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Properties of three substances X, Y and Z are given below :
X : Heavy and non-magnetic
Y : Light and non-magnetic
Z : Magnetic
If X, Y and Z are of same size and colour then, which of the following can be used to separate these particles from their mixture?

A Handpicking followed by filtration
B Winnowing followed by magnetic separation
C Magnetic separation followed by sieving
D Sublimation followed by distillation

Which two environmental changes usually cause certain animals to migrate?

A Change of season and fewer predators
B Change of season and less food
C Loss of habitat and fewer predators
D Loss of habitat and more food

Option which correctly identifies true (T) and false (F) ones.
(i) The seasonal movement of the complete population of animals from one area to another is termed migration.
(ii) Heavy and solid bones help penguins to swim through water at a speed up to 15 miles per hour.
(iii) Toucans have four clawed toes in each leg, two in front and two at the back.
(iv) Most rainforests lie between the Tropic of Cancer and the Tropic of Capricorn, that is why they are often called as tropical rainforests.

Select the incorrect match.
(i) Mohair - Angora rabbit
(ii) Merino - Vicuna
(iii) Angora wool - Angora goat
(iv) Cashmere - Kashmiri goat

A(i), (ii) and (iii) only
B(ii) only
C(ii) and (iv) only
D(i), (ii), (iii) and (iv)

Following are the different steps carried out in a waste water treatment plant. These steps are arranged in a random fashion. Select the option that arranges these steps in the correct sequence.
(i) Wastewater is passed into sedimentation tank.
(ii) Sludge is decomposed by anaerobic bacteria.
(iii) Wastewater is passed through bar screens.
(iv) Wastewater is passed to grit and sand removal tank.
(v) Solids settle at the bottom and floatable materials are removed by skimmer.
(vi) Aeration of water takes place.
(vii) Disinfection of water by adding chlorine.

A(iii) → (i) → (iv) → (v) → (ii) → (vi) → (vii)
B(iii) → (iv) → (i) → (v) → (ii) → (vi) → (vii)
C(iv) → (vi) → (v) → (iii) → (ii) → (i) → (vii)
D(iv) → (v) → (vii) → (ii) → (vi) → (i) → (iii)

The given statements correspond to which of the following layers of forest?
(i) It is the thickest layer and much of the sunlight and rain is stopped by the thick foliage.
(ii) The trees may be as high as 100 feet.
(iii) The animals found in this layer include birds, monkeys, sloths, lizards, etc.

AEmergent layer
BUnderstorey
CCanopy
DForest floor

Three solutions of different substances P, Q and R gave the following results with different indicators.
Solution P : Turns methyl orange red.
Solution Q : Turns turmeric solution red.
Solution R : Turns phenolphthalein solution pink.
Identify the solutions P, Q and R respectively

AAntacid, soap solution, lemon juice
BBaking soda, shampoo, antacid
CLemon juice, sodium hydroxide, baking soda
DVinegar solution, antacid, lemon juice.

Observe the given experimental setup carefully.

Which of the following statements is/are correct?
1. The nails in flask I will rust because both water and oxygen are available.
2. Nails in flask II will not rust because tap water contains impurities.
3. Nails in flask III will not rust because both oxygen and water are not available.

A2 only
B1 and 3 only
C3 only
DNone of these

Identify W, X and Y in the given figure and select the correct option regarding them.


AY is the chamber where partially chewed food is stored temporarily.
BW is the chamber which is often referred to as true stomach which leads to small intestine.
CX is the chamber where anaerobic bacteria helps in the digestion of cellulose.
DX is the chamber where protein is digested with the help of enzymes.

Soil erosion can be prevented by

AAfforestation
BDeforestation
COvergrazing by animals
DBoth A and B.