MCQOPTIONS
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MCQOPTIONS
This section includes 563 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge (GK) knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
Laser is a device to produce - |
| A. | a beam of white light |
| B. | coherent light |
| C. | microwaves |
| D. | X-rays |
| Answer» C. microwaves | |
| 552. |
A black body can absorb radiations of |
| A. | lower wavelengths only |
| B. | intermediate wavelengths only |
| C. | higher wavelengths only |
| D. | all wavelengths |
| Answer» E. | |
| 553. |
A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding? |
| A. | 4 metres |
| B. | 3 metres |
| C. | 2 metres |
| D. | 1 metre |
| Answer» D. 1 metre | |
| 554. |
Ail oil drop spreads over water because |
| A. | oil is lighter than water |
| B. | oil is more viscous |
| C. | oil does not mix with water |
| D. | surface tension of oil is much smaller than that of water |
| Answer» E. | |
| 555. |
The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because - |
| A. | the ringing is not loud enough |
| B. | the glass of the bell jar absorbs the sound waves |
| C. | the bell jar is too small |
| D. | there is no air or any other gas in the bell jar |
| Answer» E. | |
| 556. |
What do radioactive substances emit? |
| A. | Radio waves |
| B. | Infrared waves |
| C. | Ultraviolet waves |
| D. | , and rays |
| Answer» E. | |
| 557. |
When hot liquid is poured into a thick glass tumbler, it cracks because glass |
| A. | is a bad conductor of heat so only inner surface expands |
| B. | has high temperature coefficient of expansion |
| C. | has a very low specific heat |
| D. | has low temperature coefficient of expansion |
| Answer» B. has high temperature coefficient of expansion | |
| 558. |
On a rainy day, small oil films on water show brilliant colors. This is due to - |
| A. | dispersion |
| B. | interference |
| C. | diffraction |
| D. | polarization |
| Answer» C. diffraction | |
| 559. |
Which layer of the earth s atmosphere reflects back the radio waves to the earth s surface? |
| A. | Ionosphere |
| B. | Stratosphere |
| C. | Mesosphere |
| D. | Exosphere |
| Answer» B. Stratosphere | |
| 560. |
Sound waves can be transmitted by any |
| A. | Medium |
| B. | Vacuum |
| C. | Both medium and vacuum |
| D. | None of the above |
| Answer» B. Vacuum | |
| 561. |
What are audible sound waves? |
| A. | Having frequency less than 20 Hz |
| B. | Having frequency between 20 Hz to 20000 Hz |
| C. | Having frequency more than 20000 Hz |
| D. | None of above |
| Answer» C. Having frequency more than 20000 Hz | |
| 562. |
Sound waves are produced by - |
| A. | Linear motion |
| B. | Circular motion |
| C. | Vibrating bodies |
| D. | Transitional motion |
| Answer» D. Transitional motion | |
| 563. |
Sensation of sound persists in our brain for about - |
| A. | 0.001s |
| B. | 0.2s |
| C. | 0.1s |
| D. | 10s |
| Answer» D. 10s | |