General Ability (Part-2) NDA/NA Solved Paper 2020-ITotal Questions: 10091. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is(a) Reflection(b) Total internal reflection(c) Scattering(d) InterferenceCorrect Answer: (c) Scattering92. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?(a) The lens is concave and has a focal length of 0.5 metre(b) The lens is convex and has a focal length of 2.0 metre(c) The lens is convex and has a focal length of 0.5 metre(d) The lens is concave and has a focal length of 2.0 metreCorrect Answer: (c) The lens is convex and has a focal length of 0.5 metre93. At nearly 70°C, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is(a) Carbon dioxide(b) Hydrogen(c) Water vapour(d) OxygenCorrect Answer: (a) Carbon dioxide94. Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are(a) 5, 10 and 2 respectively(b) 10,2 and 5 respectively(c) 5,2 and 10 respectively(d) 2, 5 and 10 respectivelyCorrect Answer: (a) 5, 10 and 2 respectively95. Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?(a) Yellow - pink - blue(b) Yellow - reddish brown- yellow(c) Yellow- reddish brown - blue(d) Yellow-blue - pinkCorrect Answer: (b) Yellow - reddish brown- yellow96. Which one of the following statements regarding Bleaching powder and D.D.T. is correct?(a) Both are inorganic compounds(b) Both are organic compounds(c) Both contain chlorine(d) Both contain calciumCorrect Answer: (c) Both contain chlorine97. Which one of the following is the best example of desiccant?(a) Silica gel(b) Polystyrene(c) Sodium chloride(d) Sodium carbonateCorrect Answer: (a) Silica gel98. Which one of the following was the first mineral acid discovered?(a) Sulphuric acid(b) Hydrochloric acid(c) Nitric acid(d) Phosphoric ácidCorrect Answer: (c) Nitric acid99. The refractive index of fused quartz is 1.46 and that of sapphire is 1.77. If v is the speed oflight in quartz and vₛ is the speed of light in sapphire, then which one of the following relations is correct?(a)(b)(c)(d)Correct Answer: (a)100. In case of a concave mirror, if an object is kept between principal focus F and pole P ofthe mirror, then which one of the following statements about the image is NOT correct?(a) The image will be virtual(b) The image will be enlarged or magnified(c) The image will be formed at infinity(d) The image will be erectCorrect Answer: (c) The image will be formed at infinitySubmit Quiz« Previous12345678910
