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General Knowledge on Physics

(Click on suggested Options to select the answer | Color Red means : Wrong & Green Means: Correct)
1. In an satellite a spacetraveller tries to fill ink in a pen by dopping it in ink. The amount of the link filled in the pen as compared to the quantity of ink filled on the earth's surface will be
2. Two identical piano wires have same fundamental frequency when kept under the same tension. What will happen if tension of one of he wires id slightly increased and both the wires are made to vibrate simultaneously?
3. The photoelectric effect is described as the ejection of electrons from the surface of a metal when
  • A. it is heated
  • B. it is placed in strong electric field
  • C. electrons of suitable velocity impinge on it
  • D. light of suitable wavelength falls on it
  • Check Answer | Discussion
4. A beautiful rainbow on the sky is due to the
  • A. dispersion of sunlight from a water droplet only
  • B. reflection of sunlight from a water droplet only
  • C. reflection and refraction sunlight from a water droplet only
  • D. refraction,dispersion and reflection of sunlight from a water droplet
  • Check Answer | Discussion
5. Which one of the following materials will have maximum sound velocity?
6. A liquid is kept in a regular cylindrical vessel up to a certain height . If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will
  • A. remain unaffected
  • B. be reduced to half the earlier pressure
  • C. be increase to twice the earlier pressure
  • D. be reduced to one-fourth the earlier pressure
  • Check Answer | Discussion
7. When a ball drops onto the floor it bounces. Why does it bounce?
  • A. The floor is perfectly fluid
  • B. The floor heats up on impact
  • C. Newton's third law implies that for every action (drop), there is a reaction (bounce)
  • D. The floor exerts a force on the ball during the impact
  • Check Answer | Discussion
8. Gases begin to conduct electricity at the low pressure because
  • A. at low pressure gases turn into plasma
  • B. colliding electrones can acquire higher KE due to increased mean free path leading to ionisation of atoms
  • C. atoms break up into electrons and protons and electron started conducting electricity
  • D. the electrons in the atom move freely in low pressure
  • Check Answer | Discussion
9. Telescopes are placed in space to view distant galaxies primarily to
  • A. get closer to the observed objects
  • B. avoid the absorption of light or other radiations in the atmosphere of the Earth
  • C. avoid light pollution from the Earth's populated areas
  • D. avoid steering the telescope against the Earth's motion
  • Check Answer | Discussion
10. In scuba diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because

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