One of the special characters of coelenterata only is the occurrence of (1994)
Anonymous Quiz
18%
Polymorphism
27%
Flame cells
21%
Hermaphroditism
33%
Nematocysts
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Which one of the following statements is correct? (Karnataka NEET 2013)
Anonymous Quiz
47%
Cleistogamous flowers are always autogamous
20%
Xenogamy occurs only by wind pollination
18%
Chasmogamous flowers do not open at all
14%
Geitonogamy involves the pollen and stigma of flowers of different plants
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Three vectors satisfy the relation A . B = 0 and A . C = 0, then A is parallel to
Anonymous Quiz
35%
BxC
42%
B.C
16%
C
7%
B
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Is the work required to be done by an external force on an object on a frictionless, horizontal surface to accelerate it from a speed v to a speed 2v
Anonymous Quiz
31%
equal to the work required to accelerate the object from t = 0 to v
35%
twice the work required to accelerate the object from v = 0 to v
25%
three times the work required to accelerate the object from v = 0 to v
9%
four times the work required to accelerate the object from 0 to v, or
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How much effort goes into moving a charge of 9C between two sites with a potential difference of 19 V?
Anonymous Quiz
14%
65 J
27%
45 J
21%
40 J
38%
171 J
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Which metal is used in the heating element of an electric heater?
Anonymous Quiz
51%
Nichrome
18%
Silver
19%
Lead
13%
Chromium
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When the potential difference and current across a circuit are both doubled, the circuit's resistance:
Anonymous Quiz
18%
Enhances
26%
Returns to zero
46%
Does not change
10%
Reduces
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