Related MCQs

• Find the equivalent thermal resistance of combination of rods as shown in figure. Every rod has same length I and cross-sectional area A. Thermal conductivities are mentioned in figure.
• The ripple factor in a half wave rectifier is          [RPMT 2002]
• Assertion             :       Two persons on the surface of moon cannot talk to each other.  Reason                 :       There is no atmosphere on moon.
• A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is \[5.0\times {{10}^{-7}}\]m wide, the intensity of the electric field in this region is                                                        [UPSEAT 2002]
• The laptop PC?s modern electronic watches and calculators use the following for display
• The reason of current flow in P-N junction in forward bias is [RPMT 2000]
• The period of a simple pendulum is doubled, when                                         [CPMT 1974; MNR 1980; AFMC 1995; Pb. PET/PMT 2002]
• The period of oscillation of a simple pendulum of constant length at earth surface is T. Its period inside a mine is                    [CPMT 1973; DPMT 2001]
• Assertion             :       To protect any instrument from external magnetic field, it is put inside an iron body. Reason                 :       Iron is a magnetic substance.
• Two travelling waves \[{{y}_{1}}=A\sin [k(x-ct)]\] and\[{{y}_{2}}=A\sin [k(x+ct)]\]are superimposed on string. The distance between adjacent nodes is