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The given diagram represents the plot of a river stream across a town. Water samples are collected from the river from 5 different places P, Q, R, S and T. The BOD of the collected water samples is shown in the following bar diagram.
a. On which of the places (P to T) the highest amount of organic material is released into the river water?
b. Where does a water treatment plant most likely built?


A a - R, b - Between P and Q
B a - S, b - Between Q and T
C a - Q, b - Between R and S
D a - S, b - Between P and R

Select the option in which the odd member is encircled correctly on the basis of habitat.

A
B
C
D

Chaitanya suffers from stomach ache and bad digestion whenever he eats any wheat product whereas his brother Satvik complains of bad vision in dim light. Which of the following holds true regarding them?

A Chaitanya is suffering from vitamin C deficiency and should take more of citrus fruits in his diet.
B Satvik is suffering from iron deficiency and should take more of spinach, apple, etc., in his diet.
C Chaitanya is allergic to wheat products so he should stop taking them to avoid illness caused due to their consumption.
D Satvik is suffering from vitamin B₁ deficiency so he should take more of carrots and papaya.

A cylindrical bar magnet is rotated about its axis as shown in figure. If a wire is connected from the axis and is made to touch the cylindrical surface through a contact, then


AA direct current flows in the ammeter
BNo current flows through the ammeter
CA time varying current flows through the ammeter
DNone of these.

Study the given table.

Rati performed starch and protein test on few food items and tabulated the results as shown below.

Select the tests where her observation was right and she inferred correct result.

A 1 and 2 only
B 2 and 3 only
C 3 and 4 only
D 1 and 4 only

To maintain soil fertility, nutrient replenishment of soil is essential. Common methods of adding nutrients to soil are given in the box below.

P = Field fallow Q = Green manure R = Fertilizers S = Organic wastes

Which of the following statements is incorrect regarding this ?

(A) P is not best suited because it leaves a field economically useless for a year or two.

(B) R increases productivity readily but prove to be environmental hazard in long run.

(C) S can cause spread of diseases due to pathogenic cysts present in it.

All the following statements about instantaneous speed is false except for ______.

(A) Instantaneous speed is, when an object moves with the same speed throughout the journey.

(B) Instantaneous speed is measured in cm³ h^-1.

(C) Instantaneous speed is the average speed over a certain distance.

Read the given statements and select the correct option.
Statement 1 : Mountaineers often encounter the problem of nose bleeding when they reach high altitudes.
Statement 2 : The blood pressure of their body becomes much less than the atmospheric pressure, making the blood vessels burst.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.

The given figure is of human heart with its parts labelled as X, Y and Z. Which of the following correctly ranks the blood pressure in X, Y and Z from the lowest to the highest?


--------Lowest → Highest
AX → Y → Z
BY → X → Z
CZ → X → Y
DZ → Y → X