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Which of the following is a SI unit of pressure?
Anonymous Quiz
25%
Atmosphere (atm)
68%
Pascal (Pa)
3%
Torr
4%
Bar
The value of the gas constant (R) in SI units is:
Anonymous Quiz
31%
0.0821 L atm/mol K
63%
8.314 J/mol K
3%
1.987 cal/mol K
3%
22.4 L/mol
Which law states that "at constant temperature, the volume of a gas is inversely proportional to its pressure"?
Anonymous Quiz
73%
Boyle's law
18%
Charles' law
4%
Avogadro's law
4%
Gay-Lussac's law
Which of the following has the highest pH?
Anonymous Quiz
23%
Lemon juice
13%
Pure water
47%
Milk of magnesia
17%
Vinegar
Which of the following gases is monatomic?
Anonymous Quiz
4%
Oxygen
4%
Nitrogen
89%
Helium
3%
Carbon dioxide
The second trophic level in a lake is :
Anonymous Quiz
10%
Phytoplankton
81%
Zooplankton
5%
Benthos
4%
Fishes
What is the percentage of PAR used by the plant for photosynthesis?
Anonymous Quiz
4%
100%
20%
50%
20%
1-2%
56%
2-10%
An example of ex situ conservation is :
Anonymous Quiz
17%
Wild life Sanctuary
8%
Sacred Grove
15%
National Park
60%
Seed Bank
Total amount of living substances present in different levels of a chain is showed as:
Anonymous Quiz
20%
Standing state
60%
Standing crop
6%
Standing state or crop
14%
All of the above
The lanthanide contraction is responsible for the fact that
Anonymous Quiz
9%
Zr and Y have about the same radius
6%
Zr and Nb have similar oxidation state
83%
Zr and Hf have about the same radius
2%
Zr and Zn have the same oxidation state
Which of the following is not an actinide
Anonymous Quiz
21%
Curium
22%
Californium
21%
Uranium
36%
Terbium
All the following statements about the transitional elements are true except that
Anonymous Quiz
8%
All of the transitional elements are predominantly metallic
9%
In aqueous solution many of their simple ions are coloured
14%
Most of the transitional elements show pronounced catalytic activity
69%
Most of the transitional elements show only one valence state
Transitional elements exhibit variable valencies because they release electrons from the
following orbits
following orbits
Anonymous Quiz
5%
ns orbit
6%
ns and np orbits
75%
(n-1)d and ns orbits
14%
(n-1) d orbit
Which of the following responsible for death of large numbers of marine animals such as fishes?
Anonymous Quiz
4%
Most of the chrysophytes
2%
Slime moulds
3%
Protozoans
91%
Red dinoflagellates (Gonyaulax)
Which of the following mainly living in stagnant freshwater and instead of a cell wall, they have pellicle ?
Anonymous Quiz
7%
Chrysophytes
11%
Slime moulds
5%
All Protozoans
76%
Euglenoids
Reproduce only by asexual spores known as conidia, mycelium is septate and branched, some members are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling :
Anonymous Quiz
12%
Ascomycetes
11%
Basidiomycetes
71%
Deuteromycetes
6%
Phycomycetes
Which of the following are heterotrophs, live as predators or parasites and believed to be primitive relatives of animals?
Anonymous Quiz
2%
Chrysophytes
77%
Protozoans
17%
Euglenoids
4%
Dinoflagellates