1. If the distance between two masses is doubled, the gravitational force between them becomes less than the previous force.
Ans: Right
2. The CGS unit of G is dyne.cm2/g2.
Ans: Right
3. The value of gravitational acceleration at the centre of earth is zero.
Ans: Right
4. The value of g is highest at the equator.
Ans: Wrong
5. The value of G varies from place to place.
Ans: Wrong
6. As we go above the earth’s surface, value of g increases.
Ans: Wrong
7. Free fall of an object does not depend on the mass of the object.
Ans: Right
8. Mass is a qualitative measure of the inertia of an object.
Ans: Wrong
9. The similarity between the properties of the first and eighth elements is called the octave rule.
Ans: Right
10. In Dobreiner’s triads, three elements appear to be arranged in ascending order of their atomic number.
Ans: Wrong
11. While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
Ans: Right
12. The modern periodic table has 1 to 7 periods.
Ans: Right
13. The modern periodic table shows the molecular masses of the elements in each frame.
Ans: Wrong
14. p-block is composed of groups 1 and 2.
Ans: Wrong
15. To the left of the zig-zag line in the periodic table are the metal elements.
Ans: Right
16. The valency of the elements in group 2 is 1.
Ans: Wrong
17. Nanometer unit is used to measure atomic radius.
Ans: Wrong
18. Moving from left to right, the size of the atom decreases.
Ans: Right
19. All the elements in the halogen family are gases.
Ans: Wrong
20. The elements lithium and beryllium are in the same period because their valencies are similar.
Ans: Wrong
21. Beryllium and calcium are alkaline earth metals.
Ans: Right
22. The K and L shells of the elements Na and Mg contain electrons.
Ans: Right
23. The number of shells decreases in a group from top to bottom.
Ans: Wrong
24. The metallic character of the element decreases moving across a period from left to the right.
Ans: Right
25. The size of an atom depends on the number of valence electrons.
Ans: Wrong
26. Silicon is a metallic element.
Ans: Wrong
27. On moving down the group metallic character increases.
Ans: Right
28. Electronegativity is the metallic property of an element.
Ans: Wrong
29. If edible oil is left aside for a long time, it will get rancid.
Ans: Right
30. The alternating current is an oscillatory current.
Ans: Right
31. Live wire and neutral wires have a 220 V potential difference.
Ans: Right
32. Increasing the current passing through the wire decreases the magnetic field intensity.
Ans: Wrong
33. Galvanometers are used for electrical measurements.
Ans: Right
34. The frequency of the alternating current is 50 Hz.
Ans: Right
35. Electric motors are devices that convert electrical energy into mechanical energy.
Ans: Right
36. The dew point temperature does not depend on the amount of vapor in the air.
Ans: Wrong
37. The specific heat capacity of water is 1 cal / g °C.
Ans: Right
38. The latent heat of vaporisation is a term referred for the conversion of gas into liquid.
Ans: Wrong
39. Calorimeters are used to study anomalous behaviour of water.
Ans: Wrong
40. During reheating, ice is converted to water at a temperature of 0 °C.
Ans: Right
41. 1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.
Ans: Right
42. Calorimeters are used to measure specific heat capacity.
Ans: Right
43. All metals have the same specific heat capacity.
Ans: Wrong
44. Humidity relative to dew point temperature is 100%.
Ans: Right
45. The unit of absolute humidity is kg /m3
Ans: Right
46. 1 calorie is 4.81 joules.
Ans: Wrong
47. The incident rays and refracting rays are on opposite sides of the normal.
Ans: Right
48. Purple has the lowest refractive index.
Ans: Wrong
49. The speed of light varies in different media.
Ans: Right
50. Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass.
Ans: Wrong
51. The image of the object in the human eye is formed on the cross screen.
Ans: Wrong
52. Hypermetropia can be corrected using concave lens of proper focal length.
Ans: Wrong
53. When the incident ray is parallel to the principal axis, the refracted ray passes through the principal focus.
Ans: Right
54. The image of an object at an infinite distance is obtained in a real and erect form through a convex magnifying glass.
Ans: Wrong
55. The power of the magnifying glass depends on the distance of the magnifying glass from object.
Ans: Wrong
56. The lens of the eye is flattened when looking at nearby objects.
Ans: Wrong
57. For a healthy human eye, the distant point is infinite distance.
Ans: Right
58. Vision defect that increases distance between the lens of the eye and retina of the eye is termed as myopia.
Ans: Right
59. The virtual image of object seen by the eye depends on the angle subtended by the object with the eye.
Ans: Right
60. Electrolysis is used to obtain pure metal from impure metal.
Ans: Right
61. Ionic compounds are soluble in kerosene.
Ans: Wrong
62. In solid state, ionic compounds conduct electricity.
Ans: Wrong
63. Mercury, silver, gold are highly reactive metals.
Ans: Wrong
64. In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Ans: Wrong
65. In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Ans: Wrong
66. The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Ans: Wrong
67. Cassiterite is a copper ore.
Ans: Wrong
68. Diamond is a hard substance.
Ans: Right
69. Gold and silver are active metals.
Ans: Wrong
70. Halogen reacts with acid.
Ans: Right
71. Bauxite reacts with sodium hydroxide in the Bayer’s process.
Ans: Right
72. The number of electrons in the valence shell of a carbon atom is 4.
Ans: Right
73. Your body is made up of carbon.
Ans: Right
74. Carbon compounds contain only open chains of carbon atoms.
Ans: Wrong
75. Two carbon atoms can always form one or two covalent bonds.
Ans: Wrong
76. In general, saturated compounds are more reactive than unsaturated compounds.
Ans: Wrong
77. Benzene is a cyclic unsaturated hydrocarbon.
Ans: Right
78. Cyclohexane is a branched chain type of hydrocarbon.
Ans: Wrong
79. As one ascends in any homologous series, physical properties change gradually.
Ans: Right
80. There are different general molecular formula for all members of the homologous series.
Ans: Wrong
81. In LPG, butane is a flammable component.
Ans: Right
82. Substances that can give oxygen to other substances are called reductant.
Ans: Wrong
83. Potassium permanganate is an oxidizing compound in regular use.
Ans: Right
84. Colorless ethanol is in liquid state at room temperature.
Ans: Right
85. Ethanol is soluble in water in all proportions.
Ans: Right
86. Ester is a sweet-smelling compound.
Ans: Right
87. The escape velocity on the moon is less than the escape velocity on earth.
Ans: Right
88. India is the first country to discover the existence of water on the moon.
Ans: Right
89. The function of a satellite launcher is based on Newton’s second law of motion.
Ans: Wrong