46. The sum of all the angles of a quadrilateral is.
(A) 120°
(B) 180°
(C) 360°
(D) 90°
Answer:
(C) 360°
Explanation:
A quadrilateral can be divided into two triangles by drawing a diagonal. Since the interior angles of one triangle sum to 180°, the interior angles of a quadrilateral sum to 360°.
47. A good and common example for parallel lines is
(A) railway track
(B) spokes in a wheel
(C) the compass in the geometry box
(D) the protractor in the geometry box
Answer:
(A) railway track
Explanation:
Parallel lines are lines in a plane that are always the same distance apart and never intersect. The two steel rails of a straight railway track perfectly illustrate this concept.
48. The sum of the interior angles of a triangle is
(A) equal to the measure of a right angle
(B) equal to the measure of a straight angle
(C) greater than
(D) less than
Answer:
(B) equal to the measure of a straight angle
Explanation:
The sum of the interior angles of any planar triangle is exactly 180°. Geometrically, an angle of 180° forms a straight line, which is known as a straight angle.
49. The difference between the predecessor and the successor of one million is
(A) 1
(B) 2
(C) 1,000,000
(D) 1,000,001
Answer:
(B) 2
Explanation:
Let be any number (e.g., 1,000,000). Its successor is , and its predecessor is . The mathematical difference between them is .
50. ____ hundreds make a crore.
(A) 10,000
(B) 1,00,000
(C) [Missing in source]
(D) 10,00,000
Answer:
(B) 1,00,000
Explanation:
One crore is represented numerically as 1,00,00,000. Dividing this by one hundred (100) gives . Therefore, one lakh (1,00,000) hundreds make a crore.
