a/r test 4

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: diabetes insipidus is marked by excessive urination and too much thirst of water
R: ADH is secreted by posterior lobe of pituitary

2.
A: fish meal is a rich source of protein for livestock
R: fish meal is produced from non edible parts of fish like fins, tail etc

3.
A: chimpanzee is the closest relative of present day humans
R: the banding pattern in the autosome number 3 and 6 are remarkably similar

4.
A: the honey bee queen copulates only once in life
R: it can lay both fertilised and unfertilised eggs

5.
A: photomodulation of flowering is a phytochrome related process
R: active form of phytochrome directly induces floral induction in shoot buds

physics:

1.
A: a larger dry cell has higher emf
R: the emf of a dry cell is proportional to its size

2.
A: a red object appears dark in yellow light
R: the red colour is scattered less

3.
A: in a pressure cooker the water is brought to boil. the cooker is then removed from the stove. now on removing the lid of the pressure cooker, the water starts boiling again
R: the impurities in water bring down its boiling point

4.
A: the true geographic north is found using a compass needle
R: the magnetic meridian of earth is along the axis of rotation of earth

5.
A: photoelectric effect demonstrate the wave nature of light
R: the number of photoelectrons is proportional to frequency of light

chemistry:

1.
A: HClO4 is stronger acid than HClO3
R: oxidation state of Cl is +8 in HClO4 and +5 in HClO3

2.
A: the free gaseous Cr atom has six unpaired electron
R: half filled s orbital have greater stability

3.
A: alcohols are dehydrated to hydrocarbons in the presence of acidic zeolites
R: zeolites are porous catalysts

4.
A: all F-S-F angle in SF4 is less than 180 degrees
R: the lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion

5.
A: effusion rate of N is greater than O
R: molecular size of N is smaller than O

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