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

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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