MCQOPTIONS
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MCQOPTIONS
This section includes 197 Mcqs, each offering curated multiple-choice questions to sharpen your NEET-UG knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen? |
| A. | Fe |
| B. | Cl |
| C. | Carbon |
| D. | Oxygen |
| Answer» C. Carbon | |
| 152. |
Niche is |
| A. | the range of temperature that the organism needs to live |
| B. | the physical space where an organism lives |
| C. | all the biological factors in the organisms environment |
| D. | the functional role played by the organism where it lives |
| Answer» E. | |
| 153. |
World Ozone Day is celebrated on |
| A. | 16th September |
| B. | 21st April |
| C. | 5th June |
| D. | 22nd April |
| Answer» B. 21st April | |
| 154. |
Natality refers to |
| A. | Number of individuals leaving the habitat |
| B. | Birth rate |
| C. | Death rate |
| D. | Number of individuals entering a habitat |
| Answer» C. Death rate | |
| 155. |
Which of the following has proved helpful in preserving pollen as fossils? |
| A. | Oil content |
| B. | Cellulosic intine |
| C. | Pollenkitt |
| D. | Sporopollenin |
| Answer» E. | |
| 156. |
Offsets are produced by |
| A. | Parthenocarpy |
| B. | Mitotic divisions |
| C. | Meiotic divisions |
| D. | Parthenogenesis |
| Answer» C. Meiotic divisions | |
| 157. |
Which of the following flowers only once in its life-time? |
| A. | Mango |
| B. | Jackfruit |
| C. | Bamboo species |
| D. | Papaya |
| Answer» D. Papaya | |
| 158. |
The experimental proof for semiconservative replication of DNA was first shown in a |
| A. | Plant |
| B. | Bacterium |
| C. | Fungus |
| D. | Virus |
| Answer» C. Fungus | |
| 159. |
Select the correct statement |
| A. | Spliceosomes take part in translation |
| B. | Punnett square was developed by a British scientist |
| C. | Franklin Stahl coined the term ‘‘linkage’’ |
| D. | Transduction was discovered by S. Altman |
| Answer» C. Franklin Stahl coined the term ‘‘linkage’’ | |
| 160. |
A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to |
| A. | Lerma Rojo |
| B. | Sharbati Sonora |
| C. | Co-667 |
| D. | Basmati |
| Answer» E. | |
| 161. |
The correct order of steps in Polymerase Chain Reaction (PCR) is |
| A. | Denaturation, Extension, Annealing |
| B. | Annealing, Extension, Denaturation |
| C. | Extension, Denaturation, Annealing |
| D. | Denaturation, Annealing, Extension |
| Answer» E. | |
| 162. |
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is |
| A. | Research Committee on Genetic Manipulation (RCGM) |
| B. | Council for Scientific and Industrial Research (CSIR) |
| C. | Indian Council of Medical Research (ICMR) |
| D. | Genetic Engineering Appraisal Committee (GEAC) |
| Answer» E. | |
| 163. |
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called |
| A. | Biodegradation |
| B. | Biopiracy |
| C. | Bio-infringement |
| D. | Bioexploitation |
| Answer» C. Bio-infringement | |
| 164. |
In which of the following forms is iron absorbed by plants? |
| A. | Free element |
| B. | Ferrous |
| C. | Ferric |
| D. | Both ferric and ferrous |
| Answer» D. Both ferric and ferrous | |
| 165. |
Which of the following elements is responsible for maintaining turgor in cells? |
| A. | Potassium |
| B. | Sodium |
| C. | Magnesium |
| D. | Calcium |
| Answer» B. Sodium | |
| 166. |
Pollen grains can be stored for several years in liquid nitrogen having a temperature of |
| A. | –196°C |
| B. | –80°C |
| C. | –120°C |
| D. | –160°C |
| Answer» B. –80°C | |
| 167. |
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other? |
| A. | Banana |
| B. | Yucca |
| C. | Hydrilla |
| D. | Viola |
| Answer» C. Hydrilla | |
| 168. |
Double fertilization is |
| A. | Fusion of two male gametes with one egg |
| B. | Fusion of one male gamete with two polar nuclei |
| C. | Fusion of two male gametes of a pollen tube with two different eggs |
| D. | Syngamy and triple fusion |
| Answer» E. | |
| 169. |
Oxygen is not produced during photosynthesis by |
| A. | Cycas |
| B. | Nostoc |
| C. | Green sulphur bacteria |
| D. | Chara |
| Answer» D. Chara | |
| 170. |
The correction factor ‘a’ to the ideal gas equation corresponds to |
| A. | Electric field present between the gas molecules |
| B. | Volume of the gas molecules |
| C. | Density of the gas molecules |
| D. | Forces of attraction between the gas molecules |
| Answer» E. | |
| 171. |
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction |
| A. | Is tripled |
| B. | Is doubled |
| C. | Is halved |
| D. | Remains unchanged |
| Answer» C. Is halved | |
| 172. |
On which of the following properties does the coagulating power of an ion depend? |
| A. | Both magnitude and sign of the charge on the ion |
| B. | Size of the ion alone |
| C. | The magnitude of the charge on the ion alone |
| D. | The sign of charge on the ion alone |
| Answer» B. Size of the ion alone | |
| 173. |
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their |
| A. | More extensive association of carboxylic acid via van der Waals force of attraction |
| B. | Formation of carboxylate ion |
| C. | Formation of intramolecular H-bonding |
| D. | Formation of intermolecular H-bonding |
| Answer» E. | |
| 174. |
Which of the following oxides is most acidic in nature? |
| A. | BaO |
| B. | BeO |
| C. | MgO |
| D. | CaO |
| Answer» C. MgO | |
| 175. |
Nitration of aniline in strong acidic medium also gives m-nitroaniline because |
| A. | In absence of substituents nitro group always goes to m-position |
| B. | In electrophilic substitution reactions amino group is meta directive. |
| C. | Inspite of substituents nitro group always goes to only m-position |
| D. | In acidic (strong) medium aniline is present as anilinium ion. |
| Answer» E. | |
| 176. |
Regarding cross-linked or network polymers, which of the following statements is incorrect? |
| A. | Examples are bakelite and melamine |
| B. | They are formed from bi- and tri-functional monomers. |
| C. | They contain covalent bonds between various linear polymer chains. |
| D. | They contain strong covalents bonds in their polymer chains. |
| Answer» E. | |
| 177. |
Which of the following compounds can form a zwitterion? |
| A. | Benzoic acid |
| B. | Acetanilide |
| C. | Aniline |
| D. | Glycine |
| Answer» E. | |
| 178. |
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct? |
| A. | Time period of a simple pendulum on the Earth would decrease |
| B. | Walking on the ground would become more difficult |
| C. | Raindrops will fall faster |
| D. | ‘g’ on the Earth will not change |
| Answer» E. | |
| 179. |
A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere? |
| A. | Rotational kinetic energy |
| B. | Moment of inertia |
| C. | Angular velocity |
| D. | Angular momentum |
| Answer» E. | |
| 180. |
A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of –0.004 cm, the correct diameter of the ball is |
| A. | 0.053 cm |
| B. | 0.525 cm |
| C. | 0.521 cm |
| D. | 0.529 cm |
| Answer» E. | |
| 181. |
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E . Due to the force q E , its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively |
| A. | 1 m/s, 3.5 m/s |
| B. | 1 m/s, 3 m/s |
| C. | 2 m/s, 4 m/s |
| D. | 1.5 m/s, 3 m/s |
| Answer» C. 2 m/s, 4 m/s | |
| 182. |
Which one of the following statements is incorrect? |
| A. | Frictional force opposes the relative motion. |
| B. | Limiting value of static friction is directly proportional to normal reaction. |
| C. | Rolling friction is smaller than sliding friction. |
| D. | Coefficient of sliding friction has dimensions of length. |
| Answer» E. | |
| 183. |
A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be |
| A. | 0.8 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 0.4 |
| Answer» C. 0.5 | |
| 184. |
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from |
| A. | The lattice structure of the material of the rod |
| B. | The magnetic field |
| C. | The current source |
| D. | The induced electric field due to the changing magnetic field |
| Answer» D. The induced electric field due to the changing magnetic field | |
| 185. |
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27ºC two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27ºC is |
| A. | 350 m/s |
| B. | 339 m/s |
| C. | 330 m/s |
| D. | 300 m/s |
| Answer» C. 330 m/s | |
| 186. |
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is |
| A. | 10 times greater |
| B. | 5 times greater |
| C. | Smaller |
| D. | Equal |
| Answer» D. Equal | |
| 187. |
The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance |
| A. | 1.389 H |
| B. | 138.88 H |
| C. | 0.138 H |
| D. | 13.89 H |
| Answer» E. | |
| 188. |
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be |
| A. | 30 cm towards the mirror |
| B. | 36 cm away from the mirror |
| C. | 30 cm away from the mirror |
| D. | 36 cm towards the mirror |
| Answer» C. 30 cm away from the mirror | |
| 189. |
In a p-n junction diode, change in temperature due to heating |
| A. | Does not affect resistance of p-n junction |
| B. | Affects only forward resistance |
| C. | Affects only reverse resistance |
| D. | Affects the overall V - I characteristics of p-n junction |
| Answer» E. | |
| 190. |
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is |
| A. | 30 |
| B. | 10 |
| C. | 20 |
| D. | 15 |
| Answer» D. 15 | |
| 191. |
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is |
| A. | 2 : –1 |
| B. | 1 : –1 |
| C. | 1 : 1 |
| D. | 1 : –2 |
| Answer» C. 1 : 1 | |
| 192. |
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of |
| A. | Large focal length and large diameter |
| B. | Large focal length and small diameter |
| C. | Small focal length and large diameter |
| D. | Small focal length and small diameter |
| Answer» B. Large focal length and small diameter | |
| 193. |
In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same and D) the separation between the slits needs to be changed to |
| A. | 2.1 mm |
| B. | 1.9 mm |
| C. | 1.8 mm |
| D. | 1.7 mm |
| Answer» C. 1.8 mm | |
| 194. |
A set of 'n' equal resistors, of value 'R' each, are connected in series to a battery of emf 'E' and internal resistance 'R'. The current drawn is I. Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of 'n' is |
| A. | 20 |
| B. | 11 |
| C. | 10 |
| D. | 9 |
| Answer» D. 9 | |
| 195. |
A carbon resistor of (47 ± 4.7) k is to be marked with rings of different colours for its identification. The colour code sequence will be |
| A. | Yellow – Green – Violet – Gold |
| B. | Yellow – Violet – Orange – Silver |
| C. | Violet – Yellow – Orange – Silver |
| D. | Green – Orange – Violet – Gold |
| Answer» C. Violet – Yellow – Orange – Silver | |
| 196. |
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is |
| A. | 6.25% |
| B. | 20% |
| C. | 26.8% |
| D. | 12.5% |
| Answer» D. 12.5% | |
| 197. |
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is |
| A. | 12.5 cm |
| B. | 8 cm |
| C. | 13.2 cm |
| D. | 16 cm |
| Answer» D. 16 cm | |