Physics
Que No 1 : A Periscope works by the principal of -
Ans : Total internal reflection .
Que No 2. The Electrode in the dry cell, which acts as the positive terminal is made of -
Ans : Carbon .
Que No 3. The lighting conductor or rod used for protecting buildings from lighting is made of-
Ans : Copper.
Que No 4. The pitch of a sound is determined by its-
Ans : Frequency .
Que No 5. A steel ball floats on mercury because the density of mercury is higher than-
Ans : Steel .
Que No 6. Sound Travels at maximum speed in -
Ans : Solid .
Que No 7. Atmospheric Pressure is measured by a -
Ans : Barometer.
Que No 8. The conversion of heat into electrical energy can be achieved by use of -
Ans Thermocouple.
Que No 9. Cream in milk is separated on account of -
Ans : Centrifugal force .
Que No 10. The difference between musical sound and noise is due to -
Ans : Pitch .
Que No 11. The mirror is coated with mercury at the backside to avoid the-
Ans : Refraction of light .
Que No 12. The most abundant element in the universe are -
Ans : Hydrogen and Helium .
Que No 13. Short circuit means the direct flow of current between points of the -
Ans : Same Potential .
Que No 14. The loudness of soundwave is determined by its -
Ans : Intensity.
Que No 15. A fuse in an electric circuit is used to break the circuit when-
Ans : Excessive current flows .
Que No 16. If a body is taken from the earth to the moon-
Ans : It mass will remain same but weight will be different .
Que No 17. The self maneuvering unit used by an astronaut works on Newton's -
Ans : Third law of motion .
Que No 18. Galvanometer is an instrument used for detecting and measuring-
Ans : Small eletric currents.
Que No 19. The sky is blue in colour because of the scattering of light by-
Ans : Dust Particles or air molecules .
Que No 20. The science of cryogenics deals with-
Ans : Low temperatures .
Que No 21. Atoms of the same atomic number but different atomic weight are-+
Ans : Isotopes.
Que No 22. The Phenomenon which can not be explained by wave theory is-
Ans : Photoelectric Emission.
Que No 23. Fish can survive inside a frozen lake because water near the bottom-
Ans : Does not freeze.
Que No 24. One finds it more difficult to walk on ice than on a concrete road because lack of-
Ans : Friction.
Que No 25. After a Shower of rain , a rainbow is seen-
Ans : At the opposite direction of the sun .
Que No 26. Raindrops are Spherical due to -
Ans : Surface Tension.
Que No 27. Hydraulic Brakes in atomobiles work on-
Ans : Pascal's law.
Que No 28. A liquid drop tends to have a Spherical Shape as it has-
Ans : Minimum surface energy .
Que No 29. Microphone converts sound energy into-
Ans : Electrical energy .
Que No 30. When light travel from diamond to glass-
Ans : Total internal reflection takes place .
Que No 31. Nuclear energy is -
Ans : A conventional source of energy.
Que No 32. Cobalt Isotopes are used for -
Ans : Cancer Treatment .
Que No 33. In an electric kettle water becomes hot by-
Ans : Convection .
Que No 34. A common Constituent of transistors is -
Ans : Germanium / Silicon .
Que No 35. Lunar eclipse is caused when the earth comes between-
Ans : The Sun and The Moon .
Que No 36. If a pendulum clock be taken from the equator to poles , it will -
Ans : Run Fast .
Que No 37. We Can not see during a fog because of -
Ans : Scattering of light .
Que No 38. Safety wire used in electrical circuits is made of a material having -
Ans : Low melting point .
Que No 39. Microphone convents sound energy into -
Ans : Electrical energy .
Que No 40. The Nature of the Wave of X-ray is -
Ans : Electromagnetic Transverse wave .
Que No 41. A body that Absorbs all the constituent colours of light will look-
Ans : Black .
Que No 42. The distance of near vision for normal eye is -
Ans : 25 cm.
Que No 43. The nature of light waves is similar to -
Ans : Gamma rays .
Que No 44. Tea will cool most easily in a -
Ans : Metal cup .
Que No 45. Light year is a unit of -
Ans : Distance .
Que No 46. Silver bromide is a light sensitive compound used in -
Ans : Photography .
Que No 47. Convex lens forms real image and concave lens forms only -
Ans : Virtual Image .
Que No 48. A red object , when seen through a thick blue glass , appears-
Ans : Black.
Que No 49. The speed of sound will be higher in humid air -
Ans : In comparison to dry air .
Que No 50. Sun's energy is produced by -
Ans : Nuclear fusion .
Que No 16. If a body is taken from the earth to the moon-
Ans : It mass will remain same but weight will be different .
Que No 17. The self maneuvering unit used by an astronaut works on Newton's -
Ans : Third law of motion .
Que No 18. Galvanometer is an instrument used for detecting and measuring-
Ans : Small eletric currents.
Que No 19. The sky is blue in colour because of the scattering of light by-
Ans : Dust Particles or air molecules .
Que No 20. The science of cryogenics deals with-
Ans : Low temperatures .
Que No 21. Atoms of the same atomic number but different atomic weight are-+
Ans : Isotopes.
Que No 22. The Phenomenon which can not be explained by wave theory is-
Ans : Photoelectric Emission.
Que No 23. Fish can survive inside a frozen lake because water near the bottom-
Ans : Does not freeze.
Que No 24. One finds it more difficult to walk on ice than on a concrete road because lack of-
Ans : Friction.
Que No 25. After a Shower of rain , a rainbow is seen-
Ans : At the opposite direction of the sun .
Que No 26. Raindrops are Spherical due to -
Ans : Surface Tension.
Que No 27. Hydraulic Brakes in atomobiles work on-
Ans : Pascal's law.
Que No 28. A liquid drop tends to have a Spherical Shape as it has-
Ans : Minimum surface energy .
Que No 29. Microphone converts sound energy into-
Ans : Electrical energy .
Que No 30. When light travel from diamond to glass-
Ans : Total internal reflection takes place .
Que No 31. Nuclear energy is -
Ans : A conventional source of energy.
Que No 32. Cobalt Isotopes are used for -
Ans : Cancer Treatment .
Que No 33. In an electric kettle water becomes hot by-
Ans : Convection .
Que No 34. A common Constituent of transistors is -
Ans : Germanium / Silicon .
Que No 35. Lunar eclipse is caused when the earth comes between-
Ans : The Sun and The Moon .
Que No 36. If a pendulum clock be taken from the equator to poles , it will -
Ans : Run Fast .
Que No 37. We Can not see during a fog because of -
Ans : Scattering of light .
Que No 38. Safety wire used in electrical circuits is made of a material having -
Ans : Low melting point .
Que No 39. Microphone convents sound energy into -
Ans : Electrical energy .
Que No 40. The Nature of the Wave of X-ray is -
Ans : Electromagnetic Transverse wave .
Que No 41. A body that Absorbs all the constituent colours of light will look-
Ans : Black .
Que No 42. The distance of near vision for normal eye is -
Ans : 25 cm.
Que No 43. The nature of light waves is similar to -
Ans : Gamma rays .
Que No 44. Tea will cool most easily in a -
Ans : Metal cup .
Que No 45. Light year is a unit of -
Ans : Distance .
Que No 46. Silver bromide is a light sensitive compound used in -
Ans : Photography .
Que No 47. Convex lens forms real image and concave lens forms only -
Ans : Virtual Image .
Que No 48. A red object , when seen through a thick blue glass , appears-
Ans : Black.
Que No 49. The speed of sound will be higher in humid air -
Ans : In comparison to dry air .
Que No 50. Sun's energy is produced by -
Ans : Nuclear fusion .
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