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Class 10
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🔬 10 Questions ⏱️ About 20 Minutes 🧠 Conceptual Challenge

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1. A 6 Ω resistor and a 3 Ω resistor are connected in parallel. This combination is connected in series with a 4 Ω resistor. What is the total resistance of the circuit? A. 2 Ω B. 6 Ω C. 7 Ω D. 13 Ω

2. An object is placed 30 cm in front of a concave mirror whose focal length is 15 cm. Where is the image formed? A. 15 cm behind the mirror B. 15 cm in front of the mirror C. 30 cm in front of the mirror D. At infinity

3. A current of 2 A flows through a 5 Ω resistor for 3 minutes. How much heat is produced? A. 600 J B. 1,800 J C. 3,600 J D. 7,200 J

4. An iron nail is placed in copper sulphate solution. A reddish-brown coating appears on the nail. Which statement explains this reaction? A. Copper displaces iron because copper is more reactive. B. Iron displaces copper because iron is more reactive. C. Iron and copper form a physical mixture. D. Copper sulphate decomposes only due to sunlight.

5. An element has the electronic configuration 2, 8, 7. Which statement about the element is correct? A. It belongs to Group 1 and tends to lose one electron. B. It belongs to Group 17 and tends to gain one electron. C. It belongs to Group 18 and is always highly reactive. D. It belongs to Group 2 and tends to gain two electrons.

6. Red litmus paper is dipped into an unknown solution and turns blue. What can be concluded? A. The solution is acidic. B. The solution is basic. C. The solution must be neutral. D. The solution must contain only water.

7. In a cross between two heterozygous tall pea plants (Tt × Tt), tallness is dominant over dwarfness. What is the probability of obtaining a dwarf plant? A. 0% B. 25% C. 50% D. 75%

8. Which sequence correctly describes the movement of blood from the right ventricle to the left ventricle through the lungs? A. Right ventricle → pulmonary artery → lungs → pulmonary veins → left atrium → left ventricle B. Right ventricle → aorta → lungs → vena cava → left ventricle C. Right ventricle → pulmonary veins → lungs → pulmonary artery → left atrium D. Right ventricle → vena cava → lungs → aorta → left ventricle

9. A destarched plant is exposed to sunlight after part of one leaf is covered with opaque paper. The leaf is later tested with iodine solution. What result is expected? A. Only the covered part turns blue-black. B. The uncovered part turns blue-black because starch is produced there. C. The entire leaf turns blue-black regardless of light exposure. D. Neither part can produce starch in sunlight.

10. Producers in an ecosystem contain 20,000 J of energy. Assuming the 10% law of energy transfer, how much energy is available to secondary consumers? A. 20,000 J B. 200 J C. 2,000 J D. 20 J

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Class 10 Science.

Challenge your scientific thinking.

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Turn curiosity into knowledge.

Class 10
Science.

Turn curiosity
into knowledge.