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. A body is thrown vertically upwards with initial velocity 9.8 m/s. If the value of acceleration due to gravity is 9.8 m/s^2 then: 1. its velocity is reduced to 49 m per second after 5 seconds 2. it attains the maximum height of 980 m after 10 seconds 3. it attains a maximum height of 490 m in 5 seconds 4. it reaches ground after 10 seconds 2. A projectile covers the same horizontal distance when the initial angles of projection are: 1. 30 degree and 40 degree 2. 30 degree and 45 degree 3. 30 degree and 60 degree 4. 30 degree and 50 degree 3. A car covers the first half of the distance between two placed at 40 km/hr and other half at 60 km/hr: ...

Learn To Converge Your Dreams with Durgam Vigyan Sansthana Institute. 1. A particle of mass m moving with velocity 1 m/s collides perfectly elastically with another particle of mass 2m (at rest). If the incident particle is deflected by 90°, the heavy mass will make an angle with the initial direction of m, equal to: 1. 30 degree 2. 45 degree 3. 60 degree 4. 90 degree 2. A solid sphere of mass M, radius R and having moment of inertia about an axis passing through the centre of mass as I is recast into a disc of thickness t, whose moment of inertia about an axis passing through its edge and perpendicular to its plane remain 1. Then radius of disc is: 1. 8R/sqrt(5) 2. 4R/sqrt(5) 3. 2R/sqrt(15) 4. 6R/sqrt(15) 3. A thin rod of length 3L is bent at right angle from one end as sho...

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...