General Science - Online Test
Q1. In the DNA molecule:
Answer : Option C
Explaination / Solution:
In the DNA molecule, there are two strands which run antiparallel one in the 5′→3′direction and other in the 3′→5′.
Two strands are combined by Hydrogen bonds between nitrogenous bases of complementary strands.
Q2. The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance again
Answer : Option D
Explaination / Solution:
The balance point of the Wheatstone’s bridge is determined by the ratio of the resistances. The change in the e m f of the external battery will have no effect on the balance point.
Q3. Molecular formula represents
Answer : Option D
Explaination / Solution:
Molecular formula is the exact no. of atoms present in a molecule of a compound.
Molecular formula of a compound is related with its empirical formula as ,
Mollecular formula = ( Empirical formula ) n
where n represents a positive integer .
Q4. The damped natural frequency of a Damped system is
Answer : Option A
Explaination / Solution:
The damped natural frequency fd is related to the natural frequency fn by a relation
where damping ratio is <= 1
so the fd is less than the natural frequency
Q5. Speed of decomposition will be
Answer : Option B
Explaination / Solution:
In detritus food chain, speed of decomposition will be fast if detritus is rich in simple sugar that can be easily decomposed into glucose by saprophytes that includes bacteria and fungi.
Q6. Many d-block and f-block elements form
Answer : Option B
Explaination / Solution:
Hydrides are formed by many d-block and f-block elements when heated with hydrogen under pressure. The hydrides tend to be non-stoichiometric and they may be of variable composition.These hydrides have properties similar to those of parent metal and hence are known as metallic hydride.
Q7. Referring to the Young’s double slit experiment, if D and d are distance from slit to screen and screen center to point P fringe width is given by
Answer : Option D
Explaination / Solution:
No Explaination.
Q8. Heterosis means
Answer : Option D
Explaination / Solution:
Hybrid vigour is obtained from hybridization between two plants containing desired traits. Hybrid vigour is also called heterosis as it contains genes from different plants.
Q9. For diamagnetic materials
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. When we compare the relationship between species richness and area for wide variety of taxa, the graph appears to be a
Answer : Option B
Explaination / Solution:
- Alexander Von Humboldt has observed that within a region, species richness gets increased when explored area is increased, but only up to a limit.
- The relationship between species richness and area for a number of taxa like angiospermic plants, fresh water fishes and birds is found to be a rectangular hyperbola.
The equation is described by –
log S = log C + Z log A
S – Species Richness
Z – Slope of the line (regression coefficient)
A – Area
C – y-intercept
