GK (20-40)
20. Which of the following utilizes Newton’s third law of motion? - Space –rocket
21. The function of cement in masonry (stonework) is based on the phenomenon of - Adhesion
22. The main sources of heat is - The sun
23. Transmission of heat by the movement of heated particles is called - Convection
24. The air becomes heated by - Convection
25. In a thermos flask, a warm substance remains warm because - No heat neither enters into nor leaves the inside of the thermos flasks by any of the three methods of transmission conduction, convection and radiation
26. To a space traveler on the moon during day time the lunar sky appears - Black
27. At which temperature do the reading of the Centigrade and the Fahrenheit scale coincide - -400 C
28. Sound is a form of - Energy
29. Lightning is observed earlier than the sound is heard, because - Light travels faster than sound
30. The instrument connected with the recording and reproduction of sound is called - Gramophone
31. A mirage is the result of - Increase in the refractive index of the atmosphere with height
32. The dense mass of small water drops on smoke or dust particles in the lower layers of the atmospheres - Fog
33. A person can not see objects clearly which are nearer than 75 cm from his eyes. What disease is he suffering from
- Hypermetropia (long-sightedness)
34. A man can not see clearly beyond 10 meters. What disease is he suffering from - Myopia (shortsightedness)
35. A pond of clear water appears less deep than it really is. This is due to - Refraction
36. An earth satellite is kept moving in its orbit. It is due to the phenomenon of centripetal force provided by
- The gravitational attraction of the earth on the satellite
37. The speed of light was first measured by - Romer
38. The phenomenon of radio activity is associated with - Decay of the nucleus
39. When water freezes its density - Decreases
40. A ‘Celsius’ is a unit - Equivalent to degree centigrade
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