321 The direction of propagation of an electromagnetic waves is________________? Physics Medium Full question → A Perpendicular to electric field B Perpendicular to both electric and magnetic field C Perpendicular to magnetic field D Parallel to electric and magnetic field
322 A changing magnetic flux produces around itself an induced_______________? Physics Medium Full question → A Magnetic field B Electric field C Electromagnetic force D Artificial gravitational field
323 An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ? Physics Medium Full question → A 20A B 20.66A C 6.66A D 5.66A
324 The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________? Physics Medium Full question → A Average current B Sinusoidal current C r.m.s current D Net current
325 If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________? Physics Medium Full question → A Twice B One half C Four times D None
326 Waves emitted from the antenna are__________________? Physics Medium Full question → A Sound waves B Electromagnetic waves C Radio waves D Modulated waves
327 An electromagnetic wave consists of _____________________? Physics Medium Full question → A Electric and magnetic fields moving parallel to each other B Magnetic field moving with velocity of light in space C Electric field moving with velocity of light D Electric and magnetic fields moving perpendicular to each other
328 Electromagnetic waves travel in free space with the speed of___________________? Physics Medium Full question → A λ-rays B Positive rays C Cathode rays D More than sound waves
329 The unit of radioactivity curie is equal to________________? Physics Medium Full question → A 3.74 x 109 disintegration per sec B 3.70 x 1010 disintegration per sec C 3.55 x 1010 disintegration per sec D 3.60 x 1010 disintegration per sec
330 The unit of radioactivity curie is equal to_________________? Physics Medium Full question → A 3.74 x 109 disintegration per sec B 3.70 x 1010 disintegration per sec C 3.55 x 1010 disintegration per sec D 3.60 x 1010 disintegration per sec
331 An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ? Physics Medium Full question → A 224 – 84 B 220 – 80 C 222 – 86 D 226 – 87
332 Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is______________? Physics Medium Full question → A Smaller B Greater than 82 C Same D Sometimes smaller some times greater
333 A mass spectrograph (spectrometer) sorts out____________? Physics Medium Full question → A Molecules B Ions C Elements D Isotopes
334 Nuclei having the same mass number but different atomic number are____________? Physics Medium Full question → A Isotopes B Isobars C Isotones D Isomers
335 Mass of neutron is________________? Physics Medium Full question → A 1.67 x 10-31 kg B 1.67 x 10-27 kg C 9.1 x 10-31 kg D 1.67 x 10-19 kg
336 A particle having the mass of an electron and the charge of a proton is called a______________? Physics Medium Full question → A Antiproton B Positron C Gamma rays D Photon
337 The charge on neutron is_______________? Physics Medium Full question → A Plus 1.6 x 10-19C B Zero C Minus 1.6 x 10-19C D No definite charge
338 The charge on an electron was determine by ________________? Physics Medium Full question → A Ampere B Maxwell C Millikan D Thomson
339 Which one of the following radiations possesses maximum velocity ? Physics Medium Full question → A α-rays B β-rays C γ-rays D All of above have the same speed
340 The fission chain reaction in a nuclear reactor can be controlled by introducing _______________? Physics Medium Full question → A Iron rods B Graphite rods C Cadmium rods D Platinum rods