What is the shape of your
(i) instrument box      
(ii)  a brick
(iii) a sweet laddoo       
(iv)   a rod-roller

Answer

To determine the shapes of the given objects, we will analyze each one step by step.

### Step-by-Step Solution:

1. **Instrument Box**:
- An instrument box typically has a rectangular shape with length, width, and height.
- This structure resembles a cuboid, which is defined as a three-dimensional shape with six rectangular faces.
- **Conclusion**: The shape of the instrument box is a **cuboid**.

2. **Brick**:
- A brick also has a rectangular shape similar to the instrument box.
- It has length, width, and height, making it another example of a cuboid.
- **Conclusion**: The shape of a brick is a **cuboid**.

3. **Sweet Laddoo**:
- A sweet laddoo is usually round and has no edges or vertices.
- This shape can be described as a sphere, which is defined as a perfectly round three-dimensional shape.
- **Conclusion**: The shape of a sweet laddoo is **spherical**.

4. **Rod Roller**:
- A rod roller is typically long and cylindrical in shape, resembling a tube.
- This structure has circular ends and a curved surface, which is characteristic of a cylinder.
- **Conclusion**: The shape of a rod roller is **cylindrical**.

### Final Answers:
- (i) Instrument Box: **Cuboid**
- (ii) Brick: **Cuboid**
- (iii) Sweet Laddoo: **Spherical**
- (iv) Rod Roller: **Cylindrical**