a/r test 6

in each of the following questions, a statement of assertion is given and a corresponding statement of reason is given just below it. of the statements, mark the correct answer as

a) both A and R are true and R is the correct explanation of A
b) both A and R are true and R is not the correct explanation of A
c) A is true and R is false
d) both A and R are false

biology:

1.
A: transmission of a nerve impulse across a synapse is accomplished by neurotransmitters
R: neurotransmitters are good means to conduct electrical signals through synaptic cleft

2.
A: all terrestrial mammals are air breathers
R: because of terrestrial habitat, they have well developed lungs for air breathing

3.
A: there is no chance of transmission of malaria to a man on the bite of a male anopheles mosquito
R: it carries a non virulent strain of plasmodium

4.
A: thiamin deficiency results in beri beri causing paralysis
R: people eating raw fish may also suffer from paralysis due to deficiency of vitamin B1. cooked fish has no such effect

5.
A: minerals are not biologically active substances
R: some individuals suffer anaemia due to deficiency of copper

physics:

1.
A: a laser beam of 0.2 W can drill holes through a metal sheet whereas a 1000 W torch light cannot
R: the frequency of laser is much higher than torch light

2.
A: virtual images are always erect
R: virtual images are formed by diverging lenses only

3.
A: in series LCR circuit, the resonance is equal and opposite to the capacitive reactance
R: at resonance the inductive reactance is equal and opposite to the capacitive reactance

4.
A: radio waves can be polarised
R: sound waves in air are longitudinal in nature

5.
A: corpuscular theory fails in explaining the velocities of light in air and water
R: according to corpuscular theory light should travel faster in denser media than in rarer media

chemistry:

1.
A: the energy of an electron is largely determined by its principal quantum number
R: n is the measure of most probable distance of finding the electrons around the nucleus

2.
A: the 19th electron in potassium atom enters into the 4s orbital and not 3d
R: n+1 rule is followed for determining the orbitals of lowest energy state

3.
A: for an ideal gas at constant temperature, the product of the pressure and volume is a constant
R: the mean square velocity of the molecules is inversely proportional to mass

4.
A: heat energy is completely transformed to work during isothermal expansion of gas
R: during isothermal process, the changes in internal energy of a gas due to decrease in pressure is nullified by the changes due to increase in volume

5.
A: alkali metals impart colour to the flame
R: their ionisation energies are low

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