Engineering Questions — Physics
138 solved questions with detailed explanations
Q.47. An unpolarized light of intensity I passes through polarizer and then through a certain optically active solution and finally it goes to analyser. If the angle between analyser and polariser is
Q.44. Two radioactive substances A and B of mass numbers 200 and 212 respectively, shows spontaneous α-decay with same Q value of 1 MeV. The ratio of energies of α-rays produced by A and B is
Q.39. The maximum rated power of the LED is 2 mW and it is used in the circuit with input voltage of 5 V as shown in the figure below. The current through resistance is 0.5 mA. The minimum value of t
Q.41. The energy of an electron in an orbit of the Bohr's atom is eV where is the ground state energy. If L is the angular momentum of the electron in this orbit and h is the Planck's constant, then
Q.46. A copper wire of length 3 m is stretched by 3 mm by applying an external force. The volume of the wire is m³. The elastic potential energy stored in the wire in stretched condition would be J.
Q.29. The velocity(v) versus time (t) plot of a particle is shown in the figure, for a time interval of 40s. The total distance travelled by the particle and the average velocity during this period ar
Q.45. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A diode under reverse-biased condition provides very small current which is nea
Q.50. A diatomic gas () does 100 J of work when it is expanded isobarically. Then the heat given to the gas .......... J.
Q.30. A solid sphere of mass M and radius R is divided into two unequal parts. The smaller part having mass M/8 is converted into a sphere of radius r and the larger part is converted into a circular
Q.30. A planet (P) is moving around the star of mass in the orbit of radius . Another planet (P) is moving around another star of mass in a orbit of radius . Ratio of time periods of revolution of P