explaination / Solution:
Potential gradient Is given by V/l. If V and l are constant, the potential gradient also remains constant. The change in the radius will cause a change in the current. This does not change the potential gradient.
Q4. The time period T of a spring system of mass m and spring constant k is given by
Answer : Option D
Explaination / Solution:
If the restoring force of a vibrating or oscillatory system is proportional to the displacement
of the body from its equilibrium position and is directed opposite to the direction of displacement,
the motion of the system is simple harmonic and it is given by
where A, the maximum value of the displacement, is called the amplitude of the motion. If
T is the time for one complete oscillation, then
x(t + T) = x(t)
or
As angular frequency is given by and
Then,time period of oscillation of mass m is given by
Q5. Correct sequence for decomposition process is:
Answer : Option B
Explaination / Solution:
Decomposition process involves fragmentation, leaching, catabolism and mineralization in sequence. Decomposition is essential form nutrient cycles in the ecosystem.
Q6. Two sources of light are coherent if they have
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. Dihydrogen is used in fuel cells for generating electrical energy because
Answer : Option C
Explaination / Solution:
The fuel cell was invented in 1839 by Welsh lawyer Sir William Robert Grove. It takes in Hydrogen and Oxygen from the air and puts out electricity, heat, and water. It doesn't use fossil fuels and it doesn't produce greenhouse gases and so it should be the ideal solution to providing distributed or portable electrical power.
Q8. Cutting of anthers from the bisexual flowers of female parents is called
Answer : Option B
Explaination / Solution:
Emasculation is the technique of removing anther from bisexual flower to prevent self-pollination. The stigma is further covered with butter paper to prevent air born pollination.
Q9. In which of the following compounds the oxidation state of the nickel atom is 0?
Answer : Option A
Explaination / Solution:
CO is neutral ligand so Ni has 0 oxidation state.
Q10. considering the magnetic field of the earth,the correct relation of the geographic pole and the magnetic poles is
Answer : Option A
Explaination / Solution:
No Explaination.
