How long does the light from sun take to reach us?

871

---

How is radiocarbon produced in the atmosphere?

998

---

Explain refraction?

901

---

You want to magnetize a metal. How would you do that?

932

---

What is the value of magnetism at the center of earth?

908

---

Explain diffraction?

923

---

What are rectifiers used for?

931

---

Explain big bang theory?

936

---

Explain radio telescopes?

992

---

What do you mean by newton meter?

845

---

What is the weight of automotive oil?

873

---

What is the difficulty in making fusion based nuclear reactors?

908

---

State 'law of machines'?

952

---

In which medium does the sound travel fatest?

935

---

Explain optical telescopes?

910

---