If a pendulum is allowed to oscillate in vacuum, its time period will _____.
1). Decreases
2). Increases
3). Remain same
4). first increases and then decreases
2. Which of the following planet is also known as 'Earth's twin'?
4. Who is the author of the book 'Conquest of Self?
5. Which of the following services is NOT provided by the post offices in India?
7. Which of the following is NOT a nucleon?
8. Exchange of gases in lungs takes place in?
10. Which of the following elements has the highest electrical conductivity?