AIPMT NEET 2014 Mock Test

A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = $5.98\times 10^{24}\text{kg}$) have to be compressed to be a black hole?

Dependence of intensity of gravitational field ($E$) of earth with distance ($r$) from centre of earth is correctly represented by:

Copper of fixed volume ‘V’ is drawn into wire of length ‘$l$ ’. When this wire is subjected to a constant force ‘F’, the extension produced in the wire is ‘$\Delta l$ ’. Which of the following graphs is a straight line?

A certain number of spherical drops of a liquid of radius ‘r’ coalesce to form a single drop of radius ‘R’ and volume ‘V’. If ‘T’ is the surface tension of the liquid, then:

Steam at $100^{\circ }\text{C}$ is passed into $20\text{g}$ of water at $10^{\circ }\text{C}$. When water acquires a temperature of $80^{\circ }\text{C}$, the mass of water present will be: [Take specific heat of water $=1{\text{cal g}}^{-1}{}^{\circ }{\text{C}}^{-1}$ and latent heat of steam $=540{\text{cal g}}^{-1}$ ]