Q6 which of the following are the main effects caused by eutrophication?

i) Species diversity decreases and the dominant biota changes.

ii) Plant and animal biomass increases.

iii) Turbidity decreases.

iv) Rate of sedimentation increases, shortening the lifespan of the lake

Which of the above statements is/are correct?

Q. Which of the following statement(s) is/are correct?
As the s-character of a hybrid orbital decreases,
(I) the bond angle decreases
(II) the bond strength increases
(III) the bond length increases
(IV) the size of orbital increases

Q. In the circuit shown in figure, reading of ammeter will

i) increases if only $S_1$ is closed.
ii) decreases if only $S_1$ is closed.
iii) increases if $S_1$ and $S_2$ are both closed.
iv) decreases if $S_1$ and $S_2$ are both closed.

Which of the above statements is/are correct:

Q. Read the following statements
I) Gamma diversity is the diversity of the entire landscape.
II) species diversity increases as we move away from the equator towards the poles.
III) Genetic diversity decreases with environmental variability.
IV) Western Ghats have a greater amphibian species diversity than the Eastern Ghats
Which among the above are true?

Q.

Parts (a) to (e) refer to changes in the properties of elements on moving from left to right across a period of Periodic Table. For each property, choose the correct answer.

(a) The non-metallic character of the elements :

(i) decreases, (ii) increases,

(iii) remains the same, (iv) depends on the period

(b) The electronegativity :

(i) depends on the number of valence electrons,

(ii) remains the same,

(iii) decreases,

(iv) increases.

(c) The ionization potential :

(i) goes up and down (ii) decreases

(iii) increases (iv) remains the same

(d) The atomic size :

(i) decreases,

(ii) increases,

(iii) remains the same ,

(iv) sometimes increases and sometimes decreases.

(e) The electron affinity of the elements in groups 1 to 7 :

(i) goes up and then down.

(ii) decreases and then increases,

(iii) increases,

(iv) decreases.

Q. Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air ?
(i) increase in pressure
(ii) increase in temperature
(iii) decrease in pressure
(iv) decrease in temperature

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)