1. The term reactor referred to in waste water treatment is –
Correct : D. Aeration tank
2. The dimension MLT⁻² corresponds to
Correct : A. force
3. Good conductors have many loosely bound .
Correct : D. electrons
4. Cactus is referred to as -
Correct : C. Xerophyte
5. Which, of the following radiations has the least wavelength?
Correct : C. g-rays
6. What is the physical state of water at 12° C?
Correct : C. Liquid
7. Change in quality of environment that can be harmful and unpleasant for living things is called
Correct : B. Pollution
8. Which among the following lens is used to correct Presbyopia?
Correct : D. Bifocal
9. The element of Electric stove is made of
Correct : D. Nicrome
10. Who invented the Centigrade scale?
Correct : A. Anders Celsius
11. The following is an amplifying device :
Correct : B. a transistor
12. Which of the following is used in oven?
Correct : C. Microwaves
13. Which unit we use to express nuclear sizes?
Correct : C. Fermi
14. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."
Correct : B. Newton's law of cooling
15. The constant temperature, the product of pressure and volume of a given amount of a gas is constant . This is .
Correct : C. Boyle’s law
16. The device used for measuring the wavelength of X-rays is –
Correct : C. Bragg Spectrometer
17. If a lift is going up with acceleration, the apparent weight of a body is -
Correct : D. More than the true weight
18. Centigrade and Fahrenheit temperatures are the same at –
Correct : D. -40°
19. Two bodies kept at a certain distance feel a gravitational force F to each other. If the distance between them is made double the former distance, the force will be -
Correct : D. F/4
20. 1 Micron is equal to –
Correct : C. 10⁻⁶ m
21. A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an
Correct : A. Audible wave
22. Which instrument is used to measure altitudes in aircraft’s?
Correct : C. Altimeter
23. When an object is heated, the molecules of that object -
Correct : A. began to move faster
24. In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie?
Correct : C. Ultraviolet
25. A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes-
Correct : B. x
26. Which one of the following reflects back more sunlight as compared to other three?
Correct : B. Land covered with fresh snow
27. The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as:
Correct : C. Ohms law
28. At low temperature, Lead behaves as a
Correct : B. Super conductor
29. The mean distance from the Sun to the Earth is called:
Correct : B. Astronomical Unit
30. “Curie” is the unit of –
Correct : A. radioactivity
31. Which of the following is the cleanest source of energy?
Correct : D. Wind energy
32. Sending a frame to a group of stations is known as –
Correct : C. Multicasting
33. Which one among the following components can not be developed within an "integrated circuit"?
Correct : C. Transformer
34. The fuse in an electric circuit is connected in –
Correct : D. series with live
35. A particle is thrown vertically upward. When it reaches the highest point, it has –
Correct : A. a downward acceleration
36. Which one of the following is an ohmic conductor?
Correct : D. Silver
37. The spring balance works on the principle of -
Correct : B. Hooke's Law
38. Fill in the blank with the most appropriate option. The Universal Constant of Gravitation is
Correct : C. 6.67 x 10⁻¹¹ Nm²/kg²
39. A moving car possesses -
Correct : B. mechanical energy
40. Which Article of the Indian Constitution provides free and compulsory education to children?
Correct : A. 21-A
41. The cooling by a desert Cooler is based on:
Correct : C. Evaporative Cooling
42. Distant objects are visible as a little out of focus in this condition –
Correct : D. myopia
43. That an Iron ship floats in water but an Iron ball sinks, is an example of -
Correct : C. Archimedes Principle
44. A temperature rise in environment that disturbs life is called -
Correct : C. thermal pollution
45. What is the approximate height of a geostationary satellite from the surface of the earth?
Correct : C. 35000 km
46. What is the SI unit of frequency?
Correct : D. Hertz
47. The metallurgical process in which a metal is obtained in a fused state is called -
Correct : C. smelting
48. Which one of the following elements shows variable equivalent mass?
Correct : D. Iron
49. Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
Correct : D. becomes one-fourth
50. The dimensional formula for universal gravitational constant is –
Correct : D. M⁻¹L³T⁻²
51. Alpha particle is the nucleus of an atom of –
Correct : C. Helium
52. Which of the following supports particle nature of photons?
Correct : C. Photoelectric effect
53. 'Farad' is the unit of :
Correct : A. Capacitance
54. Man perceives sound vibrations in the frequency ranges of –
Correct : D. 20 - 20000 Hz
55. The quantum theory of light was given by –
Correct : B. Plank
56. The earth is a –
Correct : C. good absorber and good radiator of heat
57. Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
Correct : B. Newton’s law of cooling
58. Why does water tank appear shallower when viewed from the top?
Correct : B. Due to refraction
59. Which colour is formed when Red and Green are mixed?
Correct : B. Yellow
60. A water tank appears shallower when it is viewed from top due to –
Correct : D. refraction
61. The quality or tone of a musical sound produced by a stringed instrument depends on –
Correct : D. wave form of the sound
62. Rocket works on the principle of –
Correct : A. Newton's Third Law
63. Water is used in hot water bags because
Correct : C. It has high specific heat
64. The motion of the wheels of a bullock- cart while moving on the road is an example of –
Correct : C. Translatory and rotatory motion
65. Acceleration is –
Correct : A. Inversely proportional to force
66. A bomb explodes on the moon. You will hear its sound on earth after –
Correct : D. You cannot hear the sound of explosion
67. One nanometer is equal to meters.
Correct : C. 10 raised to the power (-9)
68. Which of the following is an example of simple harmonic motion?
Correct : B. Simple pendulum motion
69. Magnetic keepers are used to protect magnets from :
Correct : C. self-demagnetization
70. When we hear a sound, we can identify its source from .
Correct : B. the overtones present in the sound
71. A galvanometer can be converted into a voltmeter by connecting with it a –
Correct : C. high resistance on series
72. One nanometer is equal to meters.
Correct : C. 10 raised to the power (-9)
73. What is the objective of the Kyoto Protocol?
Correct : D. To reduce greenhouse gases
74. Rainbow is formed due to –
Correct : D. refraction and reflection
75. Water is used in a hot water bag because –
Correct : C. It has high specific heat
76. A fountain pen works on the principle of
Correct : B. Capillary action
77. The fundamental scientific principle in the operation of battery is –
Correct : C. dissociation of electrolytes
78. Velocity of sound in air does not change with the change of –
Correct : B. Pressure of air
79. The stability of a pond ecosystem depends on -
Correct : D. producers and consumers
80. Before X-ray examination (coloured X- ray) of the stomach, patients are given suitable salt of barium because.
Correct : A. barium is a good absorber of X-rays and helps stomach to appear clearly
81. Convex mirrors are used as a rear view mirror in motor cycles because
Correct : C. it forms smaller image as compared with object
82. Railway tracks are banked on curves so that –
Correct : C. Necessary centripetal force may be obtained from the horizontal component of the weight of the train
83. What is the range of mercury thermometer?
Correct : D. -30 degree Celsius to 350 degree Celsius
84. The width of depletion layer of a P-N junction –
Correct : D. is increased under reverse bias
85. Ventilators are provided near the ceiling of the room because –
Correct : A. the exhaled warmer air rises up and goes out
86. What is a neuron?
Correct : D. Basle unit of nervous system
87. Which of the following is not caused by atmospheric refraction of light?
Correct : C. Sun appearing higher in the sky than it actually is
88. Why the needle of iron swims on water surface when it is kept gently?
Correct : C. due to surface tension
89. In which of the following cases, kinetic energy is being used in performing work?
Correct : B. Driving a car to cover a distance
90. The spoon dropped by an astronaut in a satellite will –
Correct : C. Continue to follow the motion of the satellite
91. Which of the following options correctly explains the term heat budget?
Correct : B. It is the balance between incoming and outgoing radiation.
92. The purpose of choke in a fluorescent lamp is –
Correct : B. to decrease the current flow
93. To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor –
Correct : D. should be made of a good conductor like copper with sharp-pointed edges
94. Beta rays emitted by a radioactive material are –
Correct : B. Charged particles emitted by nucleus
95. What is the principle of a life Jacket'?
Correct : B. It increases the volume of the person to keep him afloat
96. Steam at 100°C causes more severe burns than water at 100° C because –
Correct : B. steam has latent heat of vaporization
97. Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be –
Correct : A. at a higher level in water
98. Indicate the false statement about the resistance of a wire –
Correct : C. it is directly proportional to the area of cross- section of wire
99. A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that –
Correct : A. The rubber ball suffers greater change in momentum
100. In a conductor –
Correct : D. the valence band and the conduction band overlap each other