Centre and Radius

Q. If the diameter of the circle is 14 cm, then the radius of the circle is _____.

1. 5 cm
2. 6 cm
3. 7 cm
4. 8 cm

Q.

A human hair is approximately $0.005\mathrm{mm}$ in diameter. How many hair are required to reach the thickness of $1\mathrm{m}$?

Q.

A circle is a set of points that are at the same distance from a fixed point. The fixed point is called as the ___ of the circle.

1. central

2. radius

3. center

4. diameter

Q.

A point, whose distance from the center of a circle is greater than its radius lies in __________ of the circle.

1. exterior

2. interior

Q.

The line joining the centre of a circle to a point on the circle is called its ________ .

1. diameter
2. chord
3. radius
4. centre

Q.

What is the radius of the largest circle that can be cut out of the rectangle measuring $10\mathrm{cm}$ in length and $8\mathrm{cm}$ in breadth?

1. $4\mathrm{cm}$

2. $5\mathrm{cm}$

3. $8\mathrm{cm}$

4. $10\mathrm{cm}$

Q.

Find the radius of the circle whose diameter is :

$4cm$

Q.

What will be the radius of a circle with diameter 20cm?

1. 10cm
2. 20cm
3. 40cm
4. 60cm

Q.

What will be the radius of a circle of diameter 20cm?

1. 40cm
2. 20cm
3. 60cm
4. 10cm

Q.

If the diameter of the circle is $8cm$, then its radius is

1. $3cm$

2. $4cm$

3. $5cm$

4. $6cm$

Q. If the diameter of the circle is 10 cm, then the radius of the circle is _____.

1. 10 cm
2. 6 cm
3. 5 cm
4. 7 cm

Q.

If radius of a circle is halved then, ________________.

1. Diameter will be doubled
2. Diameter will be same
3. Diameter will be halved
4. Diameter will increase

Q. If we draw 2 straight lines from 2 points on the circle to the centre, then the length of these lines will be .

1. unequal
2. equal
3. almost equal

Q.

If the diameter of the circle is $16cm$, then what will be its radius.

1. $16cm$

2. $10cm$

3. $8cm$

4. None of these

Q.

If diameter of a circle is 18 cm, then the radius is ____ cm.

1. Half of 18

2. 18 + 18

3. $18\times 18$ cm

4. Twice of 18

Q. The circle coloured in ________ has the smallest radius.

1. green
2. red
3. blue
4. yellow

Q.

The diameter of a circle is 10 cm. Its radius is ___.

1. 5 cm

2. 6 cm

3. 20 cm

4. 15 cm

Q.

The diameter of a circle is 15 cm. Its radius is ___

1. 20 cm

2. 30 cm

3. 3 cm

4. 7.5 cm

Q.

Diameter = ___

1. Twice the radius

2. Half of radius

3. One fourth the radius

4. One third the radius

Q.

The distance between the centre and any point on the circle is called the ____.

1. radius

2. diameter

3. circumference

4. arc

Q.

If radius of a circle is halved then, ________________.

1. Diameter will be halved
2. Diameter will increase
3. Diameter will be same
4. Diameter will be doubled