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All the following are ammonotelic except
1. Many bony foshes
2. Aquatic amphibians
3. Aquatic insects
4. Land snails

The blood from the glomerulaus is carried away by
1. Afferent arteriole
2. Efferent arteriole
3. Peritubular capillary network
4. Renal vein

Vasa recta in cortical nephrons:
(1) Arises from afferent arteriole rather that the efferent arteriole
(2) Does not get involved in counter current exchange with loop of Henle
(3) Carries deoxygenated blood rich in urea
(4) Is absent or highly reduced

The proximal convoluted tubule is lined by the:
(1) Simple cuboidal epithelium
(2) Simple columnar epithelium
(3) Simple cuboidal brush bordered epithelium
(4) Simple columnar brush bordered epithelium

During concentration of urine by the human kidneys, NaCl is returned to the medullary interstitium by the:
(1) Descending limb of the loop of Henle
(2) Ascending limb of the loop of Henle
(3) Descending limb of the vasa recta
(4) Ascending limb of the vasa recta

Blood doping means use of banned substances by athletes that have a favorable effect on erythrocyte count by stimulating the bone marrow. The source of such a hormone can be the human:
(1) Spleen
(2) Heart
(3) Kidney
(4) Lungs

The main disadvantage of urea as an excretory product for animals eliminating it would be:
(1) Its high toxicity
(2) Needs lot of water to be eliminated
(3) It being an osmolyte
(4) Energy expenditure to produce it

Match each item in Column l with one in Column ll and choose the correct option from the codes given below.

    A   B   C
1.  b , d , f
2.  a , d , f
3.  a , c , e 
4.  b , d , e

Identify the correct statement regarding the excretion of acids by the human kidney
1. The filtered bicarbonate is absorbed by anion transport
2. The intercalated cells of the distal tubule secrete hydrogen ions to reabsorb bicarbonate from the tubular fluid
3. All of the filtered bicarbonate is normally reabsorbed in the first half of the distal tubule.
4. Urine pH is normally greater than that of plasma

Which of the following statements is correct?
1. Down the Electrochemical Series, reducing power of an element increases and oxidizing power decreases.
2. Down the Electrochemical Series, reduction potential of an element decreases and oxidation potential increases.
3. Most reducing element has lowest reduction potential & highest oxidation potential.
4. If X element is placed above Y in Electrochemical Series, X behaves as cathode & Y behaves as anode

Equivalent weight of ${\mathrm{HNO}}_2$ in the reaction ${\mathrm{HNO}}_2<mspace\; width="1em"></mspace>\to <mspace\; width="1em"></mspace>{\mathrm{HNO}}_3+\mathrm{NO}$
1. 47
2. 23.5
3. 23.5
4. 70.5

n-factor of ${\mathrm{Cl}}_2$ in the reaction
   $<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>{\mathrm{Cl}}_2<mspace\; width="1em"></mspace>\to <mspace\; width="1em"></mspace>{\mathrm{Cl}}^{-}+{\mathrm{ClO}}_3^{-}$
1. 1.67
2. 0.6
3. 0.5
4. 2

Oxidation number of Chromium in ${\mathrm{CrO}}_5$ is
1. +5
2. +6
3. +3
4. +4

Following reaction takes place
$\mathrm{Zn}+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{dil}\right)\to {\mathrm{ZnSO}}_4+{\mathrm{H}}_2$
whereas the following reaction does not take place:
$\mathrm{Cu}+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{dil}\right)\to {\mathrm{CuSO}}_4+{\mathrm{H}}_2$
Correct reason is/are:
1. Elements higher than hydrogen in Electrochemical Series replace hydrogen from its dilute acid solution. Those below it are not able to.
2. Copper is higher than Hydrogen in Electrochemical Series.
3. Zinc is lower than Hydrogen in Electrochemical Series.
4. None of the above.

A cylinder of radius 5 cm and length 20 cm is placed along the x-axis. Electric field function is given as:
$\overrightarrow{\mathrm{E}}=\{$$200\hat{\mathrm{i}}, \mathrm{x}>0$
$-200\hat{\mathrm{i}}, \mathrm{x}<0$
Value of flux, through curved surface area of the cylinder is:

1. 0
2. 1
3. -1
4. 10

A charge 'q' is placed at the center of the cube as shown in the figure. What is the flux through one face of the cube

1. $\frac{\mathrm{q}}{{\mathrm{\epsilon }}_0}$
2. $\frac{\mathrm{q}}{2{\mathrm{\epsilon }}_0}$
3. $\frac{\mathrm{q}}{6{\mathrm{\epsilon }}_0}$
4. $\frac{\mathrm{q}}{4{\mathrm{\epsilon }}_0}$

At what distance from the centre Electric Field Instensity due to ring (of radius R) is max.
1. R
2. R/2
3. $\sqrt{2}/\mathrm{R}$
4. $\mathrm{R}/\sqrt{2}$

How many electrons make 1 Coulomb charge.
1. $6.25\times {10}^{23}$
2. $6.25\times {10}^{18}$
3. $6.25\times {10}^{-23}$
4. $6.25\times {10}^{-18}$

Charge -q is revolving around +Q due to electrostatic force of attraction in a circle of radius 'r'. Time period of revolution is
           
1. $2\mathrm{\pi }\frac{\sqrt{{\mathrm{mr}}^3}}{\mathrm{kQq}}$
2. $4\mathrm{\pi }\frac{\sqrt{{\mathrm{mr}}^3}}{\mathrm{kQq}}$
3. $\mathrm{\pi }\frac{\sqrt{{\mathrm{mr}}^3}}{\mathrm{kQq}}$
4. $4\mathrm{\pi }\frac{\sqrt{{\mathrm{mr}}^2}}{\mathrm{kQq}}$