Expansion and Contraction

Q.

In bullock carts, the iron rim is usually heated before fixing it to the wooden wheels. This is because after heating iron ___

1. contracts and fits to the wooden wheel

2. first expands and then contracts, thus fitting to the wooden wheel

3. expands and fits to the wooden wheel

4. none of these

Q.

Why does the iron rim to be mounted on a wooden cartwheel have a slightly smaller diameter than the wooden wheel?

Q.

In bullock carts, the iron rim is usually heated before fixing to the wooden wheels.

1. True

2. False

Q.

The iron rim to be mounted on a wooden cartwheel has a slightly smaller diameter than the wooden wheel.

1. True
2. False

Q.

An iron rod is heated. Which of the following statements is incorrect?

1. The rod almost comes to the same size on cooling.

2. The change is reversed.

3. The rod expands.

4. The rod changes its shape and the change cannot be reversed.

Q.

Chanakya on his way home saw a farmer digging the soil. He observed that the digging tool had an iron blade fixed to a wooden handle. He wondered how the iron blade was fixed to the wooden handle even though the iron ring is smaller than the wooden handle. How do you think this was achieved?

1. Heating the iron ring

2. Cooling the iron ring

3. Welding the iron ring

4. Cutting the iron ring

Q. The iron blade has a ring in which the wooden handle is fixed. The ring is slightly smaller in size than the wooden handle.
The ring is heated . When the ring cools it _____ and tightly fits on the handle.

1. contracts
2. evaporates
3. expands
4. condenses

Q.

An iron ring is heated. Which of the following statements is incorrect for the given iron ring?

1. The ring expands

2. The ring comes to the same size upon cooling

3. The shape of the ring changes and the change is irreversible

4. The change occurring in this case is reversible

Q.

Chanakya on his way home saw a farmer digging the soil. He observed that the digging tool had an iron blade fixed to a wooden handle. He wondered how the iron blade gets fixed to a wooden handle even when the iron ring is smaller than a wooden handle. What do you think can be the way to do this?

1. Cooling the iron ring

2. Cutting the iron ring

3. Welding the iron ring

4. Heating the iron ring

Q. During fixing the metal rim on a wooden wheel of a cart, which of the following is used to contract the metal rim?

1. Hot water is poured over the rim.
2. Meal rim is placed in ice bath.
3. Cold water is poured over the rim.
4. Meal rim is placed in steam bath.

Q. In bullock carts, the iron rim is usually heated before fixing to the wooden wheels, because on heating, the iron:

1. does not expand or contract
2. first expands and then contracts, thus fitting to the wooden wheel
3. contracts and fits to the wooden wheel
4. expands and fits to the wooden wheel