## 1. Which instrument is used to draw a circle?

### Answer:

### Explanation:

A compass is used to draw circles and arcs.

## 2. What is the main purpose of a protractor?

### Answer:

### Explanation:

A protractor is used to measure and construct angles.

## 3. Which of the following is essential to construct a unique triangle when three sides are given?

### Answer:

### Explanation:

With the help of a ruler and compass, a unique triangle can be constructed using its three given sides (SSS criterion).

## 4. To construct a 60° angle, which basic construction is required?

### Answer:

### Explanation:

The angles of an equilateral triangle are 60°. Hence, constructing one helps in getting the desired angle.

## 5. Which instrument is NOT typically used for constructions in practical geometry?

### Answer:

### Explanation:

While erasers are handy for corrections, they aren't primarily used for geometrical constructions.

## 6. To bisect a given angle, which instruments are necessary?

### Answer:

### Explanation:

An angle can be bisected using a compass and ruler.

## 7. What is the main purpose of a set-square?

### Answer:

### Explanation:

Set-squares are usually used to draw perpendicular and parallel lines.

## 8. To construct a 90° angle, we can use:

### Answer:

### Explanation:

A 90° angle can be constructed using a compass and ruler, or directly with a set-square.

## 9. The angle bisector of a given angle divides it into:

### Answer:

### Explanation:

An angle bisector divides the given angle into two equal parts.

## 10. A rhombus with a side of 5 cm can be constructed using:

### Answer:

### Explanation:

A rhombus has all sides equal. Therefore, by the SSS criterion, it can be constructed using the given side length.

## 11. Which is NOT a basic construction in practical geometry?

### Answer:

### Explanation:

Drawing an ellipse requires a specific set of tools and isn't considered a basic construction in practical geometry.

## 12. The construction of a triangle with two given sides and the included angle is based on which criterion?

### Answer:

### Explanation:

The SAS criterion involves two sides and the included angle.

## 13. To divide a line segment into a number of equal parts, you would need:

### Answer:

### Explanation:

A line segment can be divided into equal parts using a ruler and compass.

## 14. To construct a parallelogram, which of the following sets of measurements is NOT sufficient?

### Answer:

### Explanation:

Two adjacent angles and a side aren't sufficient to construct a unique parallelogram.

## 15. A line segment is drawn using:

### Answer:

### Explanation:

Line segments are drawn using a ruler.

## 16. A triangle is said to be constructed uniquely if:

### Answer:

### Explanation:

A unique triangle can be constructed if any three of its elements (like SSS, SAS, ASA, or AAS) are given.

## 17. Which of the following can be constructed using only a straightedge?

### Answer:

### Explanation:

A perpendicular bisector can be constructed using only a straightedge if the points where the circle intersects the line segment are marked.

## 18. A right-angled triangle can be constructed uniquely when:

### Answer:

### Explanation:

If one angle (which is 90°) and the hypotenuse are given, a right-angled triangle can be constructed uniquely.

## 19. If a triangle is constructed with two angles and the included side, it follows the:

### Answer:

### Explanation:

Two angles and the included side relate to the ASA criterion.

## 20. To draw a line parallel to a given line through a point, which instrument is crucial?

### Answer:

### Explanation:

A set-square helps in drawing a line parallel to a given line through a specific point.