UPSC CDS 2 Exam 14 Nov 2021 Paper (General Knowledge) (Answer Key)

101. Where should an object be placed in front of a convex lens to get a real and enlarge image of the object?
(a) At twice the focal length
(b) At infinity
(c) Between the principal focus and twice the focal length
(d) Beyond twice the focal length

102. The magnetic field lines inside a current carrying long solenoid are in the form of
(a) ellipse
(b) parabola.
(c) hyperbola.
(d) parallel straight lines.

103. A ray of light travelling from a rarer medium to a denser medium
(a) slows down and bends away from the normal.
(b) slows down and bends towards the normal.
(c) speeds up and bends away from the normal.
(d) speeds up and bends towards the normal.

104. An electric circuit is consisting of a cell, an ammeter and a nichrome wire of length l. If the length of the wire is reduced to half (l/2), then the ammeter reading
(a) decreases to one-half.
(b) gets doubled.
(c) decreases to one-third.
(d) remains unchanged.

105. What is the effect of pressure of a human body on sand ?
(a) Larger while standing than while lying
(b) Smaller while standing than while lying
(c) Same while standing or lying
(d) Larger while standing during the daytime and smaller during the night time while lying

106. An athlete completes one round of a circular track of diameter 100 m in 20 s. What will be the displacements after 1 minute and 10 s, respectively?
(a) Om, 50 m
(b) 300 m, 100 m
(c) 300 m, 50 m
(d) Om, 100 m

107. Which of the following statements about universal indicator is/are true ?
1. It is a mixture of several indicators.
2. It shows different colours at different concentrations of hydrogen ions in solution.
3. It helps to determine the strength of given acid and base in titration.
Select the correct answer using the code given below:
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3

108. Which of the following carbon allotropes is/are good conductor(s) of electricity ?
1. Diamond
2. Graphite
3. Fullerene
Select the correct answer using the code given below:
(a) 1 only
(b) 1 and 2 only
(c) 2 only
(a) 1 and 3 only

109. What is the approximate percentage of carbon in the Earth’s crust?
(a) 0.045%
(b) 0.025%
(c) 0.015%
(d) 0.005%

110. When copper reacts with moist carbon dioxide (CO2) in air, it forms a green coating of which one of the following compounds ?
(a) Cupric carbonate
(b) Cuprous oxide
(c) Cupric oxide
(d) Copper sulphate

111. What is the name of the process that converts sulphide ores into oxides by heating strongly in the presence of excess air?
(a) Calcination
(b) Roasting
(c) Smelting
(d) Incineration

112. What are the constituents of alloy solder?
(a) Pb and Zn
(b) Pb and Sn
(c) Pb and Si
(d) Pb and Co

113. Which of the following limits the number of trophic levels in a food chain ?
(a) Deficient food supply
(b) Polluted air
(c) Decrease in the available energy at higher trophic levels
(d) Parasitic organisms

114. In pea, a pure tall plant (TT) is crossed with a short plant (tt). What will be the ratio of pure tall plants to short plants in the F2 generation ?
(a) 1 : 1
(b) 1 : 3
(c) 3 : 1
(d) 2 : 1

115. Which one of the following statements about variations is not true?
(a) Variation is minimum in asexual reproduction.
(b) All variations in a species have equal chances of survival.
(c) Changes in genetic constitution result in variation.
(d) Variants can be selected by environmental factors.

116. While studying vegetation of an area, terms like ‘population’ and ‘community’ are often used. Which one of the following statements best describes a population ?
(a) A group of organisms of one species, living in the same area at the same time.
(b) A group of organisms of one species living in different areas during different seasons.
(c) A unit consisting of biotic and abiotic components.
(d) A group of organisms of more than one species, living in the same area at the same time.

117. In the human body, blood flows through a process of double circulation. Which one of the following statements is true in this regard ?
(a) Oxygenated blood reaches the left side of the heart from the lungs.
(b) Blood in the left side of the heart is poor in oxygen and is brought to the right side of the heart.
(c) Deoxygenated blood from the left side of the heart is brought to the lungs for oxygenation.
(d) Oxygenated blood from the right side of the heart is sent around the body.

118. In which of the following groups of organisms, is food material broken down outside the body and absorbed ?
(a) Yeast, mushroom, bread mould
(b) Mushroom, Amoeba, green plants
(c) Caserta, tapeworm, lice
(d) Paramecium, Amoeba, Caserta

119. A sound wave has a frequency of 4 kHz and wavelength 30 cm. How long will it take to travel 2-4 km?
(a) 2.0 s
(b) 0.6s
(c) 1.0s
(d) 8.0 s

120. An electric bulb is connected to a 110 V generator. The current is 0-2 A. What is the power of the bulb ?
(a) 0.22 W
(b) 2.2 W
(c) 22 W
(d) 220 W

 

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