Practice test paper for 10th standard
Practice test paper for 10th standard1. According to modern periodic law the elements were arranged in the periodic table in order of:
a) increasing atomic masses
b) increasing atomic numbers
c) decreasing atomic masses
d) decreasing atomic numbers
Answer
Answer: (b) increasing atomic numbers
2. According to mendeleev periodic law the elements were arranged in the periodic table in the order of:
a) increasing atomic masses
b) increasing atomic numbers
c) decreasing atomic masses
d) decreasing atomic numbers
Answer
Answer: (a) increasing atomic masses
3. Newlands law of octaves was applicable only upto the element:
a) calcium
b) potassium
c) Cobalt
d) phosphorus
Answer
Answer: (a) calcium
4. Mendeleev in his periodic table did not left gap for one of the following element which is:
a) germanium
b) beryllium
c) gallium
d) scandium
Answer
Answer: (b) beryllium
5. The correct statement about modern periodic table is:
a) it has 7 vertical columns called periods
b) it has 7 horizontal rows called groups
c) it has 18 vertical columns called groups
d) it has a 3 horizontal rows called periods
Answer
Answer: (c) 18 vertical columns called groups
6. Among the following which is not a dobereiner triad:
a)Li,Na,K
b)Ca,Sr,Ba
c)Cl,Br,I
d)Be,Mg,Cr
Answer
Answer: (d) Be,Mg,Cr
7. The atomic number of an element is 20.In modern periodic table this element is placed in:
a)2nd group
b)4th group
c)3rd group
d)1st group
Answer
Answer: (a) 2nd group
8. Which element will lose an electron easily?
a)Mg
b)Na
c)K
d)Ca
Answer
Answer: (b) Na
9. The correct increasing order of the atomic radii of the element Oxygen,fluorine and nitrogen is:
a)O,F,N
b)N,F,O
c)O,N,F
d)F,O,N
Answer
Answer: (d) F,O,N
10. Five elements a,b,c,d and e have atomic numbers of 2,3,7,10 and 18 respectively.The elements which belong to the same period of the periodic table are:
a)A,B,C
b)B,C,D
c)A,D,E
d)B,D,E
Answer
Answer: (b) B,C,D
11. Which of the following statements is not a correct statement 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 atom lose their electrons more easily
d) the oxides become more acidic
Answer
Answer: (c) the atom lose their electrons more easily
12. Which of the following element does not lose an electron easily?
a)Na
b)F
c)Mg
d)Al
Answer
Answer: (b) F
13. The atomic numbers of the element Na,Mg,K and Ca are 11,12, 19 and 20 respectively. The element having the largest atomic radius is:
a)Mg
b)Na
c)K
d)Ca
Answer
Answer: (c) K
14. On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
a) increases
b) decreases
c) remains the same
d) first increases then decreases
Answer
Answer: (b) decreases
15. Which one of the following does not increase while moving down the group of the periodic table?
a) atomic radius
b) metallic character
c) valence electrons
d) shells in the atoms
Answer
Answer: (c) valence electrons
16. What happens to the metallic character on moving down the group:
a) increases
b) decreases
c) remains the same
d) none of the above
Answer
Answer: (a) increases
17. What happens to the non metallic character while moving from left to right in the periodic table:
a) increases
b) decreases
c) remains the same
d) none of the above
Answer
Answer: (a) increases
18. How many elements does mendeleev predicted and left gaps for those elements:
a)1
b)2
c)3
d)4
Answer
Answer: (c) 3
19. Group 1 elements and group 17 elements in the periodic table are known as:
a) alkali and alkaline earth metals
b) alkali and noble gases
c) alkali and halogens
d) alkaline and halogens
Answer
Answer: (c) alkali and halogens
20. If number of valence electron is 5 then group number is:
a)13
b)14
c)15
d)16
Answer
Answer: (c) 15
ANSWERS
1. b) increasing atomic number
2. a) increasing atomic masses
3. a) calcium
4. b) beryllium
5. c) 18 vertical columns called groups
6. d)Be,Mg,Cr
7. a)2nd group
8. b)Na
9. d)F,O,N
10. b)B,C,D
11. c) the atoms lose their electrons more easily
12. b)F
13. c)K
14. b) decreases
15. c) valence electrons
16. a) increases
17. a) increases
18. c)3
19. c) alkali and halogens
20. c)15
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