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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.
| 2251. |
What are the primary colors? |
| A. | red, green and blue |
| B. | blue, yellow and green |
| C. | red, brown and yellow |
| D. | yellow, purple and blue |
| Answer» B. blue, yellow and green | |
| 2252. |
When a ray of light passes from a rarer medium to a denser medium, it . . . . . . . . . . . . . |
| A. | goes in a straight line |
| B. | leans towards the normal |
| C. | moves away from the normal |
| D. | none of these |
| Answer» C. moves away from the normal | |
| 2253. |
Due to which quality - Dharma, a stick immersed in a vessel filled with water appears to be bent? |
| A. | reflection |
| B. | scatter |
| C. | refraction |
| D. | buoyancy |
| Answer» D. buoyancy | |
| 2254. |
For what reason does the person present inside the water seem to be at a relatively higher height than its actual position above the surface of the water? |
| A. | due to refraction of light |
| B. | due to reflection of light |
| C. | due to interference of light |
| D. | due to diffraction of light |
| Answer» B. due to reflection of light | |
| 2255. |
The reason behind the extraordinary brilliance of a properly cut diamond is that . . . . . . |
| A. | it has very high transparency |
| B. | it has a very high index of refraction |
| C. | he is very tough |
| D. | it has a definite cleavage plane |
| Answer» C. he is very tough | |
| 2256. |
The reason for the formation of a rainbow? |
| A. | reflection of the sun's rays in the atmosphere by water droplets |
| B. | reflection of the sun's rays in the atmosphere by dust particles |
| C. | light scattering |
| D. | pole of light |
| Answer» B. reflection of the sun's rays in the atmosphere by dust particles | |
| 2257. |
Which one of the following types of glass can break ultraviolet rays? |
| A. | soda glass |
| B. | pyrex glass |
| C. | Jena Glass |
| D. | crooks glass |
| Answer» E. | |
| 2258. |
Why does a coin lying in a vessel full of water appear to be slightly raised? |
| A. | due to reflection of light |
| B. | due to refraction of light |
| C. | due to diffraction of light |
| D. | due to dispersion of light |
| Answer» C. due to diffraction of light | |
| 2259. |
The color of the sky appears to be blue because . . . . . |
| A. | Blue color is more in sunlight than other colors |
| B. | Light of shorter wavelength is scattered more by the atmosphere than light of longer wavelength |
| C. | Atmosphere absorbs longer waves than shorter waves |
| D. | the eye is more sensitive to blue |
| Answer» C. Atmosphere absorbs longer waves than shorter waves | |
| 2260. |
The sun appears to be elliptical before it sets. |
| A. | at that time the sun changes its shape |
| B. | light gets scattered |
| C. | effect of refraction of light |
| D. | effect of diffraction of light |
| Answer» D. effect of diffraction of light | |
| 2261. |
Which of the following lenses is used to correct near-sightedness? |
| A. | उन्नतोदर ( Convex ) |
| B. | Concave |
| C. | Cylindrical |
| D. | none of these |
| Answer» C. Cylindrical | |
| 2262. |
Up to what frequency can a bat hear ultrasonic waves? |
| A. | up to 100 frequency |
| B. | up to 1 frequency |
| C. | up to 1000 frequency |
| D. | up to 100000 frequency |
| Answer» E. | |
| 2263. |
What is used in the glasses of a person suffering from near-sightedness? |
| A. | convex lens |
| B. | Flat - Convex lens |
| C. | Concave lens |
| D. | Plane - Concave lens |
| Answer» D. Plane - Concave lens | |
| 2264. |
How should a person using spectacles use a microscope? |
| A. | they cannot use a microscope |
| B. | they should be wearing glasses |
| C. | they should take off their glasses |
| D. | It doesn't matter whether he takes off his glasses or wears them |
| Answer» C. they should take off their glasses | |
| 2265. |
Which one of the following theories confirms the wave nature of light? |
| A. | Newton's particle theory |
| B. | principle of interference |
| C. | The electromagnetic wave theory of light |
| D. | none of the above |
| Answer» D. none of the above | |
| 2266. |
What is the meaning of Hypermetropial? |
| A. | myopia |
| B. | far-sightedness |
| C. | far-sighted |
| D. | presbyopia |
| Answer» C. far-sighted | |
| 2267. |
The phenomenon of light hitting a smooth surface and returning is called? |
| A. | Refraction of light |
| B. | reflection of light |
| C. | refractor of light |
| D. | light scattering |
| Answer» C. refractor of light | |
| 2268. |
The color of the ocean appears blue because of the light falling on it. . . . . . . . . |
| A. | gets reflected |
| B. | gets refracted |
| C. | gets absorbed |
| D. | gets scattered |
| Answer» E. | |
| 2269. |
The sea appears blue? |
| A. | because of the greater depth |
| B. | Due to the reflection of the sky and the scattering of light by the water particles |
| C. | because of the blue color of the water |
| D. | due to the surface of the water |
| Answer» C. because of the blue color of the water | |
| 2270. |
The sky appears blue because . . . . . . . . . . |
| A. | blue gases go up |
| B. | air pollution is present |
| C. | stars emit blue light |
| D. | The air particles in the atmosphere radiate the sun's rays |
| Answer» E. | |
| 2271. |
Which part of the donor's eye is transplanted in eye donation? |
| A. | cornea |
| B. | Lens |
| C. | retina |
| D. | full eye |
| Answer» B. Lens | |
| 2272. |
When an object is placed between two parallel plane mirrors, the number of images formed will be |
| A. | Two |
| B. | One |
| C. | Six |
| D. | eternal |
| Answer» E. | |
| 2273. |
What is Endoscope? |
| A. | It is an optical instrument used to see inside the alimentary canal. |
| B. | It is a device placed on the patient's chest to regulate irregular heartbeat |
| C. | It is an instrument used to test the development of the ear. |
| D. | It is a device for recording electrical signals generated by human muscles. |
| Answer» B. It is a device placed on the patient's chest to regulate irregular heartbeat | |
| 2274. |
Cause of nausea? |
| A. | reflection by heated ground |
| B. | Complete internal reflection by layers of air |
| C. | interference of light |
| D. | diffraction of light |
| Answer» C. interference of light | |
| 2275. |
What is the reason for the sea water being blue? |
| A. | Refraction of blue light by impurities in seawater |
| B. | reflection of blue sky by sea water |
| C. | absorption of colors other than blue by water molecules |
| D. | scattering of blue light by water molecules |
| Answer» E. | |
| 2276. |
A converging lens is one which . . . . . . . . . . . . . . . |
| A. | spreads rays |
| B. | collects rays |
| C. | an imaginary image is formed |
| D. | creates a real image |
| Answer» C. an imaginary image is formed | |
| 2277. |
For what reason does a fish lying under water appear to be raised above its actual depth? |
| A. | due to diffraction of light |
| B. | due to refraction of light |
| C. | due to polarization of light |
| D. | due to reflection of light |
| Answer» C. due to polarization of light | |
| 2278. |
What is the reason for the phenomenon like mirage in the desert? |
| A. | Refraction of light |
| B. | dispersion of light |
| C. | light scattering |
| D. | Full internal reflection of light |
| Answer» E. | |
| 2279. |
The color of light is determined by? |
| A. | By velocity |
| B. | by dimension |
| C. | by wavelength |
| D. | by frequency |
| Answer» D. by frequency | |
| 2280. |
How does an air bubble behave inside water? |
| A. | Like a bifocal lens |
| B. | converging lens |
| C. | Like a divergent lens |
| D. | Like a conical lens |
| Answer» D. Like a conical lens | |
| 2281. |
Will the bubble of air in the water work as it does? |
| A. | Convex mirror |
| B. | convex lens |
| C. | concave mirror |
| D. | Concave lens |
| Answer» E. | |
| 2282. |
Which mirror is used for rear view in a motor car? |
| A. | plane mirror |
| B. | Flat - convex mirror |
| C. | concave mirror |
| D. | Convex mirror |
| Answer» E. | |
| 2283. |
Why does dry sand appear shiny, while wet sand is bright? |
| A. | it's an optical illusion |
| B. | the reason for this is reflection |
| C. | the reason for this is refraction |
| D. | The reason for this is scattering |
| Answer» C. the reason for this is refraction | |
| 2284. |
A man cannot clearly see an object more than 10 meters away. What defect of vision is he suffering from? |
| A. | hyper metropia |
| B. | hydrophobia |
| C. | Myopia |
| D. | Cataract |
| Answer» D. Cataract | |
| 2285. |
The sun appears red while rising and setting because . . |
| A. | Red color is scattered the most. |
| B. | Red color has the least scattering. |
| C. | There is no scattering of red color. |
| D. | The temperature of the sun is high during rising and setting. |
| Answer» C. There is no scattering of red color. | |
| 2286. |
There are seven colors in light. What is the way to separate the colours? |
| A. | Colors can be separated in a prism |
| B. | Colors can be separated by filter |
| C. | Colors can be differentiated from plants |
| D. | Colors cannot be separated |
| Answer» B. Colors can be separated by filter | |
| 2287. |
Some transport vehicles have additional yellow lights. This is done because . . . . . . . |
| A. | The vehicle looks beautiful when the light is yellow |
| B. | yellow light consumes less electrical energy |
| C. | Yellow light pierces the fog so that the road is clearly visible. That's why the yellow light comes in handy on foggy nights. |
| D. | Yellow light does not cause glare in the eyes of people walking on the road |
| Answer» D. Yellow light does not cause glare in the eyes of people walking on the road | |
| 2288. |
When a convex lens is immersed in water, its power is . . . . . . |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | none of these |
| Answer» B. increases | |
| 2289. |
The division of different colors of light in a prism (PRISM) is called? |
| A. | reflection of light |
| B. | Refraction of light |
| C. | diffraction of light |
| D. | dispersion of light |
| Answer» E. | |
| 2290. |
When sunlight passes through a prism, which of the following colors is refracted the most? |
| A. | Blue |
| B. | Red |
| C. | Orange |
| D. | Green |
| Answer» B. Red | |
| 2291. |
The Sun is giving energy at the rate of about 4*10²⁶ joules per second. At what rate is its mass decreasing due to the release of so much energy from the Sun? |
| A. | 4*10⁷ kg s⁻¹ |
| B. | 4*10⁹ kg s⁻¹ |
| C. | 4*10¹¹ kg s⁻¹ |
| D. | 4*10¹³ kg s⁻¹ |
| Answer» C. 4*10¹¹ kg s⁻¹ | |
| 2292. |
What should be the angle between the mirrors to obtain three images of an object with the help of plane mirrors? |
| A. | 0 degree |
| B. | 60 degree |
| C. | 90 degrees |
| D. | 45 degree |
| Answer» D. 45 degree | |
| 2293. |
Which part of the eye controls the amount of light entering the eye? |
| A. | retina |
| B. | cornea |
| C. | iris |
| D. | I ball |
| Answer» D. I ball | |
| 2294. |
Rainbow. . . . . . . . . . . . . . . . Due to this ? |
| A. | reflection |
| B. | refraction |
| C. | scatter |
| D. | reflection and refraction |
| Answer» E. | |
| 2295. |
The speed of light in water, glass and diamond is in the following order? |
| A. | diamond - glass - water |
| B. | water glass diamond |
| C. | glass - diamond - water |
| D. | diamond - water - glass |
| Answer» C. glass - diamond - water | |
| 2296. |
Which of the following color combinations is most convenient during day and night? |
| A. | orange and blue |
| B. | white and black |
| C. | yellow and blue |
| D. | Red and green |
| Answer» E. | |
| 2297. |
Two planes are placed at an angle of 90 degrees and a candle is lit between them. How many images of the candle will be formed in the mirror? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | eternal |
| Answer» C. 4 | |
| 2298. |
A solar eclipse occurs when . . . . . . . . |
| A. | the moon is between the earth and the sun |
| B. | earth is in the middle |
| C. | the sun is in the middle |
| D. | Sun, Moon and Earth are in one line and Jupiter is not in that line |
| Answer» B. earth is in the middle | |
| 2299. |
Bats can get information about their prey even from a distance by emitting what at night? |
| A. | infrared |
| B. | ultraviolet light |
| C. | chemicals from your body |
| D. | ultrasonic sound |
| Answer» E. | |
| 2300. |
The formation of bright colors in thin soap is the result of which phenomenon? |
| A. | multiple reflections and interferences |
| B. | Multiple refraction and dispersion |
| C. | refraction and dispersion |
| D. | polarization and interference |
| Answer» B. Multiple refraction and dispersion | |