User Forum

A food chain in an aquarium is shown below.
Water plants → Guppy fish → Angelfish →Snakeheads
If the snakeheads were removed, which graph shows the changes in the population of organisms in the aquarium?

A
B
C
D

Sunita prepared two cups of water (one hot and one cold), and then covered them. Look carefully at the results she obtained after 2 minutes.

Which of the following statements about the results is not true?

(A) Water vapour in the surrounding warmer air condenses on the cold metal cover of the cup containing water.

(B) Water particles from the hot water condense when they meet the cool inner surface of the metal cover.

(C) The insulated sides reduce heat loss or gain from the sides of the cup.

(D) When the heated particles of water vapour present in the air above the hot water hit the cold cover, they lose heat and condense.

Four different-sized beakers are filled with water up to the same height. The temperature of the water is same in all four beakers. If we put 100 gram of ice in each beaker, what effect will occur?


A The water temperature in beaker 2 will change the most.
B The ice will melt fastest in the beaker 3.
C The temperature changes will be same in all four beakers.
D The temperature of the water in beaker 3 will change the most.

(A) Monkey

(B) Sloth

(C) Bat

(D) Gibbon.

A place ‘X’ receives high rainfall but only during a particular season. For the rest of the year, the area remains very dry.

What would you suggest to the citizens living in ‘X’ do to make sure the water remains available throughout the year?

AReduce the wildlife
BConstruct more wells
CStart harvesting rainwater
DReduce the mining activities in the area

Ram and Shyam have performed the experiment to separate sugar from water, as shown in the figures.

Which of the following statements are incorrect?
1.  Method 1 is slower than method 2.
2.  Method 2 leads to the decomposition of sugar to carbon.
3.  Method 1 is more appropriate than method 2.
4.  Method 2 is slow but pure sugar is obtained without getting decomposed.

A2, 3
B1, 2, 3
C3, 4
D2, 4

Which one of the following statements is true?

AA concentrated solution has a small amount of solute dissolved in a large amount of solvent.
BA dilute solution has a small amount of solute dissolved in a small amount of solvent.
CA dilute solution has a small amount of solute dissolved in a large amount of solvent.
DA concentrated solution has a large amount of solute dissolved in a large amount of solvent.

Rohit heated four beakers as shown below :

The correct order of evaporation of water is

AII > I > IV > III
BI > IV > II > III
CIV > I > III > II
DI > II > IV > III

Take boiled potatoes, french fries, raw potatoes, fried potatoes. If you are on a low fat diet, which type of potatoes would you eat?

ABoiled potatoes
BFrench fries
CRaw potatoes
DFried potatoes

Figure shows a measuring cylinder with different levels of water before and after the immersion of an irregular solid object.

The volume of the object is

A 82 cm³
B 12 cm³
C 30 cm³
D 18 cm³