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Free download in PDF CBSE class 10 Science Short Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 10 Students.
41
Which of the following is the molecular formula of cyclobutane?
[A]
C4H8
[B]
C4H10
[C]
C4H6
[D]
C4H4
42
The property of self-linkage among identical atoms to form long chain compounds is known as:
[A]
Halogenation
[B]
Catenation
[C]
Isomerisation
[D]
Superposition
43
The I.U.P.A.C name of CH3CH2CH=CH2 is?
[A]
But-1-ene
[B]
Butyne
[C]
3-Butene
[D]
Prop-1-ene
44
Cation is formed when:
[A]
Atom loses electrons
[B]
Atom shares electrons
[C]
Atom gains electrons
[D]
Proton is lost by the atom
Answer: Atom loses electrons
45
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
[A]
The fuel is not burning completely
[B]
The fuel is burning completely
[C]
The food is not cooked completely
[D]
The fuel is wet
Answer: The fuel is not burning completely
46
An element X belongs to the 3rd period and 1st group of the periodic table. What is the number of valence electrons in its atom?
47
Which of the following does not decrease while moving down the group of the periodic table?
[A]
Valence electrons
[B]
Number of shells in the atom
[C]
Atomic radius
[D]
Metallic character
Answer: Valence electrons
48
The elements A, B and C belong to group 2, 14 and 16 respectively, of the periodic table. Which of the two elements will form covalent bonds?
[A]
B and C
[B]
C and A
[C]
A and B
[D]
None of these
49
Which of the following is the atomic number of an element that forms basic oxide?
[A]
19
[B]
15
[C]
18
[D]
17
50
Which of the following elements has 2 shells and both are completely filled?
[A]
Boron
[B]
Helium
[C]
Calcium
[D]
Neon
51
Which group elements are called transition metals?
[A]
Group number 1 to 2
[B]
Group number 13 to 18
[C]
Group number 3 to 12
[D]
Group number 1 to 8
Answer: Group number 3 to 12
52
Element X forms a chloride with the formula 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]
Si
[C]
Na
[D]
Al
53
Which of the following is the most reactive element of the group 17?
[A]
Fluorine
[B]
Magnesium
[C]
Oxygen
[D]
Sodium
54
What is the other name for group 18th elements?
[A]
Halogens
[B]
Noble gases
[C]
Alkali metals
[D]
Alkali earth metals
55
Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?
[A]
F < O < N
[B]
O < N < F
[C]
O < F < N
[D]
N < F < O
56
What happens to the electropositive character of elements on moving from left to right in a periodic table?
[A]
Decreases
[B]
First decreases than increases
[C]
First increases than decreases
[D]
Increase
57
Which of the following forms the basis of the modern periodic table?
[A]
Atomic mass
[B]
Number of nucleons
[C]
Atomic number
[D]
All of these
58
How many periods and groups are present in the periodic table?
[A]
8 periods and 8 groups
[B]
8 periods and 7 groups
[C]
7 periods and 7 groups
[D]
7 periods and 18 groups
Answer: 7 periods and 18 groups
59
Arteries and veins are connected by a network of extremely narrow tubes called:
[A]
Sieve tubes
[B]
Capillaries
[C]
Vena cava
[D]
Valves
60
Which among the following is necessary to carry out the blood coagulation in a cut or wound?
[A]
Platelets
[B]
Red blood cells
[C]
White Blood Cells
[D]
Blood plasma
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