answer lies in your question......as war was going on production was increased to produce more commodities fr war....and commodities fr war participants

Reasons for Increased Industrial Production in India during the First World War:
1. Increased Demand:
- The First World War created a huge demand for goods and materials required for the war effort. This resulted in a significant increase in industrial production in India as the British government relied on the country for supplies.
2. Government Support:
- The British government provided support and incentives to Indian industries to boost production during the war. This included subsidies, tax breaks, and other measures to encourage industrial growth.
3. Shift in Focus:
- During the war, the focus shifted from export-oriented industries to those producing goods for the war effort. This led to the expansion of industries such as textiles, steel, and shipbuilding in India.
4. Technological Advancements:
- The First World War saw advancements in technology and machinery, which were also adopted by Indian industries to increase productivity and efficiency. This helped in meeting the increased demand for goods.
5. Opportunities for Indian Entrepreneurs:
- The war created opportunities for Indian entrepreneurs to enter new industries and expand their businesses. This led to the growth of indigenous industries and increased industrial production in the country.
6. Lack of Competition:
- Due to disruptions in trade and industry in other countries involved in the war, Indian industries faced less competition in the global market. This allowed them to increase production and meet the demand for goods.
Overall, the combination of increased demand, government support, technological advancements, and opportunities for Indian entrepreneurs contributed to the growth of industrial production in India during the First World War.