Periodic Classification of Elements class 10 ICSE / CBSE

Periodic Classification

(Q.1)  Three elements that have filled outermost shells are

(a) Li, Na, K                  (b) Cu, Ag, Au     (c) He, Ne, Ar       (d) F, Cl, Br
 

(Q.2)  Elements present in the same period have:

(a) Same number of valence electrons.
(b) Same number of shells in their electronic configurations.
(c) No relation with the electronic configuration.
(d) Same number of electrons.
         

(Q.3)  The element having largest atomic sizein second period is

(a) Lithium           (b) Nitrogen                (c) Oxygen              (d) Carbon
 

(Q.4)  The atom of an element has three shells. There are four electrons in its valence shell. The element is

(a) C           (b) Si          (c) Be          (d) Ar
 

(Q.5)  Valency of an element is determined by

(a) The number of electrons present in the outermost shell.
(b) The total number of electrons present in its atom.
(c) The number of shells in an atom. (d) Total number of electrons and protons.
 

(Q.6)  Mendeleev arranged the elements on the basis of

(a) Similarity in physical properties.    (b) Atomic volume
(c) Atomic Number (d) Increasing order of atomic masses and similarity in chemical properties.
 

(Q.7)  Mendeleev’s periodic law states that the properties of elements are the periodic functions of their

(a) Atomic masses           (b) Atomic numbers   (c) Structure (d) Nucleons
 

(Q.8)  Eka aluminium is now known as

(a) Galium  (b) Germanium  (c) Scandium   (d) Silicon
 

(Q.9)  Limitations of the Mendeleev’s Periodic Table were

(a) There was a fixed position assigned to Hydrogen

(b) Existence of isotopes could be explained

(c) There was the exact prediction of elements to be discovered between two elements.

(d) Metals & non metals were not separately positioned.

(Q.9)  Modern Periodic Table is based on
(a) Density of atom        (b) Atomic volume         (c) Atomic number (d) Atomic mass     (Q.10)  Number of groups in the Modern Periodic Table are
(a) 7            (b) 8            (c) 18          (d) 16  (Q.11)  Number of periods in the Modern Periodic Table are

(a) 7            (b) 18                   (c) 8            (d) 32
 

(Q.12)  Elements present in the same group have

(a) Same number of valence electrons.       (b) Same number of electrons as the group number.
(c) No relation with the valence electrons.(d) Valency equal to the group number.
 

(Q.13)  Whenwe move from Li to Rb

(a) Number of shells increase  (b) Number of shells decrease
(c) Number of shells remain same     (d) Number of electrons decreases
 

(Q.14)  Which of the following statements is false about the trends when going from left to right across the periods of the periodic table?

(a) The elements become less metallic in nature. (b) The number of valence electrons increases.
(c) The atoms lose their electrons more easily.  (d) The oxides become more acidic.
 

(Q.15)  Maximum number of elements in a particular period depends on

(a) How electrons are filled into various shells.             (b) The formula 2n²
(c) Our own convenience                   (d) Average atomic mass
 

(Q.16)  Atomic size / radius
(a) Increases as we move from left to right along a period. (b) Decreases as we move from top to bottom along a group. (c) Decreases till we reach the middle and then start increasing along a period. (d) Decreases as we move from left to right along a period.   (Q.17)  Metallic character of elements

(a) Increases from left to right in a period 

(b) Decreases on moving down the group
(c) Increases on moving down the group

(d) First increases then decreases towards the end on moving from left to right in a period. (Q.18)  Element X forms a chloride XCl2, which is a solid with a high melting point. X would most likely be in the same group of the periodic table as:

(a) Mg         (b) Na         (c) Al          (d) Si
 

(Q.19)  A zig-zag line separates the metals from non-metals almost in the middle of the modern periodic table.The elements placed on borderline are known as
(a) Representative elements     (b) Transition elements  (c) Semi-metals (d) Rare earth elements  (Q.20)  The element having largest atomic size among the following is

(a) Hydrogen        (b) Sodium (c) Cesium  (d) Potassium
 

(Q.21)  By considering their position in the periodic table, which one of the following elements would you expect to have the maximum metallic charecter?

(a) As                   (b) Ge         (c) Ga          (d) Be
 

(Q.22)  Name two elements you would except to show chemical reactions similar to magnesium. What is the base for your choice?
(Q.23)  Oxides of elements of group1are:

(a) Acidic    (b) Basic     (c) Neutral            (d) Amphoteric     

(Q.24)  Which of the following is not a noble gas?

(a) Helium  (b) Fluorine (c) Argon    (d) Neon
 

(Q.25)  How many elements were known when Mendeleev started his work?

(a) 60          (b) 63                   (c) 67    (d) 72
 

(Q.26)  In an atom electrons are arranged in shells. These shells are represented by the symbols:

(a) K, L, M....       (b) A, B, C....       (c) P, Q, R....        (d) X,Y,Z....
 

(Q.28)  Atomic size of atom refers to:

(a) Radius of an atom    (b) Volume of an atom  (c) Surface area of an atom
(d) Density of an atom

(Q.29)  In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d ande (which are not their chemical symbols):

(i)Select the letter which represents a halogen.      

(ii)Select the letter which represents a noble gas.
(iii)What type of bond is formed between a and b                                                                                   (iv)What type of bond is formed between c and d?
(v)Which element will form a divalent anion?

Biology ICSE class 10, Genetics , Absorption by roots, Transpiration and Photosynthesis

1.Fill in the blanks

1.     Water absorbed by surface attraction is called ____________

2.     Inward movement of water in the cell is called ___________

3.     Mineral nutrients required by the plants are absorbed from the soil by _________

4.     The shrinkage of protoplasm is called _________

5.     The solution which has higher concentration of solute than the cell is called _______________.

6.     The bending movement of certain flowers towards the sun is due to ___________

7.     Wood absorbs water by the process of _____________

8.     The  shrinkage of protoplasm takes place when a cell is kept in a _________solution.

9.     __________regulates the opening and closing of stomata.

10.                        Passage of Ions and Minerals from the region of lower concentration to higher concentration is called  _____________

11.                        Root hair is an extension o f ___________

12.                        Due to turgidity gurad cells become more ___________on the outside

13.                        Flaccid and turgid are ___________to each other.

14.                        The shrinkage of protoplasm is called___________

15.                        Phenotype is the observable characteristic which is ___________controlled

16.                        The apparatus used to demonstrate rate of absorption of water by roots is _______

17.                        The plasma membrane of root hairs is ___________

18.                        The pressure controlling the movement of water in and out of the cell is ___________

19.                        In a plasmolysed cell, the gap between cell wall and cell membrane is occupied by ___________.

20.                        Root pressure is caused by ___________

21.                        Active transport is one in which the ions outside the roots is ___________

22.                        The bending movement of certain flowers towards the sun are examples of ___________

23.                        __________pressure in the roots helps them  to push through the hard ground

24.                        Difference in concentration of cells is called___________

25.                        ____________is the  absorption of salts from the region of lower concentration to higher concentration.

A.    Name the following

1.     The tissue which transports starch from leaves to all parts of the plants

2.     A solution whose concentration is greater than the cell sap.

3.     Ground substance present in the chloroplast

4.     Plant with sunken stomata

5.     The phenomenon by which living or dead plant cells absorb water.

6.     Waxy layer on the epidermis of leaf meant to reduce transpiration

7.     The pressure responsible for the movement of water across cortical cells of the roots.

8.     Plant with sunken stomata.

9.     The phenomenon by which living or dead cells absorb water by surface attraction.

10.             Waxy layer on the epidermis of the leaf meant to reduce transpiration.

11.            The principal site in a green leaf for photosynthesis

12.            Two main phases of photosynthesis

13.            The main reaction by which the molecules of water is broken down by means of light.

14.            The main mineral constituent of chlorophyll.

15.            The layer which is present on the upper surface of leaf and helps in photosynthesis.

16.            The chemical form in which food is stored in leucoplast.

17.            The process of formation of ATP molecules during  photosynthesis.

18.            Write the end products of Photolysis.

19.            When leaf plant is kept in dark for long which substance gets removed

20.            Which plastid is found in the leafs of the plant

21.            The organization which suggests quarantine measure to prevent the spread of disease

22.            One combined vaccine given to babies which helps to build immunity against three common diseases.

23.            The process of conversion of ADP to ATP during the first phase of photosynthesis

24.            Name the four nitrogenous base found in a DNA molecule

25.            Vaccine which builds immunity against polio