Author: admin

13. In a closed and well-insulated room, the door of an ordinary running refrigerator is opened and left open for some time. From the time the door is opened, I […]

12. Which of the following operators commute? 𝐴 (𝑓 (𝑥) = [𝑓 (𝑥)]2   𝐵(𝑓 (𝑥)) = 𝑥𝑓(𝑥)    𝐶 (𝑓 (𝑥)) = 𝑑𝑓/𝑑𝑥 a. A commutes with B b. B […]

11. A 20 cm x 30 cm sheet of paper is illuminated by a candle 10 metres away. The total light power falling on it is X. The paper is […]

10. A spinning-top is spun anticlockwise (when seen from above). As the top slows down it starts precessing, i.e. its axis of rotation starts revolving around the vertical. What is […]

9. Four tubes of P32-labelled ATP with a half-life of 30 days are dispensed and stored at four different temperatures (25°C, 4°C, -20°C and -80°C). After 30 days, the residual […]

8. An angle has the following probability distribution: 𝑓 𝜃 = (1 + sin 3𝜃 )/2𝜋. What is the chance that the angle will lie between 0 and 120°? a. […]

7. Two carbon atoms have a non-covalent interaction whose potential energy varies with distance as 𝐸 𝑟 = 32000000/𝑟!” − 729/𝑟!, where r is measured in Angstroms. The equilibrium inter-atomic […]

6. Which of the following exerts a small but measurable effect on the period of a real clock pendulum? X: The amplitude of the pendulum swing. Y: The temperature. Z: […]

5. You wish to measure how tightly an ant can hold on to its substrate. You place an ant of mass 10 mg on a round, rotating platform at a […]

4. In a right-handed Cartesian frame of reference a 180° rotation about the X-axis followed by a 180° rotation about the Y-axis is equivalent to a. an inversion operation through […]