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### Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess

Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess pressure inside them is

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(a) 1 : 1 (b) 5 : 3 (c) 2 : 3 (d) […]

### A black body is heated from 27° C to 127° C. The ratio of their energies of radiations

A black body is heated from 27° C to 127° C. The ratio of their energies of radiations emitted will be

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(a) 3 : 4 (b) 9 : 16 (c) 27 : […]

### A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid

A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid of specific gravity 1.5?

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(a) 65 grams (b) 45 grams (c) 30 […]

### The excess pressure inside one soap bubble is three times that inside a second soap bubble

The excess pressure inside one soap bubble is three times that inside a second soap bubble, then the ratio of their surface area is

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(a) 1 : 9 (b) 1 : 3 […]

### A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m

A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface of the liquid is

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(a) 0.75 N (b) […]

### Water rises to a height h in a capillary at the surface of earth. On the surface

Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be

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(a) […]

### The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force

The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force constant for iron is 7 N/m. The Young’s modulus of elasticity for iron is

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(a) 2.33 […]

### The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc

The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc. An ice berg of volume V is floating in sea water. The fraction of ice berg above water level is […]

### By sucking through a straw, a student can reduce the pressure of his lungs

By sucking through a straw, a student can reduce the pressure of his lungs to 750 nm of Hg (density = 13.6 g/cm³). Using the straw, he can drink water from a glass upto a […]

### Surface tension of a solution is 30 x 10⁻² N/m. The radius of the soap bubble is 5 cm

Surface tension of a solution is 30 x 10⁻² N/m. The radius of the soap bubble is 5 cm. The surface energy of soap bubble is

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(a) 1.8 x 10 J (b) […]

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