UPSC CDS I Answer Key 16 April 2023 | UPSC CDS 1 2023 GK Answer Key

Q21. A sprinter feels cramps and pain in the thigh muscles after a run. This is due to accumulation of
(a) lactic acid
(b) CO2
(c) pyruvic acid
(d) ethanol

Q22. A leaf was plucked from a plant on a sunny day and kept for 2 minutes. in boiling water. It was subsequently immersed in boiling alcohol and treated with iodine solution. What will be the final colour of the leaf after the test?
(a) Colourless
(b) Green
(c) Blue
(d) White

Q23. If the red blood cells (RBCs) of human blood are isolated and are diluted in normal saline (an isotonic solution to blood), what will happen to the RBCs?
(a) The RBCs will swell
(b) The RBCs will swell and burst
(c) The RBCs will shrink
(d) No change in the diameters of the RBCs

Q24. Which one of the following statements regarding bile secreted by liver is not correct?
(a) Bile contains enzymes for digestion/ of lipids.
(b) Bile facilitates emulsification of fats.
(c) Bile neutralizes the acidic pH of the food coming from stomach.
(d) Bile makes the pH of the food alkaline and facilitates action of pancreatic enzymes.

Q25. The blood pressure of a normal human being is found to be 120/80 mmHg. These numbers’ represent the blood pressure at
(a) ventricular contraction and ventricular relaxation, respectively
(b) ventricular relaxation and ventricular contraction, respectively
(c) auricular contraction and auricular relaxation, respectively
(d) ventricular contraction and auricular contraction, respectively

Q26. A person burned a firecracker in front of a cliff and heard its echo 5 s after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to
(a) 1700 m
(b) 170 m
(c) 85 m
(d) 850 m

Q27. Consider the following statements about the microphone and the speaker of a mobile phone :

1. The microphone converts sound to a mechanical signal.
2. The microphone converts sound to an electrical signal.
3. The speaker converts a mechanical signal to sound.
4. The speaker converts an electrical signal to sound.
   Which of the statements given above are correct?
   (a) 1 and 3
   (b) 1 and 4
   (c) 2 and 3
   (d) 2 and 4

Q28. A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days? (1 unit = 1 kWh)
(a) 3.00
(b) 1.08
(c) 2.16
(d) 0.33

Q29. The area under the velocity-time graph for a particle moving in a straight line with uniform acceleration gives
(a) its average velocity
(b) its net displacement
(c) the distance travelled by it
(d) its average speed

Q30. The power of a lens of focal length 10 cm is
(a) 0.1 dioptre
(b) 1 dioptre
(c) 10 dioptre
(d) 100 dioptre

Q31. Consider the following statements regarding burning of magnesium ribbon in air :

1. White powder of MgO is formed.
2. It is an example of combustion reaction.
3. Heat and light are produced.
   Which of the statements given above are correct?
   (a) 1 and 2 only
   (b) 1 and 3 only
   (c) 2 and 3 only
   (d) 1, 2 and 3

Q32. Which of the following statements with regard to the reaction given below are correct?
CaO (s) + H2O(l) → Ca(OH)2 (aq) + Heat

1. Quicklime is used for white- washing of walls.
2. The solution of slaked lime is used for whitewashing of walls.
3. CaO reacts slowly with CO2 in air to form a thin layer of CaCO3 on walls.
4. Calcium hydroxide called ‘slaked lime’ is an inorganic compound.
   Select the correct answer using the code given below.
   (a) 1 and 4 only
   (b) 2 and 4
   (c) 2 and 3
   (d) 1, 3 and 4

Q33. Which of the following statements with regard to heating of lead nitrate powder over a flame are correct?

1. Brown fumes of NO are released.
2. Colourless O2 gas is released.
3. It is an example of oxidation reaction.
4. It is an example of thermal decomposition used production of NO2 gas.
   Select the correct answer using the code given below.
   (a) 1 and 2
   (b) 2, 3 and 4
   (c) 1, 3 and 4
   (d) 2 and 4 only

Q34. Which one of the following is not an oxidation reaction?
(a) Rusting of iron
(b) Opening of soda bottle
(c) Rancidity
(d) Combustion

Q35. Consider the following clues about a State of India :

1. It is known as ‘land of red river and blue hills’.
2. It contains three of the six physiographic divisions of India.
3. It covers about 2.39 percent of total areas of the country.
   Identify the State on the basis of the given clues.
   (a) Karnataka
   (b) Andhra Pradesh
   (c) Assam
   (d) Chhattisgarh

Q36. Which of the following sets of States shares boundary with Telangana?
(a) Odisha, Andhra Pradesh, Karnataka, Maharashtra
(b) Chhattisgarh, Andhra Pradesh, Karnataka, Madhya Pradesh
(c) Odisha, Andhra Pradesh, Karnataka, Madhya Pradesh
(d) Chhattisgarh, Andhra Pradesh, Karnataka, Maharashtra

Q37. Rani told her friends that last year she did boating in four different lakes, namely, Loktak, Barapani, Kolleru and Pulicat. Which of the following States did she visit?
(a) Manipur, Meghalaya, Kerala, Tamil Nadu
(b) Manipur, Meghalaya, Andhra Pradesh, Tamil Nadu
(c) Mizoram, Assam, Kerala, Tamil Nadu
(d) Mizoram, Assam, Andhra Pradesh, Tamil Nadu

Q38. According to the Census 2011, which of the following statements is/are correct?

1. A person who can only read but cannot write, is not literate.
2. A person aged seven years and above, who can both read and write with understanding in any language is treated as literate.
   Select the correct answer using the code given below.
   (a) 1 only
   (b) 2 only
   (c) Both 1 and 2
   (d) Neither 1 nor 2

Q39. The Tropic of Cancer passes through how many coastal and landlocked States of India, respectively?
(a) 1 and 7
(b) 2 and 6
(c) 2 and 5
(d) 3 and 5

Q40. Which one of the following situations can lead to inflation?
(a) Rapid growth of aggregate demand outweighing supply
(b) Sluggish demand growth of aggregate
(c) Reduction in the money supply
(d) Higher levels of unemployment