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The process of forging and casting metals is a ________ change.

AChemical
BPermanent
CPeriodic
DPhysical

Study the given classification chart carefully and identify the incorrect statements regarding the properties U, V, W, X, Y and Z.

I. U refers to 'more dense than water' while Z refers to 'non-edible'.
II. W refers to 'malleability' while V refers to 'hardness'.
III. Y refers to 'more dense than water' while X refers to 'ductility'.
IV. W refers to 'magnetic material' while X refers to 'non-magnetic material'.

AII and III only
BI and III only
CI, III and IV only
DI, II, III and IV

A mixture of two immiscible liquids can be separated by (i) , a mixture of two volatile liquids with a minimum difference of 25°C in boiling points can be separated by (ii) , a soluble solid from water can be separated by (iii) while a mixture of two solids having different sizes can be separated by (iv) .
(i), (ii), (iii) and (iv) could be respectively

ASeparating funnel, boiling, filtration and sieving
BDecantation, evaporation, sieving and winnowing
CSeparating funnel, distillation, evaporation and sieving
DNone of these.

An object O is placed in front of a plane mirror UV as shown in the diagram. A student moves her eyes along the line XY to observe the image of O. Identify the point(s) on the line XY where the image of O can be seen.


Aa, b and c only
Ba, c and d only
Cb and c only
Dd only

Select the option which on unscrambling gives the name of a dark coloured nutrient rich component of soil.

A VRAEGL
B MUUSH
C ANSD
D YLAC

Letters H to M in the given food web represent six animals.

Which of the following is correct regarding this?

A A decrease in population of H will result in an increase in populations of l and L.
B An increase in population of K will result in an increase in populations of l and J.
C A decrease in population of M will result in an increase in populations l and K.
D An increase in population of L will result in a decrease in populations of H and J.

Anita conducted an experiment to calculate the percolation rate of water in different types of soil samples. She took 200 ml water and poured it into three different types of soil samples. She noted the time that was taken by water to percolate through soil. Which of the following graphs correctly shows the relationship between amount of water percolated through different soil samples with respect to time?


A
B
C
D

Which of the following can be obtained by using the letters given in the box? (You can use each letter more than once.)


A A natural disaster that can be measured on Richter scale.
B An enormous water wave that is caused by an earthquake in the ocean floor and creates havoc in coastal areas.
C A strong tropical storm with fast spinning winds.
D Both B and C

The given figure shows three states X, Y and Z in which a matter can exist.

Identify these states and processes (P, Q, R and S) and select the incorrect option regarding them.

AProcess R is responsible for drying of wet clothes when put on clothesline.
BProcess S is responsible for formation of clouds in the atmosphere.
CA naphthalene ball converts from its X state to Y state and vice versa by involving processes P and Q.
DDuring processes P and R, heat energy is used to overcome the force of attraction between the particles.

Select the option which correctly identifies true (T) and false (F) statements.
(i) Ionosphere is a part of troposphere.
(ii) Smoke combines with oxygen to form smog, that affects visibility.
(iii) The ozone layer absorbs harmful UV rays of Sun.
(iv) Clouds, rain, fog and snow are all forms of water.
(v) Air exerts pressure in downward direction only.