Science Master

A. Tectonic shift B. Epicenter C. Seismic wave D. Sound wave Solution: C Seismic waves are waves caused when earthquake occurs.  The waves are caused by sudden movement of materials within the Earth, such as slip along a fault during an earthquake. Volcanic eruptions can also cause seismic waves. Hence, option (C) is correct. Read more about Earthquake and its cause s.

  1. Psychology 2. Morphology 3. Forensic science 4. Kalology Solution: 3 Psychology is the study of mind and behaviour.  Morphology is a branch of biology that deals with the form and structure of plants and animals.  Forensic Science is the application of science to criminal and civil laws.  Kalology is the study of beauty, aesthetics.  Hence, option (3) is correct.  Read about Different Branches of Science .

A. Vitamin A and Vitamin D  B. Ascorbic acid and Vitamin D  C. Vitamin A and thymine  D. Ascorbic acid and vitamin D  Solution: A Vitamins that can dissolve in fats and oils are called fat-soluble vitamins. The fat-soluble vitamins are absorbed along with fats in the diet. They get stored in the fatty tissue of the body and liver for a long time. Fat-Soluble vitamins are Vitamin A, D, E and K.  While Vitamin B and C are water-soluble vitamins that are quickly absorbed with the excess being released.  Read more about Vitamins and Minerals . 

(1) 10.2 kW  (2) 8.1 kW  (3) 12.3 kW  (4) 7.0 kW Solution: (2) In the above question, height is given as 60 metres.  mass per unit time= 15 kg/s g= 10m/s 2 Loss due to frictional force is given as 10% of energy i.e. only 90% input is used to generate energy. P= mgh/t*0.9 P=10 x 60 x 15 x 0.9 = 8.1 kW Hence, option (2) is correct.  Read NCERT notes on Force and NCERT Notes on Friction . 

A. Hydrolase B. Catalase C. Lipase D. Cellulase Solution: C Lipase enzymes are used in the stabilisation of rice bran oil. Stabilisation of rice bran is important as it can become rancid during storage.  Enzymes are deactivated via proper stabilisation and maximum nutrients are retained. Thermal treatment is the most common method to stabilize rice bran. Rice bran is a by-product of milled rice. It contains many micronutrients like proteins, carbohydrates, oil, tocopherols, phytosterols, etc.   Hence, option (C) is correct. Read Biology Study Notes . 

A. Nitrogen B. Hydrogen C. Methane D. Oxygen Solution: C In landfills, waste is decomposed by the action of microorganisms that break down the organic matter. 90 to 98% of the gas released from landfills comprises of Methane and Carbon dioxide.  The remaining 2 to 10% includes nitrogen, oxygen, ammonia, sulfides, hydrogen and various other gases. Methane is also released from  oil and natural gas systems, paddy fields, coal mining, stationary and mobile combustion, wastewater treatment, and certain industrial processes. Hence, option (C) is correct. You can download CDS I 2022 Question Papers and Answer Key . 

A. Egg of Ostrich B. Nerve cell C. Bacteria D. Granule cell Solution: A Cell is the basic unit of life. The smallest cell is in bacteria which varies from 0.1 to 0.5 micrometres. The largest cell is the egg of the ostrich. In humans, the smallest cell is granule cell of Cerebellum which varies between 4 to 4.5 micrometres. The longest cell in human body is nerve cell. The largest cell in the human body is Ovum.  Hence, option (A) is correct.  Read NCERT Notes on Cell Structure and Functions .