NCERT Solutions for Class 4th Maths Chapter 1 Look at the wheels — In-text Questions
Book page 19 Updated on2026-09-19
Q1.
All wheels look like ……………
The four wheels A, B, C and D drawn to the sizes given in the book.
Answer
All wheels look like a circle.
Every point on the rim is the same distance from the middle.
Because of that, a wheel rolls smoothly without bumping up and down.
The wheels differ in size, but every one of them is round.
Why it happens: Only a circle keeps its centre at the same
height while it rolls. A square wheel would lift and drop at every corner, so carts and
cycles must have round wheels.
Q2.
Name the wheel with the 1. longest radius ……................ 2. shortest radius ……................ 3. longest diameter ……................ 4. shortest diameter ……................
The four wheels A, B, C and D drawn to the sizes given in the book.
Answer
Compare the wheels by how wide they are across.
Answer
Reason
1. Longest radius
B
B is the biggest wheel of the four
2. Shortest radius
D
D is the smallest wheel of the four
3. Longest diameter
B
the biggest wheel is widest across too
4. Shortest diameter
D
the smallest wheel is narrowest across too
In order of size: B is the largest, then C, then A, and
D is the smallest.
Why it happens: The diameter is double the radius. So the wheel
with the longest radius must also have the longest diameter, and the wheel with the
shortest radius must have the shortest diameter. The answers for radius and diameter can
never be different wheels.