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- Question
In which decade were the first successful diode and triode vacuum tubes invented?
Options- A. 1800s
- B. 1880s
- C. 1890s
- D. 1900s
- Correct Answer
- 1900s
ExplanationIn 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve', which is a diode rectifier. In 1906, Lee de Forest invented the audion later called the triode, which provided signal amplification. - 1. The transverse, longitudinal and surface waves in an earthquake originate from
Options- A. the epicentre within the body of the earth
- B. the focus on the surface of the earth
- C. the focus within the body of the earth
- D. the epicentre on the body of the earth Discuss
- 2. The iron ore mined at Bailadila is mostly
Options- A. haematite
- B. siderite
- C. limonite
- D. magnetic Discuss
- 3. The term yavanika meant
Options- A. foreign goods
- B. dancer
- C. curtain
- D. theatre Discuss
- 4. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
Options- A. p-electrons in Ne(Z = 10)
- B. s-electrons in Mg(Z = 12)
- C. d-electrons in Fe(Z = 26)
- D. p-electrons in CI(Z = 17) Discuss
- 5. Which of the following is a military alliance?
Options- A. NATO
- B. NAFTA
- C. EEC
- D. ASEAN Discuss
- 6. Mesons are found in
Options- A. Laser beam
- B. X-rays
- C. Gamma rays
- D. Cosmic rays Discuss
- 7. The monetary currency of Greece is called (prior to Jan 1, 2002).
Options- A. guilder
- B. drachma
- C. yen
- D. dinar Discuss
- 8. The wavelength of X-rays is of the order of
Options- A. 10 micron
- B. 1 angstrom
- C. 1 cm
- D. 1 m Discuss
- 9. The languages used in China is
Options- A. Chinese, English
- B. Chinese, Arabic
- C. Chinese, French
- D. Chinese, Korean Discuss
- 10. Who has written the book 'My Frozen Turbulence in Kashmir'?
Options- A. Anees Jung
- B. Jagmohan
- C. M.J.Akbar
- D. Nissim Ezekiel Discuss
More questions
Correct Answer: the focus within the body of the earth
Correct Answer: haematite
Correct Answer: curtain
Correct Answer: p-electrons in CI(Z = 17)
Correct Answer: NATO
Correct Answer: Cosmic rays
Correct Answer: drachma
Explanation:
The Euro has been in use in Greece since January the 1st, 2002. So, now Euro (?) is the official currency of Greece. Before that date, the currency that was used in Greece was the drachma.
Correct Answer: 1 angstrom
Explanation:
1 angstrom = 1.0 x 10
-10 meters
Correct Answer: Chinese, English
Correct Answer: Jagmohan
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