Physics problems
- 1. Speed of light is maximum in _____.
Options- A. vacuum
- B. solids
- C. liquids
- D. gases Also asked in: Bank Exams
Correct Answer: vacuum
- 2. 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 Also asked in: Bank Exams
Correct Answer: Low work function
- 3. 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. Also asked in: Bank Exams
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.
- 4. Optical fibre works on which of the following principle of light?
Options- A. Reflection
- B. Refraction
- C. Diffraction
- D. Total internal reflection Also asked in: Bank Exams
Correct Answer: Total internal reflection
- 5. 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 Also asked in: Bank Exams
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.
- 6. 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 Also asked in: Bank Exams
Correct Answer: Scuba diving
- 7. 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 Also asked in: Bank Exams
Correct Answer: ?40
- 8. 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 Also asked in: Bank Exams
Correct Answer: Only III
- 9. 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 Also asked in: Bank Exams
Correct Answer: uniformly accelerated
- 10. Contact force is another name for _________.
Options- A. Friction
- B. Magnetic force
- C. Electrostatic force
- D. Muscular force Also asked in: Bank Exams
Correct Answer: Muscular force
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