Test: High Order Thinking Skills - 5 - Class 4 MCQ

• Option A: True. A pentagon has five sides.
• Option B: True. A rectangle has two pairs of equal sides.
• Option C: False. A rhombus has four equal sides, but it does not necessarily have four right angles. Only a square, which is a special type of rhombus, has four right angles.
• Option D: True. The sum of the angles in a triangle is always 180°.

So, the incorrect option is Option C.

• Option A: True. The perimeter of a square is four times the length of one side.
• Option B: True. A circle has infinite lines of symmetry.
• Option C: True. The area of a rectangle is calculated as length times width.
• Option D: False. The circumference of a circle is not twice the radius; it is calculated as 2π times the radius.

So, the incorrect option is Option D.

• Option A: True. An equilateral triangle has all sides of equal length.
• Option B: True. A square is a special type of rhombus where all angles are right angles.
• Option C: False. A parallelogram does not necessarily have four right angles; that is a property of a rectangle or a square.
• Option D: True. The diameter of a circle is the longest chord in a circle.

So, the incorrect option is Option C.

• L.C.M. of 18 and 24 (P):
  • L.C.M. stands for Least Common Multiple.
  • The multiples of 18 are 18, 36, 54, 72, ...
  • The multiples of 24 are 24, 48, 72, ...
  • The smallest common multiple is 72, so P = 72.
• Number of factors of 36 (Q):
  • The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36.
  • There are 9 factors, so Q = 9.
• H.C.F. of 27 and 45 (R):
  • H.C.F. stands for Highest Common Factor.
  • The factors of 27 are 1, 3, 9, 27.
  • The factors of 45 are 1, 3, 5, 9, 15, 45.
  • The highest common factor is 9, so R = 9.

So, the correct answer is Option B: 72, 9, 9.

• L.C.M. of 15 and 20 (P):
  • The multiples of 15 are 15, 30, 45, 60, ...
  • The multiples of 20 are 20, 40, 60, ...
  • The smallest common multiple is 60, so P = 60.
• Number of factors of 28 (Q):
  • The factors of 28 are 1, 2, 4, 7, 14, 28.
  • There are 6 factors, so Q = 6.
• H.C.F. of 14 and 21 (R):
  • The factors of 14 are 1, 2, 7, 14.
  • The factors of 21 are 1, 3, 7, 21.
  • The highest common factor is 7, so R = 7.

So, the correct answer is Option A: 60, 6, 7.

• L.C.M. of 8 and 12 (P):
  • The multiples of 8 are 8, 16, 24, ...
  • The multiples of 12 are 12, 24, 36, ...
  • The smallest common multiple is 24, so P = 24.
• Number of factors of 18 (Q):
  • The factors of 18 are 1, 2, 3, 6, 9, 18.
  • There are 6 factors, so Q = 6.
• H.C.F. of 16 and 24 (R):
  • The factors of 16 are 1, 2, 4, 8, 16.
  • The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24.
  • The highest common factor is 8, so R = 8.

So, the correct answer is Option A: 24, 6, 8.

(a) In 2016, newspaper got maximum subscribers.
(b) Number of newspapers subscribed in 2014 and 2015 together = 350 + 250 = 600
So, required difference = 600 – 250 = 350

Perimeter of figure I = 7 cm + 10 cm + 7 cm + 10 cm = 34 cm
Perimeter of figure II = 5 cm + 10 cm + 9 cm = 24 cm
Perimeter of figure III = 7 cm + 7 cm + 3 cm + 5 cm = 22 cm
As, 22 cm < 24 cm < 34 cm
So, correct ascending order is : III, II, I

Total number of equal parts = 14
Number of shaded parts = 5
So, shaded fraction = 5/14
Total number of equal parts = 14
Number of shaded parts = 7
So, shaded fraction = 7/14

(a) Kesar flavour is liked by exactly 40 students.
(b) Number of students like Rose, Badam and Pista flavours altogether = 20 + 50 + 30 = 100