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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Goitre is caused due to deficiency of ________. |
| A. | Vitamin A |
| B. | lodine |
| C. | Vitamin C |
| D. | Fluorine |
| E. | None of these |
| Answer» C. Vitamin C | |
| 152. |
Vibrations, whose amplitudes of oscillations decrease with time are called |
| A. | free vibrations |
| B. | forced vibrations |
| C. | damped vibrations |
| D. | none of these |
| Answer» D. none of these | |
| 153. |
Bohr's model explains |
| A. | the spectrum of hydrogen atom only |
| B. | the spectrum of any atom or ion having on electron only |
| C. | the spectrum of hydrogen molecule |
| D. | the solar spectrum |
| Answer» C. the spectrum of hydrogen molecule | |
| 154. |
There are two walls A and B which are 180 m apart from each other. A boy standing at 60 m away from wall A claps his hands once. If the speed of sound in air is \[330\text{ }m\text{ }{{s}^{-1}}\], what is the time interval between the first and the second echo that he hears? |
| A. | 0.36 s |
| B. | 0.24 s |
| C. | 0.4 s |
| D. | 1 s |
| Answer» B. 0.24 s | |
| 155. |
The diagram shows the positions of the air particles due to propagation of sound, represented by straight lines, at a particular instant from P to Q. Which of the following statements correctly depicts the pressure variation with respect to distance? |
| A. | The lines which are closed to one another represent rarefaction which is a low pressure region. |
| B. | The lines which are far apart from one another represent compression which is a low pressure region. |
| C. | The lines which are far apart from one another represent rarefaction which is high pressure region. |
| D. | The lines which are closed to one another represent compression which is a high pressure region. |
| Answer» E. | |
| 156. |
The valency of silicon is : |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| E. | None of these |
| Answer» C. 6 | |
| 157. |
Few preventions of a disease are given below. Find out the name of the disease based on the given preventions. (i) Disposable needles and syringes should be used. (ii) Shaving blades or razors should not be shared. (iii) Blood should be screened before transfusion. |
| A. | Influenza |
| B. | AIDS |
| C. | Cholera |
| D. | Fractured bone |
| E. | None of these |
| Answer» C. Cholera | |
| 158. |
A sound wave is travelling from East to West. In which direction do the molecules in the air move? |
| A. | East to West |
| B. | West to East |
| C. | North to South |
| D. | South to North |
| Answer» B. West to East | |
| 159. |
The potential energy of a freely falling object decreases continuously. What happens to the loss of potential energy? |
| A. | It is continuously converted into sound energy |
| B. | It is continuously converted into kinetic energy |
| C. | It is continuously converted into magnetic energy |
| D. | none of these |
| Answer» C. It is continuously converted into magnetic energy | |
| 160. |
An open knife edge of mass M is dropped from a height h on a wooden floor. If the blade penetrates S into the wood, the average resistance offered by the wood to the blade is |
| A. | \[Mg\] |
| B. | \[Mg\left( 1+\frac{h}{S} \right)\] |
| C. | \[Mg(1+hS)\] |
| D. | \[mg{{\left( 1+\frac{h}{S} \right)}^{2}}\] |
| E. | None of these |
| Answer» F. | |
| 161. |
A lift is moving downwards with an acceleration equal to the acceleration due to gravity. A body of mass M kept on the floor of the lift is pulled horizontally. If the coefficient of friction is \[\mu \], then the friction resistance offered by the body is |
| A. | \[Mg\] |
| B. | \[\mu Mg\] |
| C. | \[2\mu Mg\] |
| D. | zero |
| Answer» E. | |
| 162. |
The given figure shows four similar sound waves entering four different media of equal thickness, t. The sound wave will emerge first from medium |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» D. IV | |
| 163. |
The intensity of sound is measured in the units of |
| A. | joule |
| B. | watts |
| C. | decibel |
| D. | none of these |
| Answer» D. none of these | |
| 164. |
A sound wave has a frequency of 5 kHz and wavelength 10 cm. How long will it take to travel 2.5 km? |
| A. | 5 s |
| B. | 4 s |
| C. | 3 s |
| D. | 2 s |
| E. | None of these |
| Answer» B. 4 s | |
| 165. |
Which of the following is the hearing range for human beings? |
| A. | 20 Hz to 200 Hz |
| B. | 2 Hz to 200 Hz |
| C. | 20 Hz to 20 kHz |
| D. | 20 kHz to 200 kHz |
| E. | None of these |
| Answer» C. 20 Hz to 20 kHz | |
| 166. |
Match column I with column II and select the correct option from the given codes. Column I Column II (a) Food storage (i) Phloem (b) Food conduction (ii) Xylem (c) Mechanical strength (iii) Parenchyma (d) Water conduction (iv) Scierenchyma |
| A. | a - (iii), b - (i), c - (iv), d - (ii) |
| B. | a - (ii), b - (iii), c - (iv), d - (i) |
| C. | a - (ii), b - (i), c - (iii), d - (iv) |
| D. | a - (ii), b - (i), c - (iv), d - (iii) |
| Answer» B. a - (ii), b - (iii), c - (iv), d - (i) | |
| 167. |
Which of the following statements given below is correct? Statements 1: The pressure in a liquid is the same at all points at the same horizontal level. Statement 2: As we go deeper in a liquid, the pressure increases. |
| A. | Statement 1 and 2 both are correct |
| B. | Statement 1 is correct and 2 is incorrect |
| C. | Statement 1 is incorrect and 2 is correct |
| D. | Statement 1 and 2 both are incorrect |
| E. | None of these |
| Answer» B. Statement 1 is correct and 2 is incorrect | |
| 168. |
A particle of mass m moves in a circular orbit of radius r under in action of an attractive force \[\frac{-{{K}^{2}}}{{{r}^{2}}}\] which always acts towards the centre r of the orbit. What is the total energy in the particle? |
| A. | \[\frac{k}{{{r}^{2}}}\] |
| B. | \[\frac{2k}{r}\] |
| C. | \[\frac{{{k}^{2}}}{r}\] |
| D. | \[\frac{k}{2r}\] |
| Answer» E. | |
| 169. |
Which of the following tissues is present in kidneys? |
| A. | Squamous epithelium |
| B. | Cuboidal epithelium |
| C. | Columnar epithelium |
| D. | Compound epithelium |
| Answer» C. Columnar epithelium | |
| 170. |
The frequency of sound waves can be expressed in |
| A. | Hz |
| B. | cycles/second |
| C. | \[{{\text{s}}^{-\text{1}}}\] |
| D. | all of these |
| Answer» E. | |
| 171. |
How many protons, neutrons and electrons are contained in one atom of\[_{19}^{39}K\]? |
| A. | \[19\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons |
| B. | \[19\] protons \[+\,\,20\] neutrons \[+\,\,20\] electrons |
| C. | \[20\] protons \[+\,\,19\] neutrons \[+\,\,20\] electrons |
| D. | \[20\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons |
| Answer» B. \[19\] protons \[+\,\,20\] neutrons \[+\,\,20\] electrons | |
| 172. |
Two bullets P and Q, masses 10g and 20 g, are moving in the same direction towards a target with velocities of 20 m/s and 10 m/s respectively. Which one of the bullets will pierce a greater distance through the target? |
| A. | P |
| B. | Q |
| C. | Both are correct |
| D. | both are incorrect |
| E. | None of these |
| Answer» B. Q | |
| 173. |
A man walks on a straight road from his home to a market 3km away with a speed of 6 km/h. The market was closed; he instantly turns and walks back with a speed of 9km/h. What is the magnitude of average velocity of the man between time interval 0 to 40 min? |
| A. | 2.25 km/h |
| B. | 6.75 km/h |
| C. | 4.5 km/h |
| D. | 7.5 km/h |
| E. | None of these |
| Answer» B. 6.75 km/h | |
| 174. |
A stone is dropped from the top of a tower of 125 m high into a pond which is at base of the tower. When will the splash be heard at the top? (Given \[g\text{ }=\text{ }10\text{ }m\text{ }{{s}^{-2}}\] and speed of sound\[=\text{ }340\text{ }m\text{ }{{s}^{-1}}\].) |
| A. | 5 s |
| B. | 0.36 s |
| C. | 5.36 s |
| D. | 2 s |
| Answer» D. 2 s | |
| 175. |
The work done by a man in holding a \[15\,\,kg\] suitcase while waiting for a bus for \[45\] minutes is |
| A. | \[675\,\,J\] |
| B. | \[405\,\,J\] |
| C. | \[450\,\,J\] |
| D. | \[zero\] |
| Answer» E. | |
| 176. |
Penetration power of proton is |
| A. | more than electron |
| B. | less than electron |
| C. | more than neutron |
| D. | None of these |
| Answer» C. more than neutron | |
| 177. |
By how much does the kinetic energy of a particle increase if the velocity is increased by a factor of three? |
| A. | \[6\] |
| B. | \[7\] |
| C. | \[8\] |
| D. | \[9\] |
| Answer» E. | |
| 178. |
A wave is produced by the ____ of the particles. |
| A. | motions |
| B. | vibrations |
| C. | rotations |
| D. | none of these |
| Answer» C. rotations | |
| 179. |
A submarine emits a SONAR pulse which returns from an underwater cliff in 1.05 second. If the speed of sound in salt water is \[1531\text{ }m\text{ }{{s}^{-1}}\], how far away is the cliff? |
| A. | \[1568\text{ }m\] |
| B. | \[803.7\text{ }m\] |
| C. | \[1607.4\text{ }m\] |
| D. | \[765.5\text{ }m\] |
| Answer» C. \[1607.4\text{ }m\] | |
| 180. |
A sound wave travelling in a medium is represented as shown in figure. If vibrating source of sound makes 360 oscillations in 2 minutes, then the amplitude, wavelength and frequency of the sound wave respectively are (Take velocity of sound as\[342\text{ }m\text{ }{{s}^{-1}}\]) |
| A. | 1 m, 114 m and 3 Hz |
| B. | 2 m, 3 m and 14 Hz |
| C. | 1 m, 5 m and 20 Hz |
| D. | 1 m, 100 m and 10 Hz. |
| Answer» B. 2 m, 3 m and 14 Hz | |
| 181. |
In which of the following diseases houseflies act as a vector? |
| A. | Cholera |
| B. | Malaria |
| C. | Dengue |
| D. | Yellow fever |
| E. | None of these |
| Answer» B. Malaria | |
| 182. |
Salmonella typhi infect the ____ of man. |
| A. | Brain |
| B. | Throat |
| C. | Intestine |
| D. | Lungs |
| E. | None of these |
| Answer» D. Lungs | |
| 183. |
The disease which is likely to occur in crowded areas. |
| A. | Noninfectious diseases |
| B. | Infectious diseases |
| C. | Genetic diseases |
| D. | Deficiency diseases |
| E. | None of these |
| Answer» C. Genetic diseases | |
| 184. |
Echo is produced due to |
| A. | reflection of sound |
| B. | resonance |
| C. | refraction of sound |
| D. | none of these |
| Answer» B. resonance | |
| 185. |
A boy of mass 50 kg runs up a flight of 120 stairs, each measuring a height of 25 cm, in one minute and 40 seconds. If \[g\text{ }=\text{ }10\text{ }m\text{ }{{s}^{-2}}\], the power of the boy is |
| A. | 150 W |
| B. | 750 W |
| C. | 500 W |
| D. | 250 W |
| Answer» B. 750 W | |
| 186. |
Who among the following are associated with\[SONAR\]? |
| A. | Sonograph |
| B. | Engineers |
| C. | Astronauts |
| D. | Navigators |
| Answer» E. | |
| 187. |
An object of mass \[1\,\,kg\] is raised through a height\['h'\]. Its potential energy is increased by\[1\,\,J\]. Find the height. |
| A. | \[0.102\,\,m\] |
| B. | \[0.105\,\,m\] |
| C. | \[0.130\,\,m\] |
| D. | \[0.110\,\,m\] |
| Answer» B. \[0.105\,\,m\] | |
| 188. |
Which of the following tissues is responsible for receiving, interpreting and producing response to stimulus? |
| A. | Muscle tissue |
| B. | Connective tissue |
| C. | Nervous tissue |
| D. | Epithelial tissue |
| Answer» D. Epithelial tissue | |
| 189. |
A car starts from rest and attains a velocity of 10 m/s in 40 s. The driver applies brakes and slow down the car to 5 m/s in 10 s. Find the acceleration of the car in both the cases. |
| A. | \[-0.25\text{ }m/{{s}^{2}}\text{ }and-0.5\text{ }m/{{s}^{2}}\] |
| B. | \[0.25\text{ }m/{{s}^{2}}and-0.5\text{ }m/{{s}^{2}}\] |
| C. | \[0.35\text{ }m/{{s}^{2}}\text{ }and-0.15\text{ }m/{{s}^{2}}\] |
| D. | \[0.45\text{ }m/{{s}^{2}}and-0.25\text{ }m/{{s}^{2}}\] |
| E. | None of these |
| Answer» C. \[0.35\text{ }m/{{s}^{2}}\text{ }and-0.15\text{ }m/{{s}^{2}}\] | |
| 190. |
Waves formed on the water surface are |
| A. | transverse |
| B. | longitudinal |
| C. | both transverse and longitudinal |
| D. | neither transverse non longitudinal |
| Answer» B. longitudinal | |
| 191. |
What is the amplitude of the wave shown in the figure? |
| A. | 8 cm |
| B. | 6 cm |
| C. | 4 cm |
| D. | 2 cm |
| Answer» D. 2 cm | |
| 192. |
Which of the following statements is correct, when two sound waves with same frequency and constant phase difference interfere? |
| A. | There is a gain of energy. |
| B. | There is a loss of energy. |
| C. | The energy is redistributed as direction change. |
| D. | The energy is redistributed and the distribution remains constant in time. |
| Answer» E. | |
| 193. |
Which of the following organs contain(s) smooth muscles? |
| A. | Iris of eye |
| B. | Uterus |
| C. | Bronchi |
| D. | All of the above |
| Answer» E. | |
| 194. |
Which of the following gas when taken in the discharge tube produces maximum specific charge of positive rays? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Helium |
| D. | Hydrogen |
| Answer» E. | |
| 195. |
Find the distance between two objects of mass 10 kg and 20 kg if a force of \[5.34\times {{10}^{-10}}N\] is acting between them. |
| A. | 10m |
| B. | 15m |
| C. | 20m |
| D. | 5m |
| E. | None of these |
| Answer» E. None of these | |
| 196. |
Which bacteria is responsible for causing typhoid? |
| A. | Salmonella typhi |
| B. | E. Coli |
| C. | Coccus |
| D. | Bacilli |
| E. | None of these |
| Answer» B. E. Coli | |
| 197. |
It is possible to distinguish between transverse and longitudinal waves by studying the property of |
| A. | interference |
| B. | diffraction |
| C. | reflection |
| D. | polarization |
| Answer» E. | |
| 198. |
Who discovered nucleus of an atom? |
| A. | Thomsons |
| B. | Golden tine |
| C. | Rutherford |
| D. | Chadwick |
| E. | None of these |
| Answer» D. Chadwick | |
| 199. |
The value of G on the surface of Jupiter is : |
| A. | \[6.67\times {{10}^{-11}}\,N{{m}^{2}}/k{{g}^{2}}\] |
| B. | \[6.67\times {{10}^{-10}}\,N{{m}^{2}}/k{{g}^{2}}\] |
| C. | \[6.67\times {{10}^{-12}}\,N{{m}^{2}}/k{{g}^{2}}\] |
| D. | \[6.67\times {{10}^{-13}}\,N{{m}^{2}}/k{{g}^{2}}\] |
| E. | None of these |
| Answer» B. \[6.67\times {{10}^{-10}}\,N{{m}^{2}}/k{{g}^{2}}\] | |
| 200. |
Which of the following is NOT a function of connective tissue? |
| A. | The production of blood cells |
| B. | Binding and supporting body parts |
| C. | Lining of body surfaces and cavities |
| D. | Storing energy in the form of fats |
| Answer» D. Storing energy in the form of fats | |