81. Refraction of light, as it enters from one transparent medium to another, is due to
(a) change in temperature of the media.
(b) change in the amplitude of light.
(c) change in speed of light.
(d) internal property of light.

82. A bus starting from a bus-stand and moving with uniform acceleration attains a speed of 20 km/h in 10 minutes. What is its acceleration ?
(a) 200 km/h²
(b) 120 km/h²
(C) 100 km/h²
(d) 240 km/h²

83. Which one of the following is the correct reactivity order of metals reacting with dilute HCI ?
(a) Mg > Al > Zn > Fe
(b) Mg < Al < Zn < Fe
(c) Mg > Zn > Fe> Al
(d) Fe > Mg > Al > Zn

84. Which one of the following acids is secreted by leaves of Nettle that causes painful stings?
(a) Methanoic acid
(b) Citric acid
(c) Tartaric acid
(d) Acetic acid

85. Which of the following statements is/are correct?
1. All the bases are alkali.
2. All alkalis dissolve in water.
3. Alkalis are soapy to touch, bitter in taste and corrosive in nature.
Select the correct answer using the code given below:
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 3 only

86. Which one of the following materials is present in a guard tube (drying tube) that is used for preparation of HCl gas ?
(a) Calcium chloride
(b) Calcium bromide
(c) Calcium iodide
(d) Calcium fluoride

87. Fertilizers are used to obtain higher yields of crops. However, all nutrients are usually not available in fertilizers. Which one of the following nutrients is usually not available in fertilizers ?
(a) Iron
(b) Potassium
(c) Nitrogen
(d) Phosphorus

88. Rupa and Sachin observed an animal in their school garden. Rupa called it an insect while Sachin identified it as an earthworm. Which one of the following characteristics confirms that it is an insect ?
(a) The animal had jointed legs.
(b) Body of the animal had very little segmentation.
(c) Body of the animal was cylindrical.
(d) Body of the animal was bilaterally symmetrical.

89. Animals which are marine, bilaterally symmetrical, have a coelom and a notochord, but never form a vertebral column are placed under which one of the following groups?
(a) Chordata
(b) Protochordata
(c) Vertebrata
(d) Mammalia

90. What is the location of intercalary meristem in plants?
(a) Base of the leaves or internodes
(b) Stems or roots
(c) Tips of stems and leaves
(d) Base of flower pedicel

91. The federation of which one of the following States has been described as “an indestructible union of indestructible states”?
(a) India
(b) U.S.A.
(c) Canada
(d) Australia

92. Who among the following is the author of the famous essay, “The End of History and the Last Man”?
(a) Francis Fukuyama
(b) Daniel Bell
(c) Abraham Lincoln
(d) Anthony Giddens

98. Which one of the following statements is not correct?
(a) Allahabad High Court has a Bench at Lucknow.
(b) Madhya Pradesh High Court has a Bench at Gwalior.
(c) Rajasthan High Court is located at Jodhpur.
(d) Guwahati High Court has no Bench.

94. Which among the following is not a condition for the disqualification of a Member of Parliament?
(a) Voluntary acquisition of citizenship of a foreign country
(b) Holding the office of the Chairperson of the National Commission for Women
(c) The Member abstains from voting in the House without prior permission
(d) The Member holds the office of the Chairman of the Board of Directors of the National Coal Development Corporation Ltd.

95. Who among the following considered the Directive Principles of State Policy as aiming at ‘furthering the goals of social exclusion’?
(a) B.N. Rau
(b) Granville Austin
(c) K. C. Wheare
(d) Rajni Kothari

96. D performs her train journey by the shortest route from Bengaluru to New Delhi. Which one of the following rivers will she not cross while performing the journey?
(a) Narmada
(b) Yamuna
(c) Godavari
(d) Krishna

97. Identify the State on the basis of the following characteristics :
1. Tropic of Cancer passes through the State.
2. The State has more north-south extension.
3. The State has international border with Bangladesh and Myanmar.
Select the correct answer using the code given below:
(a) Tripura
(b) Mizoram
(c) Nagaland
(d) Manipur

98. M wants to visit a place in a Union Territory, which is located at 34° N and 77° E. Which one of the following Union Territories must he have planned to visit ?
(a) Andaman and Nicobar Islands
(b) Lakshadweep
(c) Puducherry
(d) Ladakh

99. Consider the following statements with respect to the adolescent population (age group of 10 to 19 years) of India, according to the 2011 Census:
1. Adolescent population comprises half the population of the country.
2. The group is regarded as youthful population with high potential.
3. In this group there are greater number of females than males.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) 1 and 2 only
(d) 2 and 3 only

100. In a discussion, M from Arunachal Pradesh, J from Assam, N from Meghalaya and S from Nagaland are claiming that as per Census 2011, their State has the maximum density of population. Identify the person making the correct claim.
(a) M
(b) J
(c) N
(d) S