Circles

Q. If the diameter of a circle is 22 cm, what will be its radius?

1. 10 cm
2. 11 cm
3. 12 cm
4. 13 cm

Q.

Which of the following represents a circle?

1. 

2. 

3. 

4. 

Q.

Question 4: Consider the given figure and answer the question:

Is it a curve?

Q.

Every circle has unique centre and it lies inside the circle.

1. True
2. False

Q. Which figure satisfies the same conditions of placement of the dots as given in the figure?

1. 
2. 
3. 
4. 

Q.

Fill in the blanks :

There can be only one ________ of the circle .

Q.

All the points which lie on the semicircle or diameter or inside the semicircle of a circle make up the _____ _____.

Q. The circle has straight sides.

1. no
2. three
3. two

Q.

Question 5
The total surface area of a cone whose radius is $\frac{r}{2}$and slant height 2l is:

A) $2\pi r(l+r)$
B) $\pi r(l+\frac{r}{4})$
C) $\pi r(l+r)$
D) $2\pi rl$​​​​​​​

Q. Mike goes to play at 3:00 p.m. and comes back home 40 minutes later. What would the angle between the hour hand and the minute hand of the clock be once he's back home?
Ignore the angle moved by the hour hand.

1. 45°
2. 150°
3. 90°
4. 180°

Q.

Find the radius of a circle whose diameter measure $8cm$.

Q.

The ratio of base radius to slant height of a right circular cone is 3:2. Calculate the ratio of total surface area of cone to curved surface area of the cone.(Take $\pi =\frac{22}{7}$). [3 MARKS]

Q. Question 3
Curved surface area of a cone is $308c{m}^2$ and its slant height is 14 cm. Find
(i) radius of the base.
(ii) total surface area of the cone. $[Assume\pi =\frac{22}{7}]$

Q. How many right angles do you make if you start facing west and turn to west in clockwise direction?

Q. Let $L$ denote the set of all straight lines in a plane. Let a relation $R$ be defined by $\alpha R\beta \iff \alpha \perp \beta$, $\alpha ,\beta \in L$. Then $R$ is

1. Reflexive
2. Transitive
3. Symmetric
4. None of these

Q. Identify the centre of the circle.

1. 
2. 
3.