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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2301. |
The ceilings of a concert hall are usually curved because . . . . . . . . . |
| A. | they reflect the sound to the audience |
| B. | they can absorb noise |
| C. | They get better aeration in the hall |
| D. | No other sound from outside can enter through the curved ceiling |
| Answer» C. They get better aeration in the hall | |
| 2302. |
A spherical air bubble is embedded in a piece of glass. How does that bubble behave for a ray of light passing through that bubble? |
| A. | convergent lens |
| B. | diverging lens |
| C. | plane converging lens |
| D. | plane diverging lens |
| Answer» C. plane converging lens | |
| 2303. |
When a ray of light travels from one medium to another, its . . . . . . . . . . . . |
| A. | wavelength remains the same |
| B. | frequency remains the same |
| C. | the frequency increases |
| D. | the wavelength increases |
| Answer» C. the frequency increases | |
| 2304. |
he stars appear to be higher in the sky than they actually are. Who can explain this? |
| A. | Atmospheric refraction |
| B. | deflection of light |
| C. | complete internal change |
| D. | diffraction of light |
| Answer» B. deflection of light | |
| 2305. |
How is white light produced in the tube? |
| A. | by heating a copper wire |
| B. | By heating the fiber |
| C. | by stimulating the atom |
| D. | oscillating molecules |
| Answer» C. by stimulating the atom | |
| 2306. |
The human eye is like a camera, so it has a lens system, what makes an eye lens? |
| A. | erect or vertical, true image of a body on the retina |
| B. | inverted, virtual image of a body on the retina |
| C. | inverted, real image of the body on the retina |
| D. | erect or vertical, true image of a body on the iris |
| Answer» D. erect or vertical, true image of a body on the iris | |
| 2307. |
Yellow color is used in fog lights because . . . . . . . . |
| A. | Most of the yellow color is scattered by fog |
| B. | Yellow has the longest wavelength of all colors |
| C. | Of all the colours, except red and orange, yellow has the longest wavelength, but red is already used as a brake light and stop light, while orange is avoided because of its similarity to red. is done |
| D. | Of all the colors yellow has the shortest wavelength, which has not yet been saved for any other purpose. |
| Answer» D. Of all the colors yellow has the shortest wavelength, which has not yet been saved for any other purpose. | |
| 2308. |
Which one is used in making periscope? |
| A. | convex lens |
| B. | concave lens |
| C. | plane mirror |
| D. | none of these |
| Answer» D. none of these | |
| 2309. |
What happens in a refracting telescope? |
| A. | a concave mirror and a convex lens |
| B. | two convex lenses of equal focal length |
| C. | two concave mirrors of different focal lengths |
| D. | two convex lenses of unequal focal length |
| Answer» E. | |
| 2310. |
What is a mirror used as a front lamp of a car? |
| A. | spherical concave |
| B. | Flat |
| C. | Cylindrical |
| D. | parabolic concave |
| Answer» E. | |
| 2311. |
obtained from sunlight? |
| A. | Vitamin A |
| B. | Vitamin B |
| C. | vitamin D |
| D. | vitamin C |
| Answer» D. vitamin C | |
| 2312. |
When red, blue and light beams fall at the same place, what is the color of the light? |
| A. | purple |
| B. | Red |
| C. | Yellow |
| D. | White |
| Answer» E. | |
| 2313. |
Which of the following is used to know the structure of crystal? |
| A. | gamma rays |
| B. | X-rays |
| C. | UV rays |
| D. | visible light |
| Answer» E. | |
| 2314. |
At sunrise and sunset, the Sun appears to be red-orange in colour, because . . . . . . . . |
| A. | At that time the sun emits only red-orange light |
| B. | All other colors are absorbed by the atmosphere |
| C. | Raktabha - Orange light is least scattered by the atmosphere |
| D. | Hematoma - except for the orange color, all other colors are reflected back by the atmosphere |
| Answer» D. Hematoma - except for the orange color, all other colors are reflected back by the atmosphere | |
| 2315. |
What is the reason for the formation of a beautiful rainbow in the sky? |
| A. | Sunlight scattering from the water point only |
| B. | Reflection of sunlight only from the water point |
| C. | Reflection and refraction of sunlight only through the dot of water |
| D. | Refraction, scattering and reflection of sunlight from a water point |
| Answer» E. | |
| 2316. |
In every plant the process of photosynthesis takes place? |
| A. | take up nitrogen and release oxygen |
| B. | taking in carbon dioxide and releasing oxygen |
| C. | take in oxygen and release carbon dioxide |
| D. | take in oxygen and release nitrogen |
| Answer» C. take in oxygen and release carbon dioxide | |
| 2317. |
The temperature of the bird. . . . . . . . |
| A. | 390 to 400 centigrade |
| B. | 400 to 420 centigrade |
| C. | 370 to 380 centigrade |
| D. | 380 to 390 centigrade |
| Answer» C. 370 to 380 centigrade | |
| 2318. |
Is foliage helpful? |
| A. | in respiration |
| B. | in photosynthesis |
| C. | in emissions |
| D. | in both A and B |
| Answer» C. in emissions | |
| 2319. |
The biological process in which O₂ is liberated? |
| A. | Photosynthesis |
| B. | respiration and excretion |
| C. | breathing only |
| D. | digestion |
| Answer» B. respiration and excretion | |
| 2320. |
Why do we see the Sun only a few minutes before the actual sunrise? |
| A. | light scattering |
| B. | Full internal reflection of light |
| C. | diffraction of light |
| D. | Refraction of light |
| Answer» E. | |
| 2321. |
What is the temperature of the filament of a burning electric bulb? |
| A. | 100℃ to 500℃ |
| B. | 1000℃ to 1500℃ |
| C. | 2000℃ to 2500℃ |
| D. | 3000℃ to 500℃ |
| Answer» D. 3000℃ to 500℃ | |
| 2322. |
What confirms the transverse of light waves? |
| A. | Reflection |
| B. | interference |
| C. | diffraction |
| D. | धुव्रण ( polarization ) |
| Answer» E. | |
| 2323. |
What is the temperature of the Sun's surface? |
| A. | 5800 Kelvin |
| B. | 4800 Kelvin |
| C. | 6800 Kelvin |
| D. | 3800 Kelvin |
| Answer» D. 3800 Kelvin | |
| 2324. |
Oxygen released in photosynthesis is produced? |
| A. | by photolysis of water |
| B. | from carbon dioxide |
| C. | from phosphoglyceric acid |
| D. | from chloroplast |
| Answer» B. from carbon dioxide | |
| 2325. |
Is mirage an example? |
| A. | of light reflection |
| B. | deflection of light |
| C. | of light refraction |
| D. | of light scattering |
| Answer» D. of light scattering | |
| 2326. |
What is an example of dispersion of light? |
| A. | Mirage |
| B. | diamond shine |
| C. | spectrum obtained from prism |
| D. | Optical fiber |
| Answer» D. Optical fiber | |
| 2327. |
of resonance waves. . . . . . . . arise because of? |
| A. | refraction |
| B. | abuse |
| C. | reflection |
| D. | diffraction |
| Answer» D. diffraction | |
| 2328. |
Which of the following statements is true for light waves? |
| A. | Red has the longest wavelength |
| B. | Violet has the longest wavelength |
| C. | Violet color has more velocity than red color |
| D. | The frequency of red color is higher than the frequency of purple color |
| Answer» B. Violet has the longest wavelength | |
| 2329. |
How long does the effect of sound last in the human ear? |
| A. | 1/20 second |
| B. | 1/10 second |
| C. | 1/3 second |
| D. | 1/5 second |
| Answer» C. 1/3 second | |
| 2330. |
What should be the minimum distance between the source of sound and the reflecting surface so that the echo can be heard clearly? |
| A. | 10 meters |
| B. | 17 meters |
| C. | 24 meters |
| D. | 30 meters |
| Answer» C. 24 meters | |
| 2331. |
On which principle of sound does the stethoscope work? |
| A. | reflection |
| B. | refraction |
| C. | diffraction |
| D. | Polarization |
| Answer» B. refraction | |
| 2332. |
What is the frequency of sound waves in the audio range |
| A. | 20 Hz to 20 , 000 Hz |
| B. | 0 . 5 Hz to 5 Hz |
| C. | 1 Hz to 10 Hz |
| D. | 20 , 000 Hz to 40 , 000 Hz |
| Answer» B. 0 . 5 Hz to 5 Hz | |
| 2333. |
What is the intensity of sound in ordinary conversation? |
| A. | 20 - 30 decibels |
| B. | 30 - 40 decibels |
| C. | 50 - 60 decibels |
| D. | 90 - 100 decibels |
| Answer» C. 50 - 60 decibels | |
| 2334. |
We listen to the programs of different stations by turning the knob of the radio, is it possible? |
| A. | due to resonance |
| B. | because of the crash |
| C. | due to interference |
| D. | due to diffraction |
| Answer» B. because of the crash | |
| 2335. |
Sound waves cannot travel? |
| A. | in water |
| B. | in the air |
| C. | in iron |
| D. | in a vacuum |
| Answer» E. | |
| 2336. |
The frequency of ultrasonic waves. . . . . . |
| A. | over 20000 Hz |
| B. | exceeds 200000 Hz |
| C. | less than 20000 Hz |
| D. | is 2000 Hz |
| Answer» B. exceeds 200000 Hz | |
| 2337. |
What is used to clean the interiors of aircraft? |
| A. | ultrasonic wave |
| B. | oxalic acid |
| C. | infrared wave |
| D. | Carbon dioxide |
| Answer» B. oxalic acid | |
| 2338. |
What should be the minimum distance between the reflecting plane and the sound source to hear a clear echo? |
| A. | 20 meters |
| B. | 30 meters |
| C. | 40 meters |
| D. | 17 meters |
| Answer» E. | |
| 2339. |
Who produced the ultrasonic waves by whistling the most? |
| A. | Newton |
| B. | by galton |
| C. | Hertz |
| D. | Faraday |
| Answer» C. Hertz | |
| 2340. |
The speed of sound in mercury is approximately? |
| A. | 1450 m. / From . |
| B. | 332 m. / From . |
| C. | 330 m / From . |
| D. | All of the above |
| Answer» B. 332 m. / From . | |
| 2341. |
The working of radar is based on the following principle? |
| A. | refraction of radio waves |
| B. | reflection of radio waves |
| C. | doppler effect |
| D. | Raman Effect |
| Answer» C. doppler effect | |
| 2342. |
The relationship between follow time and the volume of the hall is presented |
| A. | by doppler |
| B. | Newton |
| C. | Sabine |
| D. | by Laplace |
| Answer» D. by Laplace | |
| 2343. |
The propagation of sound waves in vacuum. . . . . . . . . |
| A. | intensifies |
| B. | Does not happen |
| C. | slow at first and then intensify |
| D. | first fast and then slow |
| Answer» C. slow at first and then intensify | |
| 2344. |
Mach numbers are used in relation to velocity? |
| A. | of sound |
| B. | of the ship |
| C. | of aircraft |
| D. | of spacecraft |
| Answer» D. of spacecraft | |
| 2345. |
What is the lowest value of the speed of sound? |
| A. | in solid |
| B. | in liquid |
| C. | in gas |
| D. | in mercury |
| Answer» D. in mercury | |
| 2346. |
What is used to drive away insects and harmful elements from homes? |
| A. | ultrasonic wave |
| B. | Radio wave |
| C. | infrared wave |
| D. | subsonic wave |
| Answer» B. Radio wave | |
| 2347. |
Which process and sound do not occur in both? |
| A. | diffraction |
| B. | reflection |
| C. | Polarization |
| D. | refraction |
| Answer» D. refraction | |
| 2348. |
Which of the following phenomena is not represented by waves? |
| A. | reflection |
| B. | refraction |
| C. | Polarization |
| D. | diffraction |
| Answer» E. | |
| 2349. |
The thunder of the clouds is heard long after the lightning of the clouds. this is due to ? |
| A. | clouds block sound waves |
| B. | thunder comes later |
| C. | Light can travel in vacuum but sound cannot |
| D. | The speed of light is much greater than the speed of sound |
| Answer» E. | |
| 2350. |
Ultrasonic waves by humans. . . . . . . . . |
| A. | can be heard |
| B. | can't be heard |
| C. | can be heard sometimes |
| D. | none of these |
| Answer» C. can be heard sometimes | |