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.
| 201. |
Consider the following statements: A body weighs less at the equator than at the poles because: [NDA] 1. earth rotates about its axis. 2. the ice cap at the poles increases gravitational pull. 3. equatorial diameter is greater than the polar diameter. 4. of some unknown facts. Which of the statements given above is/are incorrect? |
| A. | 1 and 2 |
| B. | 3 only |
| C. | 1 and 3 |
| D. | 4 only |
| Answer» C. 1 and 3 | |
| 202. |
Assertion [A]: The weight of a body decreases with the increase of altitude on earth.Reason [R]: The earth is not a perfect sphere. [IAS Prelim] |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true hut R is false |
| D. | A is false but R is true |
| Answer» D. A is false but R is true | |
| 203. |
Match the columns I and II. Column I Column II A. Weight 1. Minimum B. \[{{g}_{equator}}\] 2. Zero C. \[{{g}_{poles}}\] 3. Vector D. \[{{g}_{centre}}\] 4. Maximum |
| A. | [A] \[\to \] (2); [B] \[\to \] [1]; [C] \[\to \] (3); [D] \[\to \] (4) |
| B. | [A] \[\to \] (2); [B] \[\to \] (2); [C] \[\to \] (4); [D] \[\to \] (3) |
| C. | [A] \[\to \] (3); [B] \[\to \] (1); [C] \[\to \] (4); [D] \[\to \] (2) |
| D. | [A] \[\to \] (4); [B] \[\to \] (3); [C] \[\to \] (1); [D] \[\to \] (2) |
| Answer» D. [A] \[\to \] (4); [B] \[\to \] (3); [C] \[\to \] (1); [D] \[\to \] (2) | |
| 204. |
The mass of a body on earth is 100 kg (acceleration due to gravity, \[{{g}_{e}}=10\,\,m/{{s}^{2}}\] .If acceleration due to gravity on the moon is \[{{g}_{e}}/6\], then the mass of the body on the moon is : [IAS Prelim] |
| A. | 100/6 kg |
| B. | 60 kg |
| C. | 100 kg |
| D. | 600kg |
| Answer» D. 600kg | |
| 205. |
A spring balance is graduated on sea level. A body of mass 1 kg is weighed at consecutively increasing heights from the earth's surface, then what would be the weight indicated by the balance? |
| A. | Weight will go on increasing continuously |
| B. | Weight will go on decreasing continuously |
| C. | Weight will remain same |
| D. | Weight will first increase and then decreases |
| Answer» C. Weight will remain same | |
| 206. |
Directions (Q.9) : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below. Assertion: The tidal waves in sea are primarily due to the gravitational effect of earth. Reason: The intensity of gravitational field of earth is maximum at the surface of earth. |
| A. | Assertion is correct, reason is correct; reason is a correct explanation for assertion. |
| B. | Assertion is correct, reason is correct; reason is not a correct explanation for assertion |
| C. | Assertion is correct, reason is incorrect |
| D. | Assertion is incorrect, reason is correct. |
| Answer» E. | |
| 207. |
Consider the following statements: [NDA] 1. The gravitational force exerted by the sun on the moon is greater than the gravitational force exerted by the earth on the moon. 2. A heavy body falls at a faster rate than a light body in vacuum. Which of the following statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» B. 2 only | |
| 208. |
A body weighs 5 kg on equator. At the poles it is likely to weight [NDA] |
| A. | 5kg |
| B. | less than 5 kg but not zero |
| C. | 0 kg |
| D. | more than 5 kg |
| Answer» E. | |
| 209. |
Two objects of different masses falling freely near the surface of moon would |
| A. | have same velocities at any instant |
| B. | have different accelerations |
| C. | experience forces of same magnitude |
| D. | undergo a change in their inertia |
| Answer» B. have different accelerations | |
| 210. |
The value of acceleration due to gravity |
| A. | is same on equator and poles |
| B. | is least on poles |
| C. | is least on equator |
| D. | increases from pole to equator |
| Answer» C. is least on equator | |
| 211. |
A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points? [NDA] |
| A. | 1 W |
| B. | 2 W |
| C. | 4 W |
| D. | 8 W |
| Answer» D. 8 W | |
| 212. |
What is the order of magnitude of electric resistance of the human body (dry)? [IAS Prelim] |
| A. | \[{{10}^{2}}\] ohm |
| B. | \[{{10}^{4}}\] ohm |
| C. | \[{{10}^{6}}\] ohm |
| D. | \[{{10}^{8}}\] ohm |
| Answer» C. \[{{10}^{6}}\] ohm | |
| 213. |
Magnetism of a bar magnet can be destroyed if it is [NDA]I. kept in the magnetic meridian.II. placed in a direction opposite to that of the Earth's horizontal intensity.III. heated to a temperature known as Curie temperature.Select the correct answer using the code given below |
| A. | I and III only |
| B. | II only |
| C. | II and III only |
| D. | I, II and III |
| Answer» D. I, II and III | |
| 214. |
Assertion [A]: A person stands at a distance of 1m in front of a concave mirror. If the radius of curvature of the mirror is 4m, the image of the person lies at a distance 2m behind the mirror.Reason [R]: The general mirror equation confirms the location of the image from the mirror and it could be a real image. [NDA] |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is NOT the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» D. A is false but R is true | |
| 215. |
Match the column -I and Column - II. Column-I Column-IIA.MyopiaP.Convex lensB.HypermetropiaQ.Concave lensC.PresbyopiaR.Cylindrical lensD.AstigmatismS.Bifocal Lens |
| A. | A-P; B-Q; C-S; D-R |
| B. | A-P; B-Q; C-R; D-S |
| C. | A-Q; B-P; C-S; D-R |
| D. | A-Q; B-P; C-R; D-S |
| Answer» D. A-Q; B-P; C-R; D-S | |
| 216. |
Assertion [A]: Convex mirror is used as a driver mirror.Reason [R]: Images formed by convex mirror are diminished in size. [NDA] |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is NOT the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 217. |
Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length [NDA] |
| A. | 4 cm |
| B. | 8 cm |
| C. | 12 cm |
| D. | 32 cm |
| Answer» B. 8 cm | |
| 218. |
If the focal length of the biconvex lens is 25 cm, then the power of the lens will be [NDA] |
| A. | + 4 dioptre |
| B. | - 4 dioptre |
| C. | + 0.04 dioptre |
| D. | - 0.04 dioptre |
| Answer» B. - 4 dioptre | |
| 219. |
Assertion [A]: A myopic person is advised to use concave lens.Reason [R]: The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina. [NDA] |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is NOT the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are individually true but R is NOT the correct explanation of A | |
| 220. |
Consider the following statements [CDS] 1. Clear sky appears blue due to poor scattering of blue wavelength of visible light. 2. Red part of light shows more scattering than blue light in the atmosphere. 3. In the absence of atmosphere, there would be no scattering of light and sky will look black. Which of the statements given above is/are correct? |
| A. | Only 1 |
| B. | 1 and 2 |
| C. | Only 3 |
| D. | All of these |
| Answer» D. All of these | |
| 221. |
An object is placed at the focus of a concave mirror. The image will be [NDA] |
| A. | real, inverted, same size at the focus |
| B. | real, upright, same size at the focus |
| C. | virtual, inverted, highly enlarged at infinity |
| D. | real, inverted, highly enlarged at infinity |
| Answer» E. | |
| 222. |
A refracting telescope consists of [NDA] |
| A. | one concave mirror and one 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 lengths |
| Answer» E. | |
| 223. |
Yellow colour light is used as fog light because yellow colour [NDA] |
| A. | light is most scattered by fog |
| B. | has the longest wavelength among all colours |
| C. | has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red |
| D. | has the shortest wavelength among all colours not already reserved for other purpose |
| Answer» D. has the shortest wavelength among all colours not already reserved for other purpose | |
| 224. |
Two pieces of conductor of same material and of equal length are connected in series with a cell. One of the two pieces has cross-sectional area double that of the other. Which one of the following statements is correct in this regard? [NDA] |
| A. | The thicker one will allow stronger current to pass through it. |
| B. | The thinner one would allow stronger current to pass through it. |
| C. | Same amount of electric current would pass through both the pieces producing more heat in the thicker one. |
| D. | Same amount of electric current would pass through both the pieces producing more heat in the thinner one. |
| Answer» E. | |
| 225. |
Refractive index of an optical medium changes with [NDA] 1. the nature of the medium. 2. the change in the angle of incidence of the ray. 3. colour of the incident ray. Select the correct answer using the code given below: |
| A. | 1 and 3 only |
| B. | 2 and 3 only |
| C. | 1 and 2 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 226. |
In the figure shown above, \[{{L}_{1}}\] and \[{{L}_{2}}\], are two lenses and are kept along the same axis. A parallel beam of light falling on \[{{L}_{1}}\] leaves \[{{L}_{2}}\] as a parallel beam: [NDA] Consider the following statements.1. Both \[{{L}_{1}}\] and \[{{L}_{2}}\] can be convex lenses.2. The distance between the two lenses can be equal to sum of their focal lengths.Which of the statements given above is/are correct? |
| A. | Only 1 |
| B. | Only 2 |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 227. |
The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for [NDA] |
| A. | a microscope |
| B. | a telescope |
| C. | both microscope and telescope) |
| D. | neither microscope nor telescope |
| Answer» C. both microscope and telescope) | |
| 228. |
An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image? [NDA] |
| A. | Virtual, not magnified |
| B. | Virtual, magnified |
| C. | Real, not magnified |
| D. | Real, magnified |
| Answer» C. Real, not magnified | |
| 229. |
A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens? [NDA] |
| A. | - 0.8 D |
| B. | - 3.0 D |
| C. | + 0. 8D |
| D. | + 3.0 D |
| Answer» E. | |
| 230. |
A ray of light is incident normally on one of the faces of right angled isosceles prism as shown above. It undergoes total internal reflection from hypotenuse. Which one of the following is the minimum refractive index of the material of the prism? [NDA] |
| A. | 1.0 |
| B. | 1.33 |
| C. | 1.414 |
| D. | 1.6 |
| Answer» D. 1.6 | |
| 231. |
What is the essential difference between a terrestrial telescope and an astronomical telescope? [NDA] |
| A. | One of the lenses in a terrestrial telescope is concave |
| B. | The final image formed in a terrestrial telescope is virtual |
| C. | A terrestrial telescope forms an erect image while an astronomical telescope forms an inverted image |
| D. | A terrestrial telescope forms an inverted image while an a astronomical telescope forms an erect image |
| Answer» D. A terrestrial telescope forms an inverted image while an a astronomical telescope forms an erect image | |
| 232. |
Which one among the following is used to make periscope? [NDA] |
| A. | Concave lens |
| B. | Concave mirror |
| C. | Plane mirror |
| D. | None of the above |
| Answer» D. None of the above | |
| 233. |
What is the phenomenon of the moon to appear bigger in size as it approaches the horizon, called? [NDA] |
| A. | Atmospheric refraction of light |
| B. | Diffraction of light |
| C. | Scattering of light |
| D. | Total internal reflection of light by water vapours |
| Answer» B. Diffraction of light | |
| 234. |
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a [NDA] |
| A. | converging lens |
| B. | diverging lens |
| C. | plano-converging lens |
| D. | plano-diverging lens |
| Answer» C. plano-converging lens | |
| 235. |
The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct? [NDA] |
| A. | 110 V is safer but more expensive to maintain |
| B. | 110 V is safer and cheaper to maintain |
| C. | 110 V leads to lower power loss |
| D. | 110 V works better at higher latitudes |
| Answer» B. 110 V is safer and cheaper to maintain | |
| 236. |
Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror? [NDA] |
| A. | \[{{180}^{o}}\] |
| B. | \[90{}^\circ \] |
| C. | \[45{}^\circ \] |
| D. | \[0{}^\circ \] |
| Answer» E. | |
| 237. |
When an optician prescribes a - 5D lens, what does it mean? [NDA] |
| A. | Concave lens of 20 cm focal length |
| B. | Convex lens of 5 cm focal length |
| C. | Concave lens of 5 cm focal length |
| D. | Convex lens of 5 cm focal length |
| Answer» B. Convex lens of 5 cm focal length | |
| 238. |
Consider the following statement: The principle of total internal reflection is applicable to explain the [NDA] 1. Formation of mirage in desert. 2. Formation of image in microscope. 3. Colour of evening sky. 4. Operation of optical fibres. Which of the statement given above are correct? |
| A. | 1 and 4 |
| B. | 3 and 4 |
| C. | 2 and 3 |
| D. | 1 and 2 |
| Answer» B. 3 and 4 | |
| 239. |
When light waves travel from air to glass, which variables are affected? [NDA] |
| A. | Wavelength, frequency and velocity |
| B. | Velocity and frequency only |
| C. | Wavelength and frequency only |
| D. | Wavelength and velocity only |
| Answer» E. | |
| 240. |
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of [NDA] |
| A. | reflection of light |
| B. | refraction of light |
| C. | total internal reflection of light |
| D. | interference of light |
| Answer» C. total internal reflection of light | |
| 241. |
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as [NDA] |
| A. | resistance R |
| B. | heat generated by the circuit |
| C. | thermal power radiated by the circuit |
| D. | rate of change of resistance |
| Answer» D. rate of change of resistance | |
| 242. |
Which one of the statements given below is not correct? [NDA] |
| A. | A vertical plane passing through the axis of a freely suspended magnet is called the magnetic meridian |
| B. | A vertical plan passing through the axis of rotation of the Earth is called the geographical meridian |
| C. | The degree to which the magnetic field can penetrate a medium is known as the relative permeability of the medium |
| D. | The relative permeability is not a dimensionless quantity |
| Answer» E. | |
| 243. |
In which one of the following cases Ohm's law is not valid? [NDA] |
| A. | Wire bound resistor |
| B. | Potentiometer |
| C. | Junction diode |
| D. | Electric bulb |
| Answer» D. Electric bulb | |
| 244. |
Consider the following statements: An ordinary light bulb has a rather short life because the: [IAS Prelim] 1. filament wire is not uniform. 2. bulb cannot be evacuated completely. 3. wires supporting the filament melt at high temperatures. Which of the above statements are correct? |
| A. | 1 and 3 |
| B. | 2 and 3 |
| C. | 1 and 2 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 245. |
The earth's magnetic field is approximately [NDA] |
| A. | 1 Tesla |
| B. | 2 Gauss |
| C. | \[{{10}^{4}}\] Tesla |
| D. | 1 Gauss |
| Answer» E. | |
| 246. |
Which one of the following is correct? Lightning is formed, when [NDA] |
| A. | similar charges of electricity rush towards each other and then get repelled |
| B. | clouds strike against impurities in air and the friction bums up these impurities |
| C. | strong opposite charges in different clouds break down the resistance offered by intervening air |
| D. | water vapour produces electricity in the clouds |
| Answer» D. water vapour produces electricity in the clouds | |
| 247. |
If the electrical resistance of a typical substance suddenly drops to zero then the substance is called [NDA] |
| A. | superconductor |
| B. | semiconductor |
| C. | conductor |
| D. | insulator |
| Answer» B. semiconductor | |
| 248. |
Graphene is frequently in news recently. What is its importance? [IAS Prelim] 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct? |
| A. | 1 and 2 only |
| B. | 3 and 4 only |
| C. | 1, 2 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» D. 1, 2, 3 and 4 | |
| 249. |
Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must [NDA] |
| A. | have different cross-sections |
| B. | have different temperatures |
| C. | be of different materials |
| D. | be of same density |
| Answer» D. be of same density | |
| 250. |
Which one among the following is the correct order of power consumption for light of equal intensity? [NDA] |
| A. | CFL tube < Fluorescent tube < Incandescent bulb < Light emitting diode |
| B. | Light emitting diode < CFL tube < Fluorescent tube < Incandescent bulb |
| C. | CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb |
| D. | Incandescent bulb < Light emitting diode < Fluorescent tube < CFL tube |
| Answer» C. CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb | |