a/r test 2

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: the mRNA attaches itself to the ribosome via its 3' end
R: the mRNA have F-capsular nucleotide and bases of lagging sequence

2.
A: the lateral line system is found in fishes and aquatic larval amphibians
R: lateral line system has receptors which are the clusters of sensory cells derived from ectoderm

3.
A: the regulation of RBC production is accompanied by the kidneys
R: erythropoietin hormone circulates to the red bone marrow, where it increases stem cell mitosis and speeds up development of RBCs

4.
A: the imbalance in concentration of sodium and potassium ions and proteins generates the resting potential
R: to maintain unequal distribution of sodium and potassium, neurons use electrical energy

5.
A: WBCs accumulate at the site of wound by diapedesis
R: it is the squeezing of leucocytes from the endothelium

physics:

1.
A: in an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of oscillation of the balls, when they are in contact
R: energy spent against friction does not follow the law of conservation of energy

2.
A: faraday's laws are consequences of conservation of energy
R: in a purely resistive AC circuit, the current lags behind the emf in phase

3.
A: thin films such as soap bubble show beautiful colours when illuminated by white light
R: it happens due to the interference of light reflected from the upper surface of the thin film

4.
A: we cannot think of a magnetic configuration with three poles
R: a bar magnet does exert a torque on itself due to its own field

5.
A: we use a thick wire in the secondary of a step down transformer to reduce the production of heat
R: when the plane of the armature is parallel to the line of force of magnetic field, the magnitude of the induced emf is maximum

chemistry:

1.
A: during an adiabatic process, heat energy is not exchanged between system and surroundings
R: the temperature of gas increases when it undergoes an adiabatic expansion

2.
A: potassium and cesium are used in photoelectric cells
R: they emit electron on exposure to light

3.
A: physical absorption of molecules take place on surface only
R: in this process, the bonds of the absorbed molecules are broken

4.
A: cuprous ion is colourless while cupric ion is blue in aqueous solution
R: cuprous ion has unpaired electron while cupric ion don't

5.
A: absorption spectrum consists of some bright lines separated by dark lines
R: emission spectrum consists of dark lines

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