Science Master

A. Femur  B. Malleus  C. Stapes  D. None of the above  Solution: C  Stapes bone present in the ear is the smallest bone in human body. Femur is the longest bone in human body. Hence, option (c) is correct. 

A. Liver B. Pancreas  C. Thyroid D. Hypothalamus Solution: A Liver is the largest gland of human body. Liver is a spongy mass of wedge-shaped lobes that has many metabolic and secretory functions. It is located on the right side of the abdomen. Hence, option (A) is correct.  Watch explanation of this question here . 

A. Precipitation B. Condensation C. Transpiration D.  Evaporation Solution: A Rain, hail, and snow are the three most common types of precipitation. Rain: Rain is a type of precipitation that occurs when water droplets fall to the surface of the Earth. When rain falls from the clouds, but freezes before it reaches the ground, it is referred to as ice pellets or sleet. Hail: Hail forms in the clouds of a cold storm. It forms when droplets of very cold-water freeze, or turn solid, as soon as they touch things like dust or dirt. Snow: Snow is the type of precipitation that falls in the form of ice crystals. The ice crystals are formed individually in clouds, but when they fall, they stick together in clusters of snowflakes. Hence, (A) is the correct answer. Read Geography Study Material important for the preparation for NDA 2023 exam. Visit UPSC website for updates regarding NDA exam.

A. seeds   B. roots C. fruits D. flowers Solution: B Pneumatophores are specialized root structures that grow out from the water surface and facilitate the aeration necessary for root respiration in hydrophytic trees.  Such hydrophytic trees are mangrove species, bald cypresses, and cotton gum. Hence, option (B) is correct.

A. Ovary B. Kidney C. Liver D. Testis Solution: D Sertoli cells are found in the seminiferous tubule of the Testis. It helps in the process of production of sperm. The cells are activated by FSH hormone secreted by adenohypophysis and has FSH receptor on its membranes. These cells are required for male sexual development. Hence, option (D) is correct.  Read about Human Reproduction in NCERT Class 12 Chapter 3 .

A. Chlorofluorocarbon B. Carbon Dioxide C. Argon D. Methane Solution: C Greenhouse gases lead to greenhouse effect wherein the gases absorb the infrared radiation emitted by earth (after absorption of solar radiation reaching its surface) thereby increasing its temperature. Greenhouse effect is necessary but the rising concentrations of greenhouse gases due to human activities has caused great alarm.  The main greenhouse gases are- Carbon dioxide, Methane, Nitrous oxide, Hydrofluorocarbons, Ozone, HCFCs, etc.  Hence, option (C) is correct. Check out official Answer key of UPPCS Prelims 2022 Exam . 

A. Liver B. Brain C. Heart D. Kidney Solution: A Hepatitis A is an inflammation of the liver that is caused by hepatitis A virus. Hepatitis A is a highly contagious, short-term liver infection. In rare cases, it can cause liver failure and even death. It can spread from the infected person when in personal contact or through contaminated food or drink. Symptoms usually appear 2 to 7 months after infection. Some of the symptoms are: Yellow skin or eyes Loss of appetite and Upset stomach Vomiting and Stomach pain Fever Dark urine or light- colored stools Diarrhea Joint pain Feeling tired Hence, option (A) is correct.