Durgam Vigyan Sansthana

1.The excess pressure inside a bubble of radius R are completely dipped inside the liquid of surface tension S is 1. 2S/r 2. 4S/r 3. 2Sr 4. S/2r 2. If a liquid wets the glass surface the free surface of liquid in the glass capillary will be: 1. Plane 2. Convex 3. Concave 4. All of the above 3. With the rise in temperature the surface tension of a liquid: 1. Increases 2. Decreases 3. Increases or decreases depending upon liquid 4. Doesn't change 4. Two spherical soap bubbles of diameter 10 cm and 6 cm respectively, are formed at the end of a narrow horizontal tube. Pressure difference between the ends of the tube is (surface tension of the soap = 3 x 10^(-2) N/m): 1. 1.6 N.m^(-2) 2. 7.6 N.m^(-2...

PGT Physics Mock Test By DVS. Learn To Converge Your Dreams with Durgam Vigyan Sansthana Institute. Subscribe me on Youtube 1. According to Einstein mass-energy relation, one gram of matter is equivalent to cnergy of 1. 9 x 10^13 J 2. 9 x 10^14 J 3. 1 x 10^13 J 4. 6 x 10^13 J 2. If 3.6 gm of a matter is converted completely into energy, the electricity that could be obtained from is shall be: 1. 9 x 10^6 kWh 2. 1 x 10^7 kWh 3. 9 x 10^7 kWh 4. 9 x 10^8 kWh 3. If the speed of light were 2/3 of its present value, the energy released in a given in an atomic explosion 1. decreased by a factor of 2/3 2. decreased by a factor of 4/9 3. decreased by a factor of 5/9 4. decreased by a factor of 1/3 4. The sun radiate...