## 1. Which of the following is NOT a quadrilateral?

### Answer:

### Explanation:

A pentagon has five sides, while a quadrilateral has four sides.

## 2. The sum of all interior angles of a quadrilateral is:

### Answer:

### Explanation:

The sum of all interior angles of any quadrilateral is always 360°.

## 3. Which of the following quadrilaterals has only one pair of opposite sides parallel?

### Answer:

### Explanation:

A trapezium is defined as a quadrilateral with exactly one pair of parallel sides.

## 4. A parallelogram with all sides of equal length is called:

### Answer:

### Explanation:

A rhombus is a parallelogram where all four sides are of equal length.

## 5. Which quadrilateral has diagonals that are equal and bisect each other at right angles?

### Answer:

### Explanation:

In a rectangle, the diagonals are equal in length and bisect each other at right angles.

## 6. A quadrilateral with both pairs of opposite sides parallel but not all sides equal is:

### Answer:

### Explanation:

A rectangle has both pairs of opposite sides parallel and opposite sides equal, but all four sides are not necessarily equal.

## 7. In which of the following quadrilaterals are the diagonals perpendicular bisectors of each other?

### Answer:

### Explanation:

In a rhombus, the diagonals are perpendicular bisectors of each other.

## 8. Which quadrilateral has only one line of symmetry?

### Answer:

### Explanation:

A rectangle has only one line of symmetry, which is its median.

## 9. In a kite, the diagonals:

### Answer:

### Explanation:

In a kite, the diagonals are perpendicular to each other.

## 10. A quadrilateral with two distinct pairs of adjacent sides equal is:

### Answer:

### Explanation:

A kite has two distinct pairs of equal adjacent sides.

## 11. In which quadrilateral are opposite angles equal?

### Answer:

### Explanation:

In a parallelogram, opposite angles are always equal.

## 12. Which quadrilateral has all angles equal to 90°?

### Answer:

### Explanation:

Both square and rectangle have all angles equal to 90°.

## 13. The diagonals of which quadrilateral are equal but do not bisect each other at right angles?

### Answer:

### Explanation:

In a general parallelogram, the diagonals are equal but do not bisect each other at right angles.

## 14. Which of the following cannot have all its sides equal?

### Answer:

### Explanation:

A trapezium does not have all sides equal by definition.

## 15. In a quadrilateral, if each pair of opposite angles are equal, then it is a:

### Answer:

### Explanation:

If opposite angles of a quadrilateral are equal, it is a parallelogram.

## 16. In a rhombus, the angle between the diagonals is:

### Answer:

### Explanation:

The diagonals of a rhombus are perpendicular, so the angle between them is 90°.

## 17. A square is a type of:

### Answer:

### Explanation:

A square is both a kite and a parallelogram with special properties.

## 18. The sum of the exterior angles of any polygon is always:

### Answer:

### Explanation:

The sum of the exterior angles of any polygon, taken one at each vertex, is 360°.

## 19. If the diagonals of a quadrilateral bisect each other, then the quadrilateral is:

### Answer:

### Explanation:

If the diagonals of a quadrilateral bisect each other, it is a characteristic property of a parallelogram.

## 20. In a rectangle, if one angle is 90°, then the other three angles are:

### Answer:

### Explanation:

All angles in a rectangle are 90°.