A person rings a metallic bell near a strong concrete wall. He hears the echo after 0.3 s. If the sound moves with a speed of 340 m/s, how far is the wall from him

The synthetic rubber has replaced natural rubber for domestic and industrial purposes. Which one of the following is the main reason behind that

Which of the following statements about India's scientific and research mission in Antarctica is / are correct

1. The first scientific base station in Antarctica was Dakshin Gangotri
2. Dakshin Gangotri is now being used as supply base and transit camp
3. The Maitri station is manned throughout the year for scientific activities

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Which of the following statements regarding chemical industry in India is / are correct

Chemical industry is one of the oldest industries in India

Dyestuff sector is one of the important segments of chemical industry

Textile industry accounts for the largest consumption of dyestuffs

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Which one of the following statements is not correct

Which one of the following statements is not correct