UPSC NDA I Exam 2019 – General Aptitude Test Part – B (Answer Key)

91. Spring tides refer to
(a) greatest difference in the sea level at high and low tides
(b) lowest difference in the sea level at high and low tides
(c) no difference in the sea level at high and low tides
(d) counteraction of gravitational pull of the Sun to that of Moon

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92. Which one of the following energy is stored in the links between the atoms?
(a) Nuclear energy
(b) Chemical energy
(c) Potential energy
(d) Thermal energy

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93. The light energy escaping from the Sun can be spread by
(a) a shower of rain drops
(b) a plane mirror
(c) a convex lens
(d) a combination of a convex lens and a concave lens

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94. The correct sequence of energy transfer that occurs when an apple falls to the ground is
(a) Gravitational potential energy → heat energy to air → kinetic energy → heat energy to ground and apple → sound energy
(b) Gravitational potential energy → sound energy → kinetic energy → heat energy to air → heat energy to ground and apple
(c) Gravitational potential energy → kinetic energy → sound energy → heat energy to air → heat energy to ground and apple
(d) Gravitational potential energy → kinetic energy → sound energy → heat energy to air → heat energy to ground and apple

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95. Which one of the following minerals is used as a fuel in nuclear power stations?
(a) Bauxite
(b) Quartz
(c) Feldspar
(d) Pitchblende

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96. Which one of the following is NOT a synthetic detergent ?
(a) CH₃(CH₂)₁₀CH₂O SO₃^–Na⁺
(b) [CH₃(CH₂)₁₅-N-(CH₃)₃]⁺ Br^–
(C) CH₃(CH₂)₁₆ COO^–Na⁺
(d) CH₃(CH₂)₁₆ COO(CH₂CH₂O)_nCH₂CH₂OH

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97. Which one of the following is an example of a clean fuel ?
(a) Coke
(b) Propane
(c) Petrol
(d) Wax

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98. Which one of the following metals does NOT react with cold water ?
(a) Calcium (Ca)
(b) Potassium (K)
(c) Magnesium (Mg)
(d) Sodium (Na)

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99. In which of the following pairs are the ions isoelectronic ?
(a) Mg²⁺, Ar
(b) Na⁺, O^2-
(c) Al3⁺, Cl^–
(d) K⁺, Ne

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100. Which one of the following is used as a binder in paints ?
(a) Titanium dioxide
(b) Novolac
(c) Phthalocyanine
(d) Silicones

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101. The Sun is seen little before it rises and for a short while after it sets. This is because of
(a) total internal reflection
(b) atmospheric refraction
(c) apparent shift in the direction of Sun
(d) dispersion

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102.

The figure shown above gives the time (t) versus position (x) graphs of three objects A, B and C. Which one of the following is the correct relation between their speeds V_A , V_B and V_C, respectively at any instant (t > 0) ?
(a) V_A < V_B < V_C
(b) VA > V_B > V_C
(c) V_A = V_B = V_C ≠ 0
(d) V_A = V_B = V_C = 0

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103. 1 dyne (a unit of force in CGS system, equals to
(a) 10³ g cm/s²
(b) 10^-3 g cm/s²
(C) 10⁵ kg m/s²
(d) 10^-5 kg m/s²

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104.

In the given velocity (V) versus time (t) graph, accelerated and decelerated motions are respectively represented by line segments
(a) CD and BC
(b) BC and AB
(c) CD and AB
(d) AB and CD

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105. Which one of the following statements regarding a thermos flask is NOT correct?
(a) The walls of flask are separated by vacuum and made of glass which is a poor conductor of heat
(b) The glass walls themselves have shiny surfaces
(c) The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner wall.
(d) The cork supports conductors of heat are poor

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106. ‘Black hole’ is a
(a) huge black star which has zero acceleration due to gravity on its surface
(b) star which has moderate acceleration due to gravity on its surface
(c) star which has collapsed into itself and has large acceleration due to gravity on its surface
(d) star which has collapsed into itself and has zero acceleration due to gravity on its surface

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107. The formula for conversion between Fahrenheit and Celsius is
°F = X + (1.8x°C)
What is factor X?
(a) 32
(b) 22
(c) 98
(d) 42

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108. When a beam of white light passes through a glass prism, the colour of light beam that deviates the least is
(a) Blue
(b) Red
(c) Green
(d) Violet

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109. LIGO stands for
(a) Laser Interferometer Gravitational wave Observatory
(b) Light Interferometer Gravitational wave Observatory
(c) Light Induced Gravity Observatory
(d) Laser Induced Gaseous Optics

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110. A fuse wire must be
(a) conducting and of low melting point
(b) conducting and of high melting point
(c) insulator and of high melting point
(d) insulator and of low melting point

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