General Science Class 7 MCQs MCQs - General Science Practice | PakExamPoint

Practise General Science Class 7 MCQs MCQs in General Science. Attempt multiple-choice questions, check answers and revise related subtopics.

General Science Class 7 MCQs MCQs and revision practice

Study General Science Class 7 MCQs through multiple-choice questions in General Science. This subtopic contains 255 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 7 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.

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General Science Class 7 MCQs: questions and answer review

Try each question before opening its answer. Record the concept behind each mistake and revisit it during your next practice session.

141. Which one among the following is not a chemical change? Melting of ice, Burning of fuel, Explosion of firework, Cooking raw food

مندرجہ ذیل میں سے کون سی کیمیائی تبدیلی نہیں ہے؟

Check answer and explanation

Answer: Melting of ice

Explanation Melting of ice is a physical change , as it only involves a change in state (from solid to liquid) without a change in chemical composition. The examples of chemical changes: Burning of fuel Explosion of firework Burning of wood Cooking of food (breakfast, lunch, dinner) Bursting of crackers Burning of wax Rusting of iron Heating sulphur with iron fillings (to produce iron sulphide) Digestion of food Respiration in living things Photosynthesis in plants Last verified on 09-03-026

142. Which is a water purification technology that uses a semipermeable membrane to remove ions, molecules and larger particles from drinking water?

کون سی پانی صاف کرنے والی ٹیکنالوجی ہے جو پینے کے پانی سے آئنوں، مالیکیولز اور بڑے ذرات کو ہٹانے کے لیے نیم پارمیبل جھلی کا استعمال کرتی ہے؟

Check answer and explanation

Answer: Reverse Osmosis (RO)

Explanation Reverse Osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water. This membrane has tiny pores that allow water molecules to pass through, but block larger particles and impurities.

143. Absorption only occurs in ____?

جذب صرف ____ میں ہوتا ہے؟

Check answer and explanation

Answer: Small Intestine

Explanation The small intestine, also known as the small bowel, is the primary site of nutrient absorption in the human body. The walls of the small intestine are lined with finger-like projections called villi , which increase the surface area for absorption. Nutrients like carbohydrates, proteins, fats, vitamins , and minerals are absorbed into the bloodstream through the small intestine.

144. The fundamental frequency of a guitar is string 220 Hz, the frequency of the second harmonic is?

گٹار کی بنیادی فریکوئنسی سٹرنگ 220 ہرٹز ہے، دوسرے ہارمونک کی فریکوئنسی کیا ہے؟

Check answer and explanation

Answer: 440 Hz

Explanation The frequency of the second harmonic is twice the fundamental frequency. Fundamental frequency = 220 Hz Second harmonic frequency = 2 × 220 Hz = 440 Hz

145. The SI unit of electric current is _____?

برقی رو کی ایس۔آئی یونٹ _____ ہے؟

Check answer and explanation

Answer: Ampere

Explanation The ampere , symbol A , is the SI unit of electric current. It is defined by considering the fixed value of the elementary charge e as 1.602 176 634 x 1019, where the unit C is equal to As and the second is defined by Δν Cs.

146. The hindrance to the flow of current is called?

کرنٹ کے بہاؤ میں رکاوٹ کو ____ کہتے ہیں؟

Check answer and explanation

Answer: Resistance

Explanation Resistance (C) is the opposition to the flow of electric current. It is measured in ohms (Ω).

147. An atom has atomic number 16 and mass number 32, the number of protons is?

ایک ایٹم کا ایٹم نمبر 16 اور ماس نمبر 32 ہے، پروٹون کی تعداد کیا ہے؟

Check answer and explanation

Answer: 16

Explanation The atomic number (Z) is the number of protons in the nucleus of an atom. In this case, the atomic number (Z) is 16 , which means the number of protons is 16.

148. Total internal reflection of light is possible when light enters from ____?

جب روشنی ____ سے داخل ہوتی ہے تو روشنی کا مکمل اندرونی انعکاس ممکن ہے؟

Check answer and explanation

Answer: Water to air

Explanation Total internal reflection occurs when light travels from a denser medium to a rarer medium . The angle of incidence must be greater than the critical angle for the two media. Light is completely reflected back into the denser medium instead of refracting . Common examples: optical fibers, diamonds, and mirages. Last verified on 17-03-2026

149. Examples of _______ properties involved melting, transition to a gas, change of durability and changes to crystal form.

خصوصیات کی مثالوں میں پگھلنا، گیس میں منتقلی، استحکام کی تبدیلی اور کرسٹل کی شکل میں تبدیلی شامل ہے۔ _____

Check answer and explanation

Answer: Physical

Explanation A change in physical appearance or state of a substance , such as a change in shape, size, color, or phase (solid, liquid, gas), is called a Physical Change. The are examples of Physical Changes: Melting (ice cream, wax, chocolate, ice and change from solid to liquid ) Phase changes ( boiling, freezing, condensation ) Crushing (chalk) Tearing (paper) Crumpling (aluminium foil) Stretching (rubber band) Mixing (sugar in water) Dissolving (sugar, salt in water) Moulding (clay, metals) Slicing (fruit) Forming of frost (from water vapors) Transition to a gas (change from liquid to gas) Change of durability (change in texture or strength) Changes to crystal form (change in crystal structure) Last verified on 17-03-2026

150. Which isotope is used to identity efficiency rates of organic and inorganic fertilizers?

نامیاتی اور غیر نامیاتی کھادوں کی کارکردگی کی شرح کی شناخت کے لیے کون سا آئسوٹوپ استعمال کیا جاتا ہے؟

Check answer and explanation

Answer: Nitrogen - 15

Explanation Phosphorus-32 is used to identify the efficiency rates of organic and inorganic fertilizers. It is a radioactive isotope that helps track the uptake and utilization of phosphorus by plants.

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