CBSE Class 7 Mathematics Number Play MCQs Set D

Question. Which set of side lengths cannot form a triangle?
(a) 3 cm, 4 cm, 5 cm
(b) 3 cm, 4 cm, 8 cm
(c) 4 cm, 4 cm, 6 cm
(d) 3.5 cm, 3.5 cm, 3.5 cm

Answer: B

Question. The expression that gives the nth odd number is what expression?
(a) 4n
(b) 2n
(c) 2n - 1
(d) n - 1

Answer: C

Question. Which expression will always result in an odd number, for any whole number value of n?
(a) 2n + 4
(b) 100n
(c) 4n - 1
(d) 6n

Answer: C

Question. What is the value of the 100th even number in the counting sequence?
(a) 100
(b) 199
(c) 200
(d) 50

Answer: C

Question. What is the value of the 100th odd number in the counting sequence?
(a) 200
(b) 100
(c) 199
(d) 201

Answer: C

Question. What is the triangle inequality rule for side lengths a, b, and c?
(a) a + b < c
(b) a + b > c
(c) a + b = c
(d) a + b ≤ c

Answer: B

Question. In a 3 x 3 grid using numbers 1 to 9 without repetition, what is the smallest sum possible for any single row or single column?
(a) 1
(b) 6
(c) 9
(d) 24

Answer: B

Question. In a 3 x 3 grid using numbers 1 to 9 without repetition, what is the largest sum possible for any single row or single column?
(a) 27
(b) 9
(c) 24
(d) 15

Answer: C

Question. For a 3 x 3 grid filled with numbers 1 to 9 without repetition, the sum of all three row sums is always what value?
(a) 90
(b) 45
(c) 15
(d) 24

Answer: B

Question. What is a square grid called if each row, each column, and each diagonal adds up to the same number?
(a) Row square
(b) Sum square
(c) Magic square
(d) Diagonal box

Answer: C

Question. For side lengths 10 cm, 15 cm, and 30 cm, why can't a triangle be formed?
(a) 10 + 15 > 30
(b) 10 + 15 < 30
(c) 10 + 15 = 30
(d) 10 + 30 > 15

Answer: B

Question. In a 3 x 3 magic square using numbers 1-9, the magic sum for each line must be what number?
(a) 45
(b) 9
(c) 15
(d) 10

Answer: C

Question. In a 3 x 3 magic square using numbers 1-9, the number 9 cannot be placed at the center position. Why is this?
(a) Magic sum is too small
(b) Magic sum is too big
(c) The number 8 cannot be placed nearby
(d) 9 is the largest number

Answer: A

Question. Which number must be exactly at the center of a 3 x 3 magic square, if we use numbers 1 to 9?
(a) 1
(b) 9
(c) 5
(d) 15

Answer: C

Question. The numbers 1 and 9 cannot occur in which position in a 3 x 3 magic square (1-9)?
(a) The center
(b) The middle sides
(c) Any corner
(d) The bottom row

Answer: C

Question. Which set of side lengths satisfies the triangle inequality?
(a) 2 cm, 3 cm, 6 cm
(b) 3 cm, 4 cm, 8 cm
(c) cm, 5 cm, 8 cm
(d) 10 cm, 15 cm, 30 cm

Answer: C

Question. If you take a magic square and increase every number in it by 1, the resulting grid will be what?
(a) Still a magic square
(b) Not a magic square
(c) Only sometimes a magic square
(d) Magic sum becomes zero

Answer: A

Question. If you double every number in a magic square, the new magic sum is how related to the old magic sum?
(a) It increases by 2
(b) It decreases by 2
(c) It is multiplied by 2
(d) It stays the same

Answer: C

Question. In a generalized 3 x 3 magic square, if 'm' is the number in the center, the expression for the sum of any row, column, or diagonal is?
(a) m + 15
(b) m x 3
(c) m + m + m
(d) 3m

Answer: D

Question. The sequence of numbers 1, 2, 3, 5, 8, 13, 21, 34, ... is known in India as what sequence?
(a) Fibonacci sequence
(b) Virahanka sequence
(c) Prime sequence
(d) Counting sequence

Answer: B