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- Question
For photoelectric effect to take place, the metal used as the cathode should have_________
Options- A. high melting point
- B. low melting point
- C. Low work function
- D. low resistance
- Correct Answer
- Low work function
- 1. Speed of light is maximum in _____.
Options- A. vacuum
- B. solids
- C. liquids
- D. gases Discuss
- 2. Negative acceleration is in the opposite direction of:
Options- A. force
- B. distance
- C. velocity
- D. momentum Discuss
- 3. 1 kW = ?
Options- A. 1000 W
- B. 10 W
- C. 100 W
- D. 10000 W Discuss
- 4. Choose the most appropriate answer:Natural radioactivity was discovered by
Options- A. Marie Curie
- B. Earnest Rutherford
- C. Henry Bacquerel
- D. Enrico Fermi Discuss
- 5. What is the minimum distance (in metres) required to hear an echo?
Options- A. 10
- B. 13
- C. 17
- D. 21 Discuss
- 6. A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?
Options- A. The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
- B. Both the photons have different energies.
- C. The speeds of both the photons in vacuum are different
- D. The frequency of X-ray photon is higher than the frequency of visible radiation photon. Discuss
- 7. Optical fibre works on which of the following principle of light?
Options- A. Reflection
- B. Refraction
- C. Diffraction
- D. Total internal reflection Discuss
- 8. The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by
Options- A. Galileo
- B. Martin Luther
- C. Johannes Kepler
- D. Copernicus Discuss
- 9. For which of the following game, players must have the knowledge of Pascal's law?
Options- A. Climbing
- B. Paragliding
- C. Rafting
- D. Scuba diving Discuss
- 10. At what temperature (in degree celsius), the numerical values on Celsius and Fahrenheit scales become equal?
Options- A. ?40
- B. 40
- C. 273
- D. -273 Discuss
Physics problems
Search Results
Correct Answer: vacuum
Correct Answer: velocity
Correct Answer: 1000 W
Correct Answer: Henry Bacquerel
Explanation:
Natural radioactivity was discovered by Henri Bacquerel.
Correct Answer: 17
Correct Answer: The speeds of both the photons in vacuum are different
Explanation:
The speed of all the electromagnetic radiation are always same and equal to the numerical value 3 x 10^8m/sec.
Correct Answer: Total internal reflection
Correct Answer: Johannes Kepler
Explanation:
Kepler?s laws of planetary motion state that (a) All planets move in elliptical orbits with the Sun at one of the focal points (b) The radius vector drawn from the sun to a planet sweeps out equal areas in equal time intervals. This follows from the fact that the force of gravitation on the planet is central and hence angular momentum is conserved. (c) The square of the orbital period of a planet is proportional to the cube of the semi major axis of the elliptical orbit of the plane.
Correct Answer: Scuba diving
Correct Answer: ?40
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