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HPSC 2021 — Science & Technology Questions with Answers

All 10 Science & Technology previous-year questions from HPSC 2021, each with the correct answer and a full explanation. Practise them as a free, timed mock test with instant scoring.

1. Q1.Chemistry

   Which of the following statements are true about washing soda? 1. Its chemical name is sodium hydrogen carbonate and its aqueous solution is basic in nature. 2. Its chemical name is sodium carbonate and the pH of its aqueous solution is more than 7. 3. It is used for raising of cakes while baking. 4. It is used for removal of permanent hardness of water. Select the correct answer using the code given below:

   • a)2 and 3 only
   • b)2 and 4 only
   • c)1 and 3 only
   • d)2, 3 and 4 only
2. Q2.Chemistry

   The substances with pH less than 7 are: 1. Gastric Juices 2. Coffee 3. Apple Juice 4. Liquid in the car battery

   • a)1 and 2 only
   • b)1, 3 and 4 only
   • c)1, 2 and 3 only
   • d)All of these
3. Q3.Physics

   The best electrical conductor among the following is

   • a)Gold
   • b)Copper
   • c)Aluminium
   • d)Silver
4. Q4.Physics

   The depth of a sea can be determined by using SONAR. Consider the following statements about it: 1. It uses ultrasonic waves for measurement of depth of a sea. 2. The speed of ultrasonic waves in sea water is the same as that of sound in air. 3. Time taken by the Ultrasonic waves reflected from the bottom of the sea to reach the detector is used to measure the depth. Which of the above statement(s) is/are correct?

   • a)3 only
   • b)1 and 3 only
   • c)2 and 3 only
   • d)1, 2 and 3 only
5. Q5.Biology

   Match the diseases listed in Column 'A' with their symptoms in Column 'B' and select the correct option. Column A Column B

6. Q6.Human Biology

   A patient suffering from stomach pain and indigestion was advised by the doctor to take probiotics. The probiotics help to

   • a)Increase the effects of medication.
   • b)Kill harmful bacteria in the stomach.
   • c)Provide the beneficial bacteria for healthy digestion.
   • d)Decrease the acid secretion and increase the enzymatic activity.
7. Q7.Biotechnology

   Doctors recommended Real Time PCR test for COVID 19 patients. This diagnostic test detects

   • a)Complete Covid virus
   • b)Protein in virus
   • c)RNA of virus
   • d)Specific antigen of virus
8. Q8.Biotechnology

   Which of the following test is approved by Indian Council of Medical Research & does not require sample from nose or throat?

   • a)Reverse Transcription-Polymerase Chain Reaction Test
   • b)Rapid Antibodies Test
   • c)Rapid Antigen Test
   • d)TruNat Test
9. Q9.Information & Communication Technology

   Which of the following pairs is wrongly matched?

   • a)Tesla: Electric Car
   • b)Bitcoin: Crypto-currency
   • c)Pokemon Go: Augmented Reality Mobile Game
   • d)Zoom: OTT Streaming Platform
10. Q10.Space Exploration

    In February 2021, which NASA rover landed on Mars?

    • a)Perseverance
    • b)Curiosity
    • c)Hope
    • d)Viking