List of top Questions asked in JCECE- 2015

In the figure, the ball P is released from rest, when the spring is at its natural length. For the block Q of mass $2{{m}_{0}}$ to leave contact with ground at some stage, the minimum mass of P must be

A $50\,\Omega$ galvanometer is shunted by a resistance of $5\,\Omega .$ The percentage of the total current, which passes through the galvanometer is

The effective resistance across the points P and Q is

A disc of radius a and mass m is pivoted at the rim and is set in small oscillation. If a simple pendulum have the same period as that of the disc, then the length of the simple pendulum should be

An elliptically shaped ring of dimensions shown in figure just touches, the horizontal surface of a liquid of surface tension S. The force required to pull the ring away from the liquid surface is

A physical quantity X is represented by $X=[{{M}^{\eta }}{{L}^{-\theta }}{{T}^{-\text{o }\!\!|\!\!\text{ }}}].$ The maximum percentage errors in the measurement of M, L and T, respectively are $\alpha$ and $\gamma$ The maximum percentage error in the measurement of X will be

An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy $\frac{{{E}_{0}}}{4}.$ Its potential energy is

A plano-convex glass lens $({{\mu }_{g}}=3/2)$ of radius of curvature $R=20\text{ }cm$ is placed at a distance a from a concave lens of focal length 40 cm. What should be the distance b of a point object O from plano-convex lens so that the position of final image is independent of a?