Capillary action
Capillary action is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2013). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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खालील वाक्ये विचारात घ्या. वरीलपैकी कोणती वाक्ये बरोबर आहेत ?
(a)टीप कागद त्याचे कार्य करणार नाही.
(b)रॉकेलचा दिवा वापरणे अवघड होईल.
(c)सभोवताली दिसणारी झाडे पृथ्वीवर वाढणार नाहीत.
(d)शहरात नळाद्वारे पाणी वाहण्याची शक्यता नाही.
Blotting paper action, kerosene lamp functioning, and water transport in tall trees all rely on capillary action (surface tension/capillarity). If surface tension or related capillary properties were absent or hindered, blotting paper wouldn't absorb, kerosene lamps wouldn't draw oil, and trees couldn't transport water upwards against gravity.
पाण्याच्या थेंबाविषयी पुढे सर्वसाधारण विधाने आहेत : (a) पाण्याच्या थेंबाचा आकार गोलाकार असण्यास पृष्ठताण कारणीभूत आहे. (b) गुरुत्वाकर्षण नसतानाही पाण्याच्या थेंबाचा आकार गोल असतो. (c) जर पाण्याचे वस्तुमान ताणले गेले तर थेंब तयार होतात. वरीलपैकी कोणते/कोणती विधान/विधाने बरोबर आहे/आहेत ?
(a)Surface tension is responsible for the spherical shape of the water drops.
(b)Even in the absence of gravitation, water drops have spherical shape.
(c)Formation of water drops occurs, if mass of the water is stretched.
Surface tension minimizes the surface area of a liquid, giving water drops a spherical shape. This holds true even without gravity, and stretching liquid masses results in droplet formation.