General Science Class 9 MCQs MCQs - General Science Practice | PakExamPoint
Practise General Science Class 9 MCQs MCQs in General Science. Attempt multiple-choice questions, check answers and revise related subtopics.
General Science Class 9 MCQs MCQs and revision practice
Study General Science Class 9 MCQs through multiple-choice questions in General Science. This subtopic contains 366 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.
Use these General Science Class 9 MCQs MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.
تالا اور کلیدی ماڈل کے بارے میں صحیح بیان کا انتخاب کریں؟
A. Enzyme and substrate posses' specific complementary geometric shapes
B. All above statements are correct
C. Active site continuously changes
D. Active site of enzyme is flexible
Check answer and explanation
Answer: Enzyme and substrate posses' specific complementary geometric shapes
Explanation The lock and key model proposes that the enzyme and substrate have specific, complementary geometric shapes that fit together perfectly , like a key fitting into a lock. This means that the active site of the enzyme is a rigid, pre-formed structure that perfectly complements the shape of the substrate.
Explanation A hypothesis is a testable prediction that explains a phenomenon or solves a problem. It's a crucial component of the scientific process, as it provides a framework for testing and experimentation.
پتوں کے نمکیات کے بارے میں مندرجہ ذیل میں سے کون سا سچ ہے؟
A. They emulsify fats in the duodenum
B. They increase the efficiency of pepsin action
C. They are manufactured by the pancreas
D. They are enzymes
Check answer and explanation
Answer: They emulsify fats in the duodenum
Explanation Bile salts are produced by the liver and stored in the gallbladder. They are released into the duodenum (the first part of the small intestine) to facilitate fat digestion.
Explanation The critical velocity (vc) is the minimum velocity an object must have to orbit the Earth without falling to the ground. It is given by the formula: vc = √(gR) where: g is the acceleration due to gravity (approximately 9.8 m/s²) R is the radius of the Earth (approximately 6,371 kilometers)
ایروبک سانس لینے کا مرحلہ مائٹوکونڈریا کے کرسٹے پر ہوتا ہے جسے _____ کہتے ہیں؟
A. Glycolysis
B. Kreb's cycle
C. C3 cycle
D. Electron transport chain
Check answer and explanation
Answer: Electron transport chain
Explanation The electron transport chain (ETC) is the stage of aerobic respiration that takes place at the cristae of mitochondria. The cristae are specialized infoldings of the mitochondrial inner membrane, where the ETC complexes are embedded.
Explanation Atomic radius decreases along a period as you move from left to right. This is because the number of protons in the nucleus increases, which pulls the electrons closer to the nucleus, resulting in a smaller atomic radius.
A. A fact based on quantitative data that is falsified
B. The same thing as an unproven theory
C. A verifiable observation
D. A tentative explanation that can be tested and is falsified
Check answer and explanation
Answer: A tentative explanation that can be tested and is falsified
Explanation A hypothesis is a proposed explanation for a phenomenon or a problem that can be tested through scientific investigation. It is a educated guess that provides a possible answer to a question or problem. A hypothesis must be testable and falsifiable , meaning that it can be proven or disproven through experimentation or data collection.
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