Tell me why is heavy water used as a moderator?

505

---

Tell me how asteroids are formed?

555

---

Explain what is nucleus?

470

---

Explain what is relation between magnetic and electricity and why?

487

---

Explain what is optical medium?

520

---

Explain the working of basic rubber ink filler

519

---

Explain what is the rectilinear propagation of light?

475

---

Explain what is photometry?

514

---

Tell me when taken to the top of a mountain, a clock will go fast or go slow or no change or stop?

462

---

Explain what is h1n1?

511

---

Explain what is the shadows?

527

---

Explain what is the heterogenous?

508

---

Tell me how we are getting light from electrical bulb?

479

---

Draw a graph between frequency of photon and velocity of photo electron?

500

---

What are the ten satellite launched from india and year of launch?

528

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