सौर सेलों (बैटरियों) में मुख्य रूप से प्रयुक्त होने वाले पदार्थ में क्या होता है?

Mahatma Gandhi's last fast unto death in 1948 was primarily against which of the following?

What was the primary meaning of 'Swaraj' as popularized by Mahatma Gandhi during India's independence movement?

What was one major impact of India’s independence on its economy?