#ssc 10th
- The correct order of energy conversion in a coal-based thermal power plant is Answer: B. chemical → heat → kinetic → electrical Chemical energy of coal becomes heat (steam), the steam turns the turbine (kinetic), and t... 1
- Which of the following is NOT a source of green energy? Answer: B. Coal-based thermal power Burning coal releases CO₂ , sulphur oxides and fly ash, which harm the environment. 1
- Solar cells are commonly made from Answer: B. silicon Solar cells are mostly made from the semiconductor silicon. 1
- Fly ash is a pollutant mainly produced by Answer: D. coal-based thermal power plants Burning coal leaves fine ash particles (fly ash) that pollute air, water and soil. 1
- The addictive substance present in tobacco is Answer: D. nicotine Nicotine is the addictive chemical in tobacco. 1
- Long-term consumption of alcohol mainly damages the Answer: D. liver Alcohol abuse can cause cirrhosis of the liver. 1
- Chewing tobacco (gutkha, kharra) commonly leads to Answer: D. oral (mouth) cancer Chewing tobacco is a major cause of mouth cancer. 1
- World No Tobacco Day is observed on Answer: A. 31st May World No Tobacco Day is observed on 31st May. 1
- According to the World Health Organization, health is a state of complete Answer: D. physical, mental and social well-being WHO defines health as complete physical, mental and social well-being, not merely the abse... 1
- Excessive use of the internet, mobile phones and video games, to the extent that it disturbs daily life, is called Answer: D. cyber addiction Uncontrolled dependence on internet and gadgets is cyber addiction. 1
- Which of the following helps in managing stress? Answer: D. Yoga and meditation Yoga, meditation, exercise and talking to others help manage stress. 1
- Alcohol acts on the central nervous system as a Answer: A. depressant Alcohol slows down the central nervous system, affecting judgement and coordination. 1
- Breathing in the smoke from another person's cigarette is called Answer: D. passive smoking Passive smoking harms non-smokers who inhale the smoke. 1
- Social health mainly refers to a person's ability to Answer: A. build good relationships and adjust with others in society Social health is about healthy relations and interaction with family,... 1
- A solar cell converts Answer: C. solar energy into electrical energy Solar photovoltaic cells convert sunlight directly into electricity. 1
- The number of ATP molecules formed by complete aerobic oxidation of one molecule of glucose is Answer: A. 38 Complete oxidation of one glucose molecule through glycolysis, the Krebs cycle and the electron transport chain yields 38 ATP. 1
- The Krebs cycle (tricarboxylic acid cycle) takes place in the Answer: A. mitochondria The Krebs cycle occurs in the mitochondria. 1
- At the end of glycolysis, one molecule of glucose is converted into Answer: A. two molecules of pyruvic acid In glycolysis, glucose is broken down step by step into two molecules of pyruvic acid. 1
- Meiosis in one diploid cell produces Answer: C. four haploid cells Meiosis has two divisions and halves the chromosome number, giving four haploid cells. 1
- During strenuous exercise, anaerobic respiration in muscle cells produces Answer: D. lactic acid Without enough oxygen, pyruvic acid is converted to lactic acid in muscles, causing fatigue. 1
- In which phase of mitosis do the chromosomes arrange themselves on the equatorial plane of the cell? Answer: D. Metaphase In metaphase the chromosomes line up on the equatorial plane. 1
- Crossing over between homologous chromosomes takes place during Answer: B. prophase I of meiosis Crossing over occurs in prophase I of meiosis, when homologous chromosomes pair up. 1
- Amoeba reproduces asexually by Answer: B. binary fission Amoeba divides into two daughter cells by binary fission. 1
- Hydra reproduces asexually by Answer: C. budding A bud grows on the body of Hydra and develops into a new individual. 1