In the following question, out of four words given below, three are alike in some manner and fourth word is different. Find the d…

Question

In the following question, out of four words given below, three are alike in some manner and fourth word is different. Find the different one.

1. A. MICROSCOPE
2. B. TELESCOPE
3. C. STETHOSCOPE (Correct answer)
4. D. PERISCOPE

Correct Answer

Option C — STETHOSCOPE

Detailed Solution & Explanation

The correct answer is STETHOSCOPE.

Key Points

• This is a classic odd-one-out reasoning question based on classification of instruments. Microscope, telescope and periscope are all optical instruments — they work on the principles of light, lenses, mirrors and reflection, and each is used to see objects that the naked eye cannot: a microscope magnifies very small objects, a telescope brings distant celestial objects closer, and a periscope lets a submarine or a soldier in a trench see over an obstacle.
• A stethoscope, however, is an acoustic (sound-based) medical device.
• Invented by René Laennec in 1816, it is used by doctors to listen to internal body sounds such as the heartbeat, lung sounds and bowel movements — a process called auscultation.
• Because it works on sound and not light, it does not belong to the optical group, which makes it the odd one out.

प्रश्न (हिन्दी में)

निम्नलिखित प्रश्न में, नीचे दिए हुए चार शब्दों में तीन में एक प्रकार की समानता है तथा चौथा भिन्न है। भिन्न शब्द को ज्ञात करें।

1. A. सुक्ष्मदर्शी यन्त्र
2. B. दूरबीन
3. C. स्टैथोस्कोप (परिश्रावक)
4. D. परिदर्शी यंत्र