Page 60 - Ganit Kaushal

21. Where will the hour hand of a clock stop if it starts

(a) from 1 and turns through 3 right angles in the clockwise direction?
(b) from 12 and turns through 2 straight angles? Is it necessary to specify direction here? Why or
why not?

(c) from 10 and turns through 2 right angles in the clockwise direction?

Assertion Reason Type Questions
A statement of assertion (A) is followed by a statement of reason (R). Choose the correct option out of the
choices given below for each question:

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.

(d) A is false but R is true.
1. Assertion (A): In the given figure, l and m are parallel lines, whereas p and
q are intersecting lines.

Reason (R): In the given figure, we can say that the points A, B, and C are
collinear.

2. Assertion (A): A dot made on a sheet of paper with a pencil is the geometrical
representation of a point.
Reason (R): A point has no dimensions. In other words, it has no length, width, or thickness.

3. Assertion (A): The front surface of the green board in the classroom is a part of a plane.
Reason (R): A plane is a flat surface that extends infinitely in all directions with no thickness.

4. Assertion (A): The sum of two obtuse angles is greater than 180 degrees.
Reason (R): The sum of two right angles is a straight angle.
5. Assertion (A): From 8:00 pm to 8:50 pm, the minute hand of a clock covers an angle of 270°.
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Reason (R): × 360° = 300°
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6. Assertion (A): The sum of two right angles and one acute angle is a reflex angle.

Reason (R): 135 degrees is an obtuse angle.

7. Assertion (A): The sum of two obtuse angles is a reflex angle.
Reason (R): A reflex angle is greater than 180 degrees.
8. Assertion (A): Tracks of the railway line are a perfect example of parallel lines.

Reason (R): Parallel lines remain at an equal distance at all places.

58 Mathematics-6