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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.
| 251. |
Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel [NDA] |
| A. | paramagnetic substances |
| B. | ferromagnetic substances |
| C. | diamagnetic substances |
| D. | non-magnetic substances |
| Answer» D. non-magnetic substances | |
| 252. |
What is the number of neutral points for a bar magnet with its north pole pointing geographical north? [NDA] |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Infinite |
| Answer» D. Infinite | |
| 253. |
From a power station, the power is transmitted at a very high voltage because - |
| A. | it is generated only at high voltage |
| B. | it is cheaper to produce electricity at high voltage |
| C. | electricity at high voltage is less dangerous |
| D. | there is less loss of energy in transmission at high voltage |
| Answer» C. electricity at high voltage is less dangerous | |
| 254. |
Consider the following statements regarding a motor car battery: [IAS Prelim] 1. The voltage is usually 12V. 2. Electrolyte used is hydrochloric acid. 3. Electrodes are lead and copper. 4. Capacity is expressed in ampere-hour. Which of the above statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 255. |
The polarity of an unmarked horse shoe magnet can be determined by using [NDA] |
| A. | a charged glass rod |
| B. | a magnetic compass |
| C. | an electroscope |
| D. | another unmarked bar magnet |
| Answer» C. an electroscope | |
| 256. |
Fluorescent tubes are fitted with a choke. The choke coil: [IAS Prelim] |
| A. | steps up the line voltage |
| B. | steps-down the line voltage |
| C. | reduces current in the circuit |
| D. | chokes low frequency current |
| Answer» D. chokes low frequency current | |
| 257. |
Two masses m and 9 m are moving with equal kinetic energies. The ratio of the magnitudes of their momenta is |
| A. | 0.0423611111111111 |
| B. | 1 : 3 |
| C. | 0.125694444444444 |
| D. | 1 : 9 |
| Answer» C. 0.125694444444444 | |
| 258. |
If a light body and a heavy body have equal momentum, then [NDA] |
| A. | the lighter body has greater energy than the heavier body |
| B. | the lighter body has lesser kinetic energy than the heavier body |
| C. | the kinetic energy of the lighter body is equal to the kinetic energy of the heavier body |
| D. | the kinetic energy of both the bodies are independent of momentum. |
| Answer» D. the kinetic energy of both the bodies are independent of momentum. | |
| 259. |
A particle oscillates in one dimension about the equilibrium position subject to a force \[{{F}_{xx}}(x)\] that has an associated potential energy U(x). If k is the force constant, which one of the following relations is true? [NDA] |
| A. | \[{{F}_{x}}(x)=k{{x}^{2}}\] |
| B. | \[{{F}_{x}}(x)=kx\] |
| C. | \[U(x)=\frac{1}{2}kx\] |
| D. | \[U(x)=\frac{1}{2}{{k}^{2}}x\] |
| Answer» C. \[U(x)=\frac{1}{2}kx\] | |
| 260. |
Practical unit of heat is |
| A. | Calorie |
| B. | Horse power |
| C. | Joule |
| D. | Watt |
| Answer» B. Horse power | |
| 261. |
A swinging pendulum has its maximum acceleration at [NDA] |
| A. | the bottom of the swing |
| B. | the two extremities of the swing |
| C. | every point on the swing |
| D. | no particular portion of the pendulum |
| Answer» C. every point on the swing | |
| 262. |
A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is [NDA] |
| A. | zero |
| B. | towards the centre of circle |
| C. | away from the centre along the radius of the circle |
| D. | perpendicular to the radius and along the velocity |
| Answer» C. away from the centre along the radius of the circle | |
| 263. |
A body is projected vertically upwards with a velocity of 96 ft/s. What is the total time for which the body will remain in the air? |
| A. | 3 s |
| B. | 6 s |
| C. | 9 s |
| D. | 12 s |
| Answer» C. 9 s | |
| 264. |
A stone is thrown vertically upwards with an initial velocity u from the top of a tower of height \[\frac{12{{u}^{2}}}{g}\]. With what velocity does the stone reach the ground? [NDA] |
| A. | u |
| B. | 4u |
| C. | 5u |
| D. | \[2\sqrt{6}u\] |
| Answer» D. \[2\sqrt{6}u\] | |
| 265. |
A passenger in a moving train tosses a five rupee coin. If the coin falls behind him, then the train must be moving with a uniform |
| A. | acceleration |
| B. | deceleration |
| C. | speed |
| D. | velocity |
| Answer» B. deceleration | |
| 266. |
Match List I (Items) with List II (Unit of length) and select the correct answer by using the codes given below the lists.List I (Items)List II (Units of length)A.Distance between earth and stars1MicronsB.Interatomic distances in a solid2AngstromsC.Size of the nucleus3Light yearsD.Wavelength of infrared laser4Fermi5kilometres |
| A. | A-5, B-4, C-2, D-1 |
| B. | A-3, B-2, C-4, D-1 |
| C. | A-5, B-2, C-4, D-3 |
| D. | A-3, B-4, C-1, D-2 |
| Answer» E. | |
| 267. |
Which one of the following pairs does not have the same dimension? [NDA] |
| A. | Potential energy and kinetic energy |
| B. | Density and specific gravity |
| C. | Focal length and height |
| D. | Gravitational force and frictional force |
| Answer» C. Focal length and height | |
| 268. |
Match List I (Physical quantity) with list II (Units) and select the correct answer by using the codes given below the lists.List I (Physical quantity)List II (Units)A.Solid angle1.PascalB.Impulse2.SteradianC.Vicosity3.Newton-secondD.Pressure4.Pascal-second |
| A. | A-2, B-4, C-3, D-1 |
| B. | A-2, B-3, C-4, D-1 |
| C. | A-1, B-4, C-3, D-2 |
| D. | A-1, B-3, C-4, D-2 |
| Answer» C. A-1, B-4, C-3, D-2 | |
| 269. |
Match List 'I' (Physical quantity) with list II (Dimension) and select the correct answer by using the codes given below the lists.List I (Physical quantity)List II (Dimension)A. Density1. [\[ML{{T}^{-2}}\]]B. Force2. [\[M{{L}^{-3}}\]]C. Energy3. [\[ML{{T}^{-1}}\]]D. Momentum4. [\[M{{L}^{2}}{{T}^{-2}}\]] |
| A. | A-3, B-2, C-4, D-1 |
| B. | A-1, B-2, C-3, D-4 |
| C. | A-2, B-1, C-4, D-3 |
| D. | A-3, B-2, C-1, D-4 |
| Answer» D. A-3, B-2, C-1, D-4 | |
| 270. |
Which one of the following is not a dimension less quantity? |
| A. | Strain |
| B. | Relative density |
| C. | Frequency |
| D. | Angle |
| Answer» D. Angle | |
| 271. |
What is the correct sequence in which the lengths of the following units increase? 1. Angstrom 2. Micron 3. Nanometer Select the correct answer using the code given below: [NDA] |
| A. | 1, 2, 3 |
| B. | 3, 1, 2 |
| C. | 1, 3, 2 |
| D. | 2, 3, 1 |
| Answer» D. 2, 3, 1 | |
| 272. |
Match List I (Physical quantity) with List II (Units) and select the correct answer using the codes given below the lists.List I (Physical quantity) (Units)List II (Physical quantity)A. Power1. kg \[m{{s}^{-1}}\]B. Energy2. kg \[{{m}^{2}}{{s}^{-1}}\]C. Momentum3. \[N{{m}^{-2}}\]D. Pressure4. kW5. kWh |
| A. | A-4, B-5, C-1, D-3 |
| B. | A-4, B-5, C-1, D-2 |
| C. | A-5, B-4, C-1, D-2 |
| D. | A-5, B-4, C-2, D-3 |
| Answer» B. A-4, B-5, C-1, D-2 | |
| 273. |
Assertion: Number of significant figures in 0.005 is one and that in 0.500 is three. Reason: This is because zeros are not significant. |
| A. | If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. |
| B. | If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. |
| C. | If Assertion is correct but Reason is incorrect. |
| D. | If Assertion is incorrect but Reason is correct. |
| Answer» D. If Assertion is incorrect but Reason is correct. | |
| 274. |
Match List I (Units) with List II (Physical quantity) and select the correct answer using the codes given below the lists. [CDS]List I (Units)List II Physical quantity)[A]Watt1.Electric charge[B]Tesla2.Power[C]Coulomb3.Luminous intensity[D]Candela4Magnetic field |
| A. | A-1, B-4, C-1, D-3 |
| B. | A-1, B-2, C-3, D-4 |
| C. | A-1, B-2, C-4, D-3 |
| D. | A-2, B-4, C-3, D-1 |
| Answer» B. A-1, B-2, C-3, D-4 | |
| 275. |
Which of the following statements is/ are false about mode of heat transfer? I. In radiation, heat is transferred from one medium to another without affecting the intervening medium II. Radiation and convection are possible in vacuum while conduction requires material medium. III. Conduction is possible in solids while convection occurs in liquids and gases. |
| A. | I only |
| B. | II only |
| C. | II and III |
| D. | I, II and III |
| Answer» C. II and III | |
| 276. |
Thermal conductivity of aluminium, copper and stainless steel increases in the order |
| A. | Copper < Aluminium < Stainless Steel |
| B. | Stainless Steel < Aluminium < Copper |
| C. | Aluminium < Copper < Stainless Steel |
| D. | Copper < Stainless Steel < Aluminium |
| Answer» C. Aluminium < Copper < Stainless Steel | |
| 277. |
When water is heated from \[0{}^\circ C\] to \[20{}^\circ C\], how does its volume change? |
| A. | It shall increase |
| B. | It shall decrease |
| C. | It shall first increase and then decrease |
| D. | It shall first decrease and then increase |
| Answer» E. | |
| 278. |
Which of the following properties are most desirable for a cooking pot? [NDA] |
| A. | High specific heat capacity and low conductivity |
| B. | Low specific heat capacity and high conductivity |
| C. | High specific heat capacity and high conductivity |
| D. | Low specific heat capacity and low conductivity |
| Answer» C. High specific heat capacity and high conductivity | |
| 279. |
The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason? [IAS Prelim] |
| A. | Ice is a bad conductor of heat. |
| B. | Since the surface of the lake is at the same temperature as the air, no heat is lost. |
| C. | The density of water is maximum at \[4{}^\circ C\]. |
| D. | None of the statements [a], [b] and [c] given is correct. |
| Answer» B. Since the surface of the lake is at the same temperature as the air, no heat is lost. | |
| 280. |
If the door of a running refrigerator in a closed room is kept open, what will be the net effect on the room? [CDS] |
| A. | It will cool the room |
| B. | It will heat the room |
| C. | It will make no difference on the average |
| D. | It will make the temperature go up and down |
| Answer» C. It will make no difference on the average | |
| 281. |
Assertion [A]: Steam is more harmful for human body than the boiling water in case of bum.Reason [R]: Boiling water contains more heat than steam. [CDS] |
| 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 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 | |
| 282. |
Which one among the following denotes the smallest temperature? [NDA] |
| A. | \[1{}^\circ \] on the Celsius scale |
| B. | \[1{}^\circ \] on the Kelvin scale |
| C. | \[1{}^\circ \] on the Fahrenheit scale |
| D. | \[1{}^\circ \] on the Reaumur scale |
| Answer» C. \[1{}^\circ \] on the Fahrenheit scale | |
| 283. |
Which zone of a candle flame is the hottest? [NDA] |
| A. | Dark innermost zone |
| B. | Outermost zone |
| C. | Middle luminous zone |
| D. | Central zone |
| Answer» C. Middle luminous zone | |
| 284. |
Which one among the following statements is not correct? [NDA] |
| A. | In progressive waves, the amplitude may be constant and neighbouring points are out of phase with each other |
| B. | In air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode |
| C. | Transverse wave can be polarised while longitudinal wave cannot be polarised |
| D. | Longitudinal wave can be polarised while transverse wave cannot be polarised |
| Answer» B. In air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode | |
| 285. |
The Visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belongs? [NDA] |
| A. | X-ray |
| B. | Gamma ray |
| C. | Infrared |
| D. | Ultraviolet |
| Answer» B. Gamma ray | |
| 286. |
A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100 Hz. Which of the following is the type of propagating wave and its speed? [NDA] |
| A. | Longitudinal, 50 m/s |
| B. | Transverse, 50 m/s |
| C. | Longitudinal, 100 m/s |
| D. | Transverse, 100 m/s |
| Answer» E. | |
| 287. |
The sound travels fastest in |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | none of these |
| Answer» B. liquids | |
| 288. |
An oscilloscope is an instrument which allows us to see waves produced by [CDS] |
| A. | Visible light |
| B. | X-rays |
| C. | Sound |
| D. | Gamma rays |
| Answer» D. Gamma rays | |
| 289. |
In SONAR, we use [CDS] |
| A. | ultrasonic waves |
| B. | infrasonic waves |
| C. | radio waves |
| D. | audible sound waves |
| Answer» B. infrasonic waves | |
| 290. |
Figure given above shows the part of a long string in which transverse waves are produced. Which pair of points is in phase? [NDA] |
| A. | A and E |
| B. | B and J |
| C. | D and J |
| D. | C and G |
| Answer» E. | |
| 291. |
Which one of the following types of waves are used in a night vision apparatus? [IAS Prelim] |
| A. | Radio waves |
| B. | Microwaves |
| C. | Infra-red waves |
| D. | None of the above |
| Answer» D. None of the above | |
| 292. |
Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel, the motion of the particle is |
| A. | simple harmonic |
| B. | parabolic |
| C. | oscillatory |
| D. | non-periodic |
| Answer» D. non-periodic | |
| 293. |
If the moon is to escape from the gravitational field of the earth forever, it will require a velocity [SSC CGL] |
| A. | 11.2 km/s |
| B. | less than |
| C. | slightly more than 111.2 km/s |
| D. | 22.4 km/s |
| Answer» B. less than | |
| 294. |
An astronaut in the orbit in a spacecraft feels weightlessness |
| A. | due to the absence of gravity inside |
| B. | due to the face that space craft has no energy |
| C. | because acceleration in the orbit is equal to acceleration of gravity outside |
| D. | their is no gravity outside |
| Answer» D. their is no gravity outside | |
| 295. |
The substance which exhibits practically no elastic effect is |
| A. | rubber |
| B. | quartz |
| C. | Fe |
| D. | Cu |
| Answer» C. Fe | |
| 296. |
Assertion: The value of 'g' is greater at the equator than at the poles. Reason: Radius is more at the equator than at the poles. |
| A. | If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. |
| B. | If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. |
| C. | If Assertion is correct but Reason is incorrect. |
| D. | If Assertion is incorrect but Reason is correct. |
| Answer» E. | |
| 297. |
Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong? |
| A. | It is a freely falling body. |
| B. | It is moving with constant speed |
| C. | It is acted upon by a force directed away from the centre of the earth which counter-balances the gravitational pull. |
| D. | It is an accelerated motion |
| Answer» D. It is an accelerated motion | |
| 298. |
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. | |
| 299. |
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 | |
| 300. |
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 | |