S.No. |
Questions |
Answer |
1. |
Who firstly demonstrated experimentally the existence of electromagnetic wave? |
Hertz |
2. |
The working of the quartz crystal in the watch is based on which effect? |
Piezoelectric Effect |
3. |
What is the unit of Radioactivity? |
Curie |
4. |
What is the wavelength of visible spectrum? |
390-700 nanometres |
5. |
One astronomical unit is the average distance between___? |
Earth & Sun |
6. |
Number of basic S.I. units is ___. |
Seven (7) |
7. |
What is the name of the scientist who stated that matter can be converted into energy? |
Einstein |
8. |
The size of atomic nucleus is of the order of___? |
10^-14 m |
9. |
A temperature at which both the Fahrenheit and the centigrade scales have the same value? |
-40° |
10. |
In the visible spectrum which colour has the shortest wavelength? |
Violet |
11. |
What is the unit of specific resistance? |
Ohm-metre |
12. |
What do we use as a moderator in nuclear reactor? |
Graphite |
13. |
The mirror used in motor vehicles near the driver’s seat is a__? |
Convex Mirror |
14. |
Electron microscope was invented by__? |
Robert Koch |
15. |
The hydraulic brake used in automobiles is a direct application of__? |
Pascal’s Law |
16. |
The filament of an electric bulb is made of which metal? |
Tungsten |
17. |
Camberts Law is related to__? |
Interference |
18. |
Which waves are used in sonography? |
Ultrasonic waves |
19. |
Which instrument is used to measure the power of electric circuit? |
Wattmeter |
20. |
Splitting of Uranium nucleus releases_____ energy. |
Nuclear |
21. |
kilowatt hour is the unit of__? |
Energy |
22. |
A simple device that is used to either break or complete the electric circuit, is called _____? |
Switch |
23. |
Where the value of ‘g’ (acceleration due to gravity) is maximum? |
At poles |
24. |
Good conductors have many loosely bound __? |
Electrons |
25. |
If the body is hollow, then its centre of gravity lies? |
outside the material |
26. |
A man with a dark skin, in comparison with a man with a white skin, experiences__? |
Less heat, Less cold |
27. |
What is the escape velocity for all objects from the earth? |
11.16 km/sec |
28. |
If the temperature inside a room is increased, the relative humidity will? |
Decrease |
29. |
If a bar magnet is cut length wise into 3 parts, what will the total number of poles be? |
6 |
30. |
Light travels in a____? |
Straight line |
31. |
What converts the alternating current into direct current? |
Rectifier |
32. |
Einstein got noble prize for____? |
Photoelectric Effect |
33. |
The nucleus of an atom consists of__? |
Neutrons and protons |
34. |
What is the measuring unit of length of light waves? |
Angstrom |
35. |
How much is one barrel of oil approximately equal to? |
159 litres |
36. |
The sky appears black from the moon because of___? |
Lack of Atmosphere |
37. |
The specific resistance of a wire varies with its___? |
Material |
38. |
Which instrument is used to measure depth of ocean? |
Fathometer |
39. |
The unidirectional property of a PN-junction is useful for its use as which thing? |
Rectifier |
40. |
The strongest force in the nature is ____? |
Nuclear Force |
41. |
Which is the only natural magnet? |
Magnetite |
42. |
We cannot see during a fog, because of ____. |
Scattering of light |
43. |
In which medium sound travels faster? |
Solid |
44. |
A fast wind can turn the blades of a windmill because it possesses__. |
Potential Energy |
45. |
Which of the following material is used for electric wire heater? |
Nichrome |
46. |
Conversion of chemical energy into electrical energy occurs in which thing? |
Battery |
47. |
The direction of a magnetic field within a magnet is___? |
From South to north |
48. |
What remains constant while throwing a ball upward? |
Acceleration |
49. |
What type of lens is a magnifying glass? |
Convex lens |
50. |
Why does a liquid drop tend to assume a spherical shape? |
To minimize surface tension |
51. |
What happens when soda water bottle falls freely? |
No bubbles form |
52. |
Pure water freezes at what temperature? |
32 F |
53. |
Why are Metals good conductor of heat than insulator? |
they contain free electrons |
54. |
When some detergent is added to water, the surface tension___? |
Decreases |
55. |
The value of which quantity remains same in all system of units? |
Specific Gravity |
56. |
Distance of stars are measured in___? |
Light Years |
57. |
Nature of sound wave is ____? |
Longitudinal |
58. |
Which is used to initiate fissions? |
Neutrons |
59. |
The total internal reflection can occur when light pass from___. |
Denser to Rarer medium |
60. |
Who discovered Diode Bulb? |
Sir J. S. Fleming |
61. |
Radio waves of constant amplitude can be generated with___? |
Oscillator |
62. |
What is the SI unit of luminous intensity? |
Candela |
63. |
What is the name of short duration wave? |
Pulse |
64. |
The absorption of ink by blotting paper involves___? |
Capillary Action |
65. |
Two drops of a liquid are merged to form a single drop. In this process___? |
Energy is released |
66. |
Which is more elastic – Steel or Rubber? |
Steel |
67. |
An atom bomb is based on the principle of___? |
Nuclear Fission |
68. |
Which instrument is used to measure the scattering of light by particles suspended in a liquid? |
Nephetometer |
69. |
The speed of light with the rise in the temperature of the medium ___? |
Remains unaltered |
70. |
Most commercial nuclear power plants worldwide are cooled by __? |
Water |
71. |
Electric Motor converts____? |
Electric energy to
mechanical energy |
72. |
Nuclear sizes are expressed in a unit named____? |
Fermi |
73. |
Weightlessness experienced in a spaceship is due to___? |
Absence of Gravity |
74. |
The blue colour of the clear sky is due to ____? |
Dispersion of Light |
75. |
What does airbag, used for safety of car driver, contain? |
Sodium Azide |
76. |
Radian is used to measure___? |
Angle |
77. |
Who had showed that the electric and magnetic waves are equal in vacuum? |
James Clerk Maxwell |
78. |
When a red glass is heated in dark room it will seem___. |
Green |
79. |
The friction force exerted by fluids is called ___. |
Drag |
80. |
Which is used in designing ships and submarines? |
Archimedes Principle |
81. |
Which instrument is used to measure change in volume of substances? |
Dilatometer |
82. |
On which principle, transformer works? |
Mutual Induction |
83. |
Potential energy of your body is minimum when you ___. |
Lie down on ground |
84. |
The velocity of sound in air___? |
332m/sec |
85. |
Beats occur because of __? |
Interference |
86. |
In summer, the mirages are seen due to the phenomenon of __? |
Total Internal Reflection |
87. |
Who gave the first experimental value of G? |
Cavendish |
88. |
Astigmatism can be corrected by__? |
Cylindrical lenses |
89. |
What apparatus is used to locate a submerged object? |
SONAR |
90. |
The image formed by convex lens in a simple microscope is__. |
Virtual & Erect |
91. |
What is the unit of magnetic flux? |
Maxwell |
92. |
Coolis tube is used to produce___? |
X-Rays |
93. |
Sudden fall in barometer is indication of___? |
Storm |
94. |
Force of attraction between the molecules of different substances is called___? |
Adhesive Force |
95. |
What is the working principle of Washing machine? |
Centrifugation |
97. |
Insects can move on the surface of water without sinking due to___. |
Surface tension of water |
98. |
The temperature of the sun is measured with ___. |
Pyrometer |
99. |
Acceleration acts always in the direction__? |
of the net force |
100. |
Which instrument is used to measure altitudes in aircrafts? |
Altimeter |