CBSE class 10 Science Quiz | CBSE class 10 Science Short Questions & Answers

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Questions
41 Which of the following is the molecular formula of cyclobutane?
A C4H8
B C4H10
C C4H6
D C4H4

Answer: C4H8
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

Answer: Catenation
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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

Answer: But-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?
A 8
B 1
C 3
D 6

Answer: 1
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

Answer: B and C
49 Which of the following is the atomic number of an element that forms basic oxide?
A 19
B 15
C 18
D 17

Answer: 19
50 Which of the following elements has 2 shells and both are completely filled?
A Boron
B Helium
C Calcium
D Neon

Answer: 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

Answer: Mg
53 Which of the following is the most reactive element of the group 17?
A Fluorine
B Magnesium
C Oxygen
D Sodium

Answer: Fluorine
54 What is the other name for group 18th elements?
A Halogens
B Noble gases
C Alkali metals
D Alkali earth metals

Answer: Noble gases
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

Answer: F < O < N
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

Answer: Decreases
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

Answer: Atomic number
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

Answer: Capillaries
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

Answer: Platelets

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