MCQOPTIONS
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MCQOPTIONS
This section includes 317 Mcqs, each offering curated multiple-choice questions to sharpen your UPSC IAS Exam knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Which of the following statement is/are the applications of photovoltaic cells? A. They are used to detect opacity of solids, defects materials. B. They are used to switch on and off the street automatically C. They are used to compare illuminating power of two sources. D. To control temperature in furnaces and chemical reactions |
| A. | B and C |
| B. | B, C, D |
| C. | A, B, C |
| D. | All of these |
| Answer» E. | |
| 302. |
Which among the following statements are the requirements of good source of energy? A. It should do a large amount of work per unit volume or mass. B. It should be easily accessible. C. It should be easy to store and transport. D. It should be economical. |
| A. | A, B |
| B. | A, B, C |
| C. | B, C, D |
| D. | All of these generator. |
| Answer» E. | |
| 303. |
Tidal energy is a |
| A. | form of energy obtained from kinetic energy of moving ocean water |
| B. | form of energy which is obtained from the river in the form of tidal waves |
| C. | form of energy which is obtained from the lake in the form of tidal waves |
| D. | form of energy which is obtained from the ocean in the form of tidal waves. |
| Answer» E. | |
| 304. |
Geothermal energy is |
| A. | energy of magma inside the earth crust |
| B. | energy stored as heat in the earth |
| C. | amount of energy obtained from coal and petroleum inside earth crust. |
| D. | amount of minerals obtained from earth crust |
| Answer» C. amount of energy obtained from coal and petroleum inside earth crust. | |
| 305. |
Solar cells generate little amount of electricity, but are becoming popular because |
| A. | its raw material Silicon is available in large quantities in India |
| B. | it can be set up in remote and inaccessible hamlets without laying transmission lines |
| C. | electricity generated from solar cells can be stored and used when required |
| D. | All of these |
| Answer» E. | |
| 306. |
If an a-particle is projected normally through a uniform magnetic field, then the path of the a-particle inside the field will be [NDA] |
| A. | circular |
| B. | parabolic |
| C. | elliptical |
| D. | a straight line |
| Answer» B. parabolic | |
| 307. |
Electromagnetic radiations are emitted by which of the following? [NDA] |
| A. | Only by radio and television transmitting antennas |
| B. | Only by bodies at temperature higher than their surroundings |
| C. | Only by red-hot bodies |
| D. | By all bodies |
| Answer» E. | |
| 308. |
The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as |
| A. | Transmission |
| B. | Reception |
| C. | Modulation |
| D. | Detection |
| Answer» D. Detection | |
| 309. |
Which one among the following radiations carries maximum energy? [NDA] |
| A. | Ultraviolet rays |
| B. | Gamma-rays |
| C. | X-rays |
| D. | Infra-red rays |
| Answer» C. X-rays | |
| 310. |
The most familiar form of radiant energy in sunlight that causes tanning and sun burning of human skin, is called [CDS] |
| A. | ultraviolet radiation |
| B. | visible radiation |
| C. | infrared radiation |
| D. | microwave radiation |
| Answer» B. visible radiation | |
| 311. |
Which one of the following is the correct sequence of the wavelengths of radiations? [NDA] |
| A. | UV > Green> IR > Hard X-rays |
| B. | IR > Green> UV > Hard X-rays |
| C. | UV > Hard X-rays> IR > Green |
| D. | IR > Hard X-rays> Green> UV |
| Answer» C. UV > Hard X-rays> IR > Green | |
| 312. |
Repeaters used in telephone links are: [NDA] |
| A. | Rectifiers |
| B. | Oscillators |
| C. | Amplifiers |
| D. | Transformers |
| Answer» D. Transformers | |
| 313. |
Television signals are |
| A. | frequency modulated |
| B. | amplitude modulated |
| C. | both frequency and amplitude modulated |
| D. | phase modulated |
| Answer» D. phase modulated | |
| 314. |
Audio signal cannot be transmitted because |
| A. | the signal has more noise |
| B. | the signal cannot be amplified for distance communication |
| C. | the transmitting antenna length is very small to design |
| D. | the transmitting antenna length is very large and impracticable |
| Answer» E. | |
| 315. |
Select the correct statement(s) from the following. I. In conductors, the valence and conduction bands may overlap. II. Substances with energy gap of the order of 10 eV are insulators. III. The resistivity of a semiconductor increases with increase in temperature. IV. The conductivity of a semiconductor increases with increase in temperature. |
| A. | I and II only |
| B. | I and III only |
| C. | I, II and IV |
| D. | I, II, III and IV |
| Answer» D. I, II, III and IV | |
| 316. |
Match the Column I and Column II.Column -1Column - II[A]Isotopes(1)Mass number same but different atomic number[B]Isobars(2)Atomic number same but different mass number.[C]Isotones(3)Number of neutrons plus number of protons[D]Nucleons(4)Number of neutrons same but different atomic number |
| A. | [A] \[\to \] (3); [B] \[\to \] (1); [C] \[\to \] (2); [D] \[\to \] (4) |
| B. | [A] \[\to \] (2); [B] \[\to \] (1); [C] \[\to \] (4); [D] \[\to \] (3) |
| C. | [A] \[\to \] (1); [B] \[\to \] (2); [C] \[\to \] (3); [D] \[\to \] (4) |
| D. | [A] \[\to \] (1); [B] \[\to \] (3); [C] \[\to \] (2); [D] \[\to \] (4) |
| Answer» C. [A] \[\to \] (1); [B] \[\to \] (2); [C] \[\to \] (3); [D] \[\to \] (4) | |
| 317. |
The neutron, proton, electron and alpha particle are moving with equal kinetic energies. How can the particles be arranged in the increasing order of their velocities? [NDA] |
| A. | alpha particle-neutron-proton- electron |
| B. | proton-electron-neutron-alpha particle |
| C. | electron-proton-neutron-alpha particle |
| D. | neutron-proton-electron-alpha particle |
| Answer» B. proton-electron-neutron-alpha particle | |