Write (T) for true and (F) for false against each of the following statements and fill in the blanks:

Here are the solutions to questions 42 to 47.

42. Write (T) for true and (F) for false against each of the following statements:

• a) Zero is the smallest natural number. Natural numbers are positive integers starting from 1 ($1, 2, 3, \dots$). Zero is not a natural number. ❌ False

• b) The predecessor of $-6$ is $-7$. The predecessor of a number is found by subtracting 1 from it.

  $$-6 - 1 = -7$$

  ✅ True

• c) A ray has two end points. A ray has one starting point and extends infinitely in one direction. ❌ False

• d) Diameter $= \frac{1}{2} \times$ radius. The diameter of a circle or sphere is twice its radius.

  $$\text{Diameter} = 2 \times \text{radius}$$

  ❌ False

43. Fill in the blanks:

• a) The measure of each angle of a convex quadrilateral is $\underline{\text{variable (sum is } 360^\circ\text{)}}$. For a general convex quadrilateral, the measure of each angle can vary, but the sum of all four angles is $360^\circ$. If it refers to a regular convex quadrilateral (a square), then each angle is $90^\circ$. Given the context, "variable (sum is $360^\circ$)" is the most accurate general answer.

• b) A figure which ends at the starting point is called a $\underline{\text{closed figure}}$.

• c) Two lines meeting at a point are called $\underline{\text{intersecting lines}}$.

• d) A $\underline{\text{fraction}}$ is a number representing a part of whole.

44. Observe the bar graph carefully and answer the given questions:

From the bar graph, the heights of the mountain peaks are:

• Nanga Parbat: $8100 \text{ m}$
• Himadri: $7800 \text{ m}$
• Mount Everest: $8800 \text{ m}$
• Nanda Devi: $7800 \text