NCERT Solutions for Class 4th Maths Chapter 8 Weighing Machines / Let Us Do — In-text Questions

Book page 120 Updated on2026-09-19

Q1.

Do you know the different types of weighing machines used to weigh different objects?

Answer

Yes. Different jobs need different machines.

Weighing machine	Where we see it	What it weighs
Pan balance (tarazu)	Vegetable and grocery shops	Vegetables, daal, rice
Beam balance with weights	Grain shops	Sacks of grain, using 1 kg and 5 kg weights
Digital kitchen scale	Homes and bakeries	Small amounts like 100 g of flour
Bathroom weighing machine	Homes, schools, clinics	The weight of a person
Big platform weighing machine	Warehouses and mandis	Heavy sacks and boxes

Why it happens: A machine must be able to feel the weight it is given. A kitchen scale would break under a sack of grain, and a platform machine would not even notice 10 g of haldi.

Tip: Look at the pictures on page 120 and try to name each machine you have seen in your own market.

Q2.

Ask your parents and find the amount of consumption of the following items at your home in a month.

Items	Weight
Atta
Rice
Pulses
Sugar

Answer

This is the table given in the book:

Items	Weight
Atta
Rice
Pulses
Sugar

Ask at home, then write the weight of each item beside its name.

Sample answer for a family of five:

Items	Weight used in one month
Atta	20 kg
Rice	15 kg
Pulses	4 kg
Sugar	3 kg

20 kg + 15 kg + 4 kg + 3 kg = 42 kg in one month

Why it happens: Atta and rice are eaten at almost every meal, so they are bought in big amounts. Sugar and pulses are used in smaller amounts, so they weigh less.

Tip: Your family’s numbers will be different. A bigger family uses more, and a smaller family uses less. Look at the empty sacks and packets at home to check.

Q3.

Taran and his sister are lifting packets of flour, rice, and salt. What do you think they are experiencing while lifting these packets? Have you ever lifted such packets at your home? What do you experience? Discuss.

Answer

The picture on page 120 shows: Taran and his sister carrying three sacks — one of flour, one of rice and one of salt. Their faces show that the sacks are not easy to hold.

They are feeling that the packets are heavy. Their arms ache, they bend a little, and they can walk only a few steps before putting the sack down.

A sack of atta is often 10 kg
A sack of rice is often 10 kg too
A salt packet is only 1 kg
So the salt packet is the easiest of the three

Sample answer: Yes, I have lifted a 5 kg atta packet at home. I could lift it with both hands, but my arms began to hurt after a short walk. The 1 kg salt packet felt very light after that.

Why it happens: The more kilograms a packet has, the harder our muscles must pull. That pulling is what we feel as ‘heavy’.

Tip: Always lift a heavy packet by bending your knees, not your back.

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