High Order Thinking Skills (HOTs) - 6 - Class 9 MCQ

P. Let the number be x. Then,  3x+5=17 gives 3x=12 sox=4.
Q. The sum of the angles in a triangle is always 180°.
R. Perimeter of rectangle = 2(length+width)=2(6+4)=20.
S. Let the numbers be  x and  y.  x+y=15 and  x−y=5. Solving, x=10,  y=5.

P. Area of a circle
Q. The median is the middle value, which is 9.
R. The mode is the most frequent value, which is 7.
S. Sum of first 5 natural numbers = 1+2+3+4+5=15.

P. Product of the roots = constant term / coefficient of x²  = 6/1 = 6.
Q. HCF of 18 and 24 is 6.
R. LCM of 4 and 5 is 20.
S. A cube has 6 faces.

P. First 4 prime numbers are 2, 3, 5, and 7. Sum = 17.
Q. Probability of heads in a fair coin = 1/2.
R. A tetrahedron has 6 edges.
S. Sum of interior angles of a polygon with  n sides = (n-2) x 180º,for hexagon  n = 6, so 4 x 180º = 720º

P. Derivative of x²  is 2x.
Q. Integral of 1 is  x+c
R. Slope of the line y=3x+4 is the coefficient of x, which is 3.
S. Value of π to two decimal places is 3.14.

P. Sum of the exterior angles of any polygon is always 360°.
Q. Square root of 49 is 7.
R. Cube root of 27 is 3.
S. A pentagon has 5 vertices.

P. Mean of {2, 4, 6, 8, 10} = (2+4+6+8+10)/5=6.
Q. Median is the middle value, which is 6.
R. Mode is the most frequent value, which is 5.
S. Range = maximum - minimum = 10 - 2 = 8.