- A1944, Robin Van de Graff
- B1932, Robert Van de Graff
- C1933, Robin Van de Graff
- D1933, Robert Van de Graff
Explanation:
Van de Graff generator was invented by Robert Jemison Van de Graff on November 28, 1933. Robert Jemison invented the Van de Graff generator, which is a kind of high-voltage electrostatic generator that accelerates particles, while he was doing his PhD in Princeton University.
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X-rays which can penetrate through longer distances in substance are called
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(a) Soft X-rays |
(b) Continuous X-rays |
(c) Hard X-rays |
(d) None of the above |
On a glass plate a light wave is incident at an angle of 60°. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
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(a) |
(b) |
(c) |
(d) |
Which of the following isotopes is normally fissionable ?
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(a) |
(b) |
(c) |
(d) |

A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R, the range is 0-V¢. The correct relation between V and V¢ is
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(a) |
(b) |
(c) |
(d) |
What is the area of the plates of a 3F parallel plate capacitor, if the separation between the plates is 5mm
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(a) 1.694 |
(b) 4.529 |
(c) 9.281 |
(d) 12.981 |