Question : What is the length of the circumference of a circle with centre O and a diameter of 9.8 mm?

Option 1: $4.8 \pi$ mm

Option 2: $9.8 \pi \;$mm

Option 3: $4.9 \pi$ mm

Option 4: $8.8 \pi$ mm

Question : The length of a side of a square inscribed in a circle is $a\sqrt2$ units. The circumference of the circle is:

Option 1: $2\pi a$ units

Option 2: $\pi a$ units

Option 3: $4\pi a$ units

Option 4: $\frac{2a}{\pi}$ units

Question : The ratio of the circumference and diameter of a circle is $22: 7$. If the circumference is $1\frac{4}{7}$ m, then the radius of the circle is:

Option 1: $\frac{1}{3}$ m

Option 2: $\frac{1}{2}$ m

Option 3: $\frac{1}{4}$ m

Option 4: $1$ m

Question : The diameter $PQ$ of a circle with centre $O$ is perpendicular to the chord $RS$. $PQ$ intersects $RS$ at $T$. If $RS=16$ cm and $QT=4$ cm, what is the length (in cm) of the diameter of the circle?

Option 1: 20

Option 2: 48

Option 3: 24

Option 4: 10

Question : O is the centre of a circle with a diameter of 16 cm. Q is a point outside the circle and QS is tangent to the circle at point S. If OQ is =17 cm, what is the length (in cm) of the tangent QS?

Option 1: 15

Option 2: 12

Option 3: 18

Option 4: 10

Question : The circumference of a circle is $58 \pi$ cm. There is a chord XY of length 42 cm in this circle. What is the distance of this chord XY from the centre?

Option 1: 32 cm

Option 2: 20 cm

Option 3: 28 cm

Option 4: 24 cm