MCQOPTIONS
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MCQOPTIONS
This section includes 245 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
If the rays of light are incident from a medium of refractive index 'n1', to another of refractive index 'n2', then the relation between object 'u' and image 'v' distance in terms of radius of curvature 'R' of the curved spherical surface is __________. |
| A. | n2/v - n1/u = (n2 + n1)/R |
| B. | n2/v - n1/u = (n2 - n1)/R |
| C. | n2/v + n1/u = (n2 - n1)/R |
| D. | n2/u - n1/v = (n2 - n1)/R |
| Answer» C. n2/v + n1/u = (n2 - n1)/R | |
| 152. |
Concave mirrors are used in headlights of vehicles, because they |
| A. | Focus light from the bulb onto nearby vehicle |
| B. | Send parallel rays |
| C. | Fit well into the shape of the headlight |
| D. | Are cheaper than other mirrors |
| Answer» C. Fit well into the shape of the headlight | |
| 153. |
An observer looks at a tree of height 15 m. with a telescope of magnifying power 10. To him the tree appears |
| A. | 15 times taller |
| B. | 10 times nearer |
| C. | 15 times nearer |
| D. | 10 times taller |
| Answer» C. 15 times nearer | |
| 154. |
Lenses are widely used in spectacle to |
| A. | Protect eyes from sore eye |
| B. | Prevention against conjunctivitis |
| C. | Help in the formation of the image |
| D. | Correct the eye defects |
| Answer» E. | |
| 155. |
In Young's Experiment to produce interference pattern using light of wavelength 'λ', the width of the fringe observed on the screen placed 'D' distance from the two slits which are placed 'd' units apart is equal to ____________. |
| A. | dλ/D |
| B. | d/Dλ |
| C. | Dλ/d |
| D. | D/dλ |
| Answer» D. D/dλ | |
| 156. |
A beam of monochromatic light is passing from one medium into another. Which one of the following quantities does not change? |
| A. | Wavelength |
| B. | Frequency |
| C. | Velocity |
| D. | Amplitude |
| Answer» C. Velocity | |
| 157. |
A ray of light meets a plane mirror at an angle of incidence 15°. What will be the deviation of the ray after reflection? |
| A. | 150° |
| B. | 120° |
| C. | 30° |
| D. | 60° |
| Answer» B. 120° | |
| 158. |
Lambert's law is related to |
| A. | reflection |
| B. | illumination |
| C. | interference |
| D. | refraction |
| Answer» C. interference | |
| 159. |
In a double-slit experiment, green light (5303 Å) falls on a double slit having a separation of 19.44 µ-m and a width 4.05 µ-m. The number of bright fringes between the first and the second diffraction minima is |
| A. | 5 |
| B. | 10 |
| C. | 9 |
| D. | 4 |
| Answer» B. 10 | |
| 160. |
If a real image is obtained at 10 cm from a curved mirror by keeping an object at 15 cm from the mirror, then find it's radius of curvature and name the type of mirror? |
| A. | R = 6 c m and the mirror is concave |
| B. | R = 12 cm and the mirror is concave |
| C. | R = 12 cm and the mirror is convex |
| D. | R = 6 cm and the mirror is convex |
| Answer» C. R = 12 cm and the mirror is convex | |
| 161. |
Newton's rings can be obtained in: |
| A. | both transmitted and reflected light systems |
| B. | transmitted light system only |
| C. | any light system with narrow source of light |
| D. | reflected light system only |
| Answer» B. transmitted light system only | |
| 162. |
Light is incident normally on a completely absorbing surface with an energy flux of 25 Wcm-2. If the surface has an area of 25 cm2, the momentum transferred to the surface in 40 min time duration will be: |
| A. | 6.3 × 10-4 Ns |
| B. | 1.4 × 10-6 Ns |
| C. | 5.0 × 10-3 Ns |
| D. | 3.5 × 10-6 Ns |
| Answer» D. 3.5 × 10-6 Ns | |
| 163. |
A convex lens of focal length 30 cm and a concave lens of focal length 10 cm are separated by certain distance. A parallel beam of light is incident on the convex lens and the light emerging out of the combination is also parallel beam.Find the distance between the two lenses. |
| A. | 20 cm |
| B. | 15 cm |
| C. | 40 cm |
| D. | 10 cm |
| Answer» B. 15 cm | |
| 164. |
A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is: |
| A. | 0.24 m |
| B. | 1.60 m |
| C. | 0.32 m |
| D. | 0.16 m |
| Answer» D. 0.16 m | |
| 165. |
A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it. Find the location of the image. |
| A. | 50 cm from the mirror on the side of the object |
| B. | 60 cm from the mirror on the side of the object |
| C. | 30 cm from the mirror on the side of the object |
| D. | 40 cm from the mirror on the side of the object |
| Answer» C. 30 cm from the mirror on the side of the object | |
| 166. |
Find the focal length (in cm) and name the lens if on keeping an object at 24 cm in front of it, an inverted image is obtained 12 cm behind it? |
| A. | f = 16 and the lens is convex |
| B. | f = 8 and the lens is concave |
| C. | f = 16 and the lens is concave |
| D. | f = 8 and the lens is convex |
| Answer» E. | |
| 167. |
In a Young’s double slit experiment, the ratio of the slit’s width is 4 : 1. The ratio of the intensity of maxima to minima, close to the central fringe on the screen, will be: |
| A. | 25 : 9 |
| B. | 9 : 1 |
| C. | 4 : 1 |
| D. | \({\left( {\sqrt 3 + 1} \right)^4}:16\) |
| Answer» C. 4 : 1 | |
| 168. |
If 'u' is object distance, 'v' is image distance and 'f' is focal length, then the mirror equation is __________. |
| A. | 1 / v - 1 / u = 1 / f |
| B. | 1 / v + 1 / u = -1 / f |
| C. | 1 / v + 1 / u = 1 / f |
| D. | 1 / u - 1 / v = 1 / f |
| Answer» D. 1 / u - 1 / v = 1 / f | |
| 169. |
A rainbow is produced due to which one of the following phenomenon? |
| A. | Dispersion of light |
| B. | Interference of light |
| C. | Diffraction of light |
| D. | Scattering of light by atmospheric dust |
| Answer» B. Interference of light | |
| 170. |
Interference fringes are observed with a biprism of refracting angle 1° and refractive index 1.5 on a screen 100 cm away form it. The wavelength of light used is 5890 Å. If the distance between the source and the biprism is 20 cm, the fringe width is: |
| A. | 0.680 mm |
| B. | 0.101 mm |
| C. | 0.508 mm |
| D. | 0.202 mm |
| Answer» E. | |
| 171. |
Brilliance of diamond is due to |
| A. | interference of light |
| B. | diffraction of light |
| C. | polarization of light |
| D. | total internal reflection of light |
| Answer» E. | |
| 172. |
During dispersion of white light, the ______ light bends the most |
| A. | blue |
| B. | violet |
| C. | green |
| D. | red |
| Answer» C. green | |
| 173. |
Name the scientist who first used a glass prism to obtain the spectrum of sunlight |
| A. | C. V. Raman |
| B. | Lord Rayleigh |
| C. | Issac Newton |
| D. | S. Chandrasekhar |
| Answer» D. S. Chandrasekhar | |
| 174. |
A pencil is placed upright at a distance of 10 cm from a convex lens of focal length 15 cm. The nature of the image of the pencil will be |
| A. | Real, inverted and magnified |
| B. | Real, erect and magnified |
| C. | Virtual, erect and reduced |
| D. | Virtual, erect and magnified |
| Answer» E. | |
| 175. |
A glass prism splits white light into different colours. This phenomenon is called dispersion of light by prism. Which one of the following statements is correct? |
| A. | Red light will deviate the most and it is because of the reflection of light |
| B. | Violet light will deviate the most and it is because of the refraction of light |
| C. | Red light will deviate the most and it is because of the refraction of light |
| D. | Violet light will deviate the most and it is because of the reflection of light |
| Answer» C. Red light will deviate the most and it is because of the refraction of light | |
| 176. |
If an object is placed at a distance of 30 cm from a convex lens of focal length 20 cm, then the nature and magnification of the image will be |
| A. | erect and two times magnified |
| B. | inverted and four times magnified |
| C. | erect and four times magnified |
| D. | inverted and two times magnified |
| Answer» E. | |
| 177. |
If the object is beyond the centre of curvature, then the image obtained after reflection from a concave mirror is? |
| A. | beyond the centre of curvature, enlarged, real and inverted |
| B. | between focus and centre of curvature, enlarged, real and inverted |
| C. | beyond the centre of curvature, diminished, real and inverted |
| D. | between focus and centre of curvature, diminished, real and inverted |
| Answer» E. | |
| 178. |
A near sighted person cannot clearly see beyond 200 cm. Find the power of the lens needed to see objects at large distances. |
| A. | + 0.5 D |
| B. | – 0.5 D |
| C. | + 1.5 D |
| D. | – 1.5 D |
| Answer» C. + 1.5 D | |
| 179. |
An object is placed 10 cm in front of a convex lens of focal length 15 cm. The image produced will be |
| A. | Real and magnified |
| B. | Virtual and magnified |
| C. | Virtual and reduced in size |
| D. | Real and reduced in size |
| Answer» C. Virtual and reduced in size | |
| 180. |
In a Young's double slit experiment, waves of wavelength λ, are incident on the two slits in phase. They travel to a point on the screen to produce a second minimum of the interference pattern. The difference in the distance travelled by the waves is: |
| A. | 3 λ/2 |
| B. | 2λ |
| C. | λ |
| D. | λ/2 |
| Answer» B. 2λ | |
| 181. |
A thin prism \(P_1\) of angle 4° and refractive index 1.54 is combined with another thin prism \(P_2\) of refractive index 1.72 to produce dispersion without deviation. The angle of \(P_2\) is |
| A. | 3° |
| B. | 2.6° |
| C. | 4° |
| D. | 5.33° |
| Answer» B. 2.6° | |
| 182. |
Consider a tank made of glass (refractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index μ. A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of μ is: |
| A. | \(\sqrt {\frac{5}{3}} \) |
| B. | \(\frac{3}{{\sqrt 5 }}\) |
| C. | \(\frac{5}{{\sqrt 3 }}\) |
| D. | \(\frac{4}{3}\) |
| Answer» C. \(\frac{5}{{\sqrt 3 }}\) | |
| 183. |
If an object is placed at infinity from a concave lens of focal length 15 cm, then the distance of virtual image from the lens will be: |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | at infinity |
| Answer» C. 20 cm | |
| 184. |
A bird in the air is at a height ‘y’ from the surface of the water, A fish is at a depth ‘x’ below the surface of the water. The apparent distance of fish from the bird is: (The refractive index of water is) |
| A. | \(x + \frac{y}{\mu }\) |
| B. | μx + y |
| C. | \(\frac{x}{\mu } - y\) |
| D. | \(\frac{x}{\mu } + y\) |
| Answer» E. | |
| 185. |
Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star. |
| A. | 305 × 10-9 radian |
| B. | 610 × 10-9 radian |
| C. | 152.5 × 10-9 radian |
| D. | 457.5 × 10-9 radian |
| Answer» B. 610 × 10-9 radian | |
| 186. |
A ray of light that strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: |
| A. | 30° |
| B. | 45° |
| C. | 60° |
| D. | 90° |
| Answer» D. 90° | |
| 187. |
Newton's rings, observed in an optical interference experimental set-up, are loci of points of: |
| A. | unequal thickness and equal inclination |
| B. | equal thickness only |
| C. | both equal inclination and equal thickness |
| D. | equal inclination only |
| Answer» C. both equal inclination and equal thickness | |
| 188. |
In Fresnel's Biprism, the value of wavelength (λ) depends upon |
| A. | The distance between two coherent sources |
| B. | The fringe-width |
| C. | The distance between slit and eyepiece of telescope |
| D. | All of the above |
| Answer» E. | |
| 189. |
If the power of a lens is - 4.0 D, then it means that the lens is a __________. |
| A. | concave lens of focal length -50 m |
| B. | convex lens of focal length +50 cm |
| C. | concave lens of focal length -25 cm |
| D. | convex lens of focal length -25 m |
| Answer» D. convex lens of focal length -25 m | |
| 190. |
______ was the first to use a glass prism to obtain the spectrum of sunlight |
| A. | C.V. Raman |
| B. | John Dalton |
| C. | Henry Cavendish |
| D. | Issac Newton |
| Answer» E. | |
| 191. |
__________ principle says that each point of the wavefront is the source of a secondary disturbance and the wavelets emanating from these points spread out in all directions with the speed of the wave. |
| A. | Rayleigh |
| B. | Huygens |
| C. | Maxwell |
| D. | Hertz |
| Answer» C. Maxwell | |
| 192. |
A converging lens forms a real image I of an object on its principle axis. A rectangular glass slab of refractive index μ and thickness x is introduced between I and lens. Image I will move: |
| A. | Away from the lens by (μ – 1) x |
| B. | Away from the lens by \(\left( {1 - \frac{1}{\mu }} \right)x\) |
| C. | Towards the lens by \(\left( {1 - \frac{1}{\mu }} \right)x\) |
| D. | Towards the lens by (μ – 1) x |
| Answer» C. Towards the lens by \(\left( {1 - \frac{1}{\mu }} \right)x\) | |
| 193. |
In a Newton’s rings experiment, light of wavelength λ and a lens of radius of curvature R are used. The difference in diameters of 25th and 16th dark rings is: |
| A. | \(4\sqrt {\lambda R}\) |
| B. | \(3\sqrt {\lambda R}\) |
| C. | \(2\sqrt {\lambda R}\) |
| D. | \(\sqrt {\lambda R}\) |
| Answer» D. \(\sqrt {\lambda R}\) | |
| 194. |
A curved mirror has a radius of curvature 28 cm. What will be the focal length of mirror? |
| A. | 2 cm |
| B. | 14 cm |
| C. | 28 cm |
| D. | 40 cm |
| Answer» C. 28 cm | |
| 195. |
If v = image distance, u = object distance then linear magnification, m = |
| A. | \(m = \frac{v}{u}\) |
| B. | \(m = -\frac{v^2}{u}\) |
| C. | \(m = -\frac{v}{u}\) |
| D. | m = \(m = -\frac{v}{u^2}\) |
| Answer» D. m = \(m = -\frac{v}{u^2}\) | |
| 196. |
If a liquid drop is introduced between the plano-convex lens and the glass plate in a Newton's rings experimental setup, then the interference fringe pattern will: |
| A. | expand |
| B. | change from circular fringes into straight line fringes |
| C. | shrink |
| D. | remain the same |
| Answer» D. remain the same | |
| 197. |
In the diffraction pattern obtained in a single slit experiment the width of the central bright maximum is _____________ as the width of the other maxima. |
| A. | four times |
| B. | half |
| C. | one fourth |
| D. | twice |
| Answer» E. | |
| 198. |
Light seems to turn around corners and enter regions where we would expect a shadow. These effects, known as _____________. |
| A. | interference |
| B. | diffraction |
| C. | polarisation |
| D. | refraction |
| Answer» C. polarisation | |
| 199. |
In which a convex mirror is used?A. Rear View mirrors in vehiclesB. Glass windowsC. Makeup MirrorD. Kaleidoscope |
| A. | A |
| B. | C |
| C. | B |
| D. | D |
| Answer» B. C | |
| 200. |
A ray through the centre of curvature incident on a concave mirror after reflection _______________. |
| A. | passes through the focus |
| B. | becomes parallel to the principal axis |
| C. | deviates in such a way that when projected backwards passes through the focus |
| D. | retraces the path it came from |
| Answer» E. | |