If h is the height of the capillary rise and r be the radius of capillary tube, then which of the following relation will be correct?
Options
(a) hr=constant (b) h/r²=constant (c) hr²=constant (d) […]
Ice is wrapped in black and white cloth. In which cases more ice will melt
Options
(a) White (b) Black (c) In both cases equal amount will melt (d) None of these
Correct Answer: […]
ln a surrounding medium of temperature 10⁰C a body takes 7 min for a fall of temperature from 60⁰C to 40⁰C. In what time the temperature of the body will fall from 40⁰C to 28⁰C? […]
When the temperature increases, the viscocity of
Options
(a) Gases decreases and liquid increases (b) Gases increases and liquids decreases (c) Gases and liquids increases (d) Gases and liquids decreases
Correct Answer:
Gases increases […]
In which of the following heat loss is primarily not due to convection?
Options
(a) boiling of water (b) land and sea breeze (c) heating of glass surface of a bulb due to current […]
Angle of contact of a liquid with a solid depends on
Options
(a) Solid only (b) Liquid only (c) Both on solid and liquid only (d) Orientation of the solid surface in liquid
Correct […]
A spherical body of emissivity e=0.6, placed inside a perfectly black body is maintained at temperature T then the energy radiated per second will be
Options
(a) E=0.4 eAT⁴ (b) E=0.8 eAT⁴ (c) E=0.6 […]
A cylindrical tank is filled with water to a level of 3m. A hole is opened at a height of 52.5 cm from bottom. The ratio of the area of the hole to that at […]
If two soap bubbles of different radii are connected by a tube
Options
(a) Air flows from the bigger bubble to the smaller bubble till the sizes become equal (b) Air flows from the […]
Application of Bernoulli’s theorem can be seen in
Options
(a) Dynamic lift of aeroplane (b) Hydraulic press (c) Helicopter (d) None of these
Correct Answer:
Dynamic lift of aeroplane
Explanation:
No explanation available. Be […]
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