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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
View Answer
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
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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
View Answer
44
Cation is formed when:
A
Atom loses electrons
B
Atom shares electrons
C
Atom gains electrons
D
Proton is lost by the atom
View Answer
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
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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?
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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
View Answer
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
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49
Which of the following is the atomic number of an element that forms basic oxide?
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50
Which of the following elements has 2 shells and both are completely filled?
A
Boron
B
Helium
C
Calcium
D
Neon
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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
View Answer
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
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53
Which of the following is the most reactive element of the group 17?
A
Fluorine
B
Magnesium
C
Oxygen
D
Sodium
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54
What is the other name for group 18th elements?
A
Halogens
B
Noble gases
C
Alkali metals
D
Alkali earth metals
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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
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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
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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
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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
View Answer
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
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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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