#4. …………………..is used for the welding of railway tracks.
#5. Heating up of sulphide ore in the presence of air at high temperature is called………………
#6. Cinnabar is the ore of
#7. For making ornaments of gold, it is mixed with
#8. Oxides of non-metals are
#9. Earthy impurities of stand and clay associated with ore are called
#10. Aqua regia is the fresh mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio……………………..
#11. ………..is a a non metal which is liquid.
#12. Main component of CNG is …………………
#13. In electrolytic refining impure metal is made.
#14. Vinegar is………………..% aqueous solution of acetic acid.
#15. Molecules of soaps are the…………….and……………salt of long chain carboxylic acids
#16. Respiration is an/a …………..process.
#17. Chemical formula of slaked lime is………………….
#18. Isobars are the atoms which have……………mass number but………….atomic number
#19. Electron and proton were discovered by………………..
#20. sotope of which element is used for treatment of cancer ?
#21. Which gas is filled in the packet of chips ?
#22. Litmus is obtained from which plant ?
#23. Atmosphere of which planet is made up of clouds of SULPHURIC ACID ?
#24. Which acid is present in ant bite ?
#25. Baking Powder is the mixture of
#26. Which PH value of acid rain is……………….
#27. Which metal melts in human hand ?
#28. Which compound can be used to prevent souring of milk ?
#29. Solution of which compound is used for white wash ?
#30. For the given reaction which one is incorrect ?
#31. ‘Twinkling of stars’ is based on which phenomenon.
#32. A car moves 1/3 distance with speed 20km/hr and 2/3 with 60 km/hr Average speed is……….
#33. Maximum value of current from A.C source of 50Hz is 5A. The time taken by current to grow from 0 to 2.5A is :
#34. Dolphins, bats and porpoises produce which type of waves
#35. In the inner ear the pressure variations are turned into electrical signals by :
#36. Which maxwell's equations shows that magnetic poles always exist in pair ?
#37. Which type of energy is stored in capacitor
#38. The focal length of an equivalent lens made by 2 lenses of focal lengths f1 and f2 , separated by a small distance x is given by :
#39. The phenomenon of polarization of light indicated that
#40. For which among X-rays, red light, blue light, yellow light the stopping potential is minimum
#41. Which of the following spectral series in hydrogen atom give spectral line of 4860° A ?
#42. The values of potential energy, kinetic energy and total energy of the electron in the fourth orbit of hydrogen atom are respectively :
#43. Which of the following cannot be deflected by electric and magnetic fields:
#44. Which is the first nuclear reactor set up in India in 1956 ?
#45. Choose the correct option :
#46. Choose the correct option :
#47. In the following, which one of the diode is reverse biased ?
#48. A heavy and light body are dropped from the top of a tower, which will reach the ground first ?
#49. A parachutist drops freely from an aeroplane for 10s before the parachute opens out. Then he descents with a net retardation of 2.5 m/s^2 . He bails out of the plane at a height of 2495m and g = 10 m/s^2 his velocity on reaching the ground will be:
#50. A bomb at rest explodes into 2 equal pieces. The angle b/w the velocity vectors at which 2 pieces fly off will be :
#51. In a beaker of water an iron nails sinks but cork of same mass floats why ?
#52. Choose the correct option :
#53. Which of the following graph represents the correct variation of pressure(P) with depth(h) below the surface of ocean ?
#54. An earth satellite is moving around the earth in circular orbit which one is conserved ?
#55. At which temperature Celsius scale and Fatrenheit scale same reading ?
#56. When gas in a vessel expands. Its internal energy decreases. The process involved is……….
#57. Oxygen and Hydrogen are at the same temperature T. The ratio of the mean kinetic energy of oxygen molecules to that of the hydrogen molecules will be.
#58. A metallic hollow sphere filled with water, having a small hole at the bottom is used as the bob of the simple pendulum. The time period of such a pendulum
#59. Alternating current can not measured by d.c. ammeter because.
#60. 100J of heat is producing per sec. In a resister of 4 ohm. Then potential difference at the ends of resistor will be.