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- Question
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
- Correct Answer
- ?40
- 1. 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
- 2. 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
- 3. Optical fibre works on which of the following principle of light?
Options- A. Reflection
- B. Refraction
- C. Diffraction
- D. Total internal reflection Discuss
- 4. 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
- 5. 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 Discuss
- 6. Which of the following pair is INCORRECT? I. Parsec - Distance II. Barrel - Liquid III. Light year - Time
Options- A. Only III
- B. Only I and III
- C. Only II
- D. All are correct Discuss
- 7. The motion of a freely falling body is an example of ________________________ motion.
Options- A. uniformly accelerated
- B. non-uniformly accelerated
- C. constant velocity
- D. constant speed Discuss
- 8. Contact force is another name for _________.
Options- A. Friction
- B. Magnetic force
- C. Electrostatic force
- D. Muscular force Discuss
- 9. 1 m/s equals ____________ km/hr
Options- A. 5/16
- B. 16/5
- C. 18/5
- D. 5/18 Discuss
- 10. Friction is caused by the ______________ on the two surfaces in contact.
Options- A. irregularities
- B. smoothness
- C. densities
- D. gaps Discuss
Physics problems
Search Results
Correct Answer: Scuba diving
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: Total internal reflection
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: Low work function
Correct Answer: Only III
Correct Answer: uniformly accelerated
Correct Answer: Muscular force
Correct Answer: 18/5
Correct Answer: irregularities
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