221 On a clear day at noon the solar energy reaching the earth is ____________________? Physics Medium Full question → A 1.44kw/m2 B 1.4kw/m2 C 1 kw/m2 D none
222 The source of tidal energy is____________________? Physics Medium Full question → A sun B earth C both A and B D moon
223 The dot product of force and velocity is__________________? Physics Medium Full question → A power B work C impulse D torque
224 The dimension of power is_______________? Physics Medium Full question → A [ML2T-3] B [ML2T-2] C [ML2T3] D none of these
225 The work done by friction is__________________? Physics Medium Full question → A positive B negative C zero D none of these
226 An alternating current or voltage_____________________? Physics Medium Full question → A fluctuates off and on B varies in magnitude alone C changes its direction again and again D changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals
227 A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ? Physics Medium Full question → A 4 volt B 5 volt C 2 volt D 0.4 volt
228 Heating a magnet will ____________________? Physics Medium Full question → A weaken it B strengthen it C reverse its polarity D demagnetize it completely
229 Galvanometer is a very sensitive device with______________________? Physics Medium Full question → A very low damping B very high damping C no damping at all D radial field disintegration
230 When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________? Physics Medium Full question → A a straight line parallel to the field B a parabola in a plane perpendicular to the field C a circle in a plane perpendicular to the field D a straight line along its initial direction
231 The effective way to increase the sensitivity of a moving coil galvanometer is to___________________? Physics Medium Full question → A use a very long and fine suspension B use a coil of very large area C use a coil with very large number of turns D use a very strong magnetic field
232 An ammeter measures the total current flowing through a circuit when it is connected__________________? Physics Medium Full question → A in series with the circuit B in parallel with circuit C in series with any of the parallel resistances in the circuit D in parallel with any of the series resistances in the circuit
233 While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________? Physics Medium Full question → A a most sensitive galvanometer is used B a steady voltage cell is used C the balance point is close to the middle of the wire D a high resistance box is used in one of its gap
234 Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________? Physics Medium Full question → A 0.1 A B 1:00 AM C current sensitivity D 1 m A
235 The sensitivity of a galvanometer is given by__________________? Physics Medium Full question → A C/BAN B CAN/B C BAN/C D ABC/N
236 The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________? Physics Medium Full question → A 18Ω B 30Ω C 24Ω D 12Ω
237 The magnetic field strength of solenoid is__________________? Physics Medium Full question → A B = μNI B B = μN/I C B = μnI D Both B and C
238 Value of permeability of free space in SI units is___________________? Physics Medium Full question → A 4πx10-9 WbA-1m-1 B 4πx10-7 WbA-1m-1 C 4πx10-10 WbA-1m-1 D 4πx10-8 WbA-1m-1
239 The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________? Physics Medium Full question → A a circle B a spiral C an ellipse D helix
240 Magnetic flux and flux density are related by___________________? Physics Medium Full question → A magnetic flux = flux density / area B magnetic flux = flux density x area C flux density = magnetic flux area D flux density = magnetic flux x area