MCQOPTIONS
Saved Bookmarks
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.
| 51. |
The number of unpaired electrons in a chromic conclusion \[C{{r}^{+3}}\] (atomic number 24) is |
| A. | 6 |
| B. | 4 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 52. |
Which microorganism causes typhoid? |
| A. | Salmonella |
| B. | Protozoa |
| C. | Fungus |
| D. | Virus |
| E. | None of these |
| Answer» B. Protozoa | |
| 53. |
A longitudinal wave travels from east to west in air in which direction do the particles of air move? |
| A. | East to west |
| B. | East to west and north to south |
| C. | North to south |
| D. | South to north |
| Answer» B. East to west and north to south | |
| 54. |
A construction worker working at a height of \[78.4\,\,m\] above the ground bends and his helmet slips falls down. He hears the sound of the helmet hitting the ground \[0.23\] seconds after it slipped. Find the speed of sound in air. |
| A. | \[512\,\,m\,\,{{s}^{-1}}\] |
| B. | \[215\,\,m\,\,{{s}^{-1}}\] |
| C. | \[341\,\,m\,\,{{s}^{-1}}\] |
| D. | \[651\,\,m\,\,{{s}^{-1}}\] |
| Answer» D. \[651\,\,m\,\,{{s}^{-1}}\] | |
| 55. |
Who determined the magnitude of positive charge on the nucleus? |
| A. | Rutherford |
| B. | Bhor |
| C. | Mosley |
| D. | Chadwick |
| E. | None of these |
| Answer» D. Chadwick | |
| 56. |
Following electronic configuration violates |
| A. | only Paulis rule |
| B. | only Hund's rule |
| C. | only (n + 1) rule |
| D. | all of these |
| Answer» E. | |
| 57. |
450 g of solution contains 25 g of salt. Find the percentage by mass of sugar in the solution. |
| A. | 5.25% |
| B. | 5% |
| C. | 5.5% |
| D. | 5.75% |
| E. | None of these |
| Answer» D. 5.75% | |
| 58. |
In which of the following examples mechanical energy is transformed into heat energy? |
| A. | Electrolysis |
| B. | Rubbing two pieces of stone to generate fire. |
| C. | Burning of magnesium. |
| D. | In steam engine. |
| E. | None of these |
| Answer» C. Burning of magnesium. | |
| 59. |
The energy consumed in KWh in 6 hours by 2 devices of power 500W each. |
| A. | 5000 kwh |
| B. | 5 kwh |
| C. | 2.5 kwh |
| D. | 2500 kwh |
| E. | None of these |
| Answer» C. 2.5 kwh | |
| 60. |
Which one of the following gas is the major constituent for the depletion of ozone layer? |
| A. | PbO |
| B. | CO |
| C. | CFC |
| D. | \[N{{O}_{2}}\] |
| E. | Non of these |
| Answer» D. \[N{{O}_{2}}\] | |
| 61. |
Mechanical energy of a system is equal to _____ |
| A. | \[mgh+\frac{1}{2}m{{v}^{2}}\] |
| B. | \[mg+m{{v}^{2}}\] |
| C. | \[mgh+\frac{1}{2}m\] |
| D. | \[mgh+\frac{1}{2}{{v}^{2}}\] |
| E. | None of these |
| Answer» B. \[mg+m{{v}^{2}}\] | |
| 62. |
Law of conservation of energy states that_____. |
| A. | Total energy of system remains constant. |
| B. | Energy cannot be created or destroyed. |
| C. | There is no gain or loss of energy in a system. |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 63. |
What is the work done in lifting a mass of 10 kg at a height of 100 cm? |
| A. | 90 J |
| B. | 98 J |
| C. | 96 J |
| D. | 92 J |
| E. | None of these |
| Answer» C. 96 J | |
| 64. |
Which of the following are complex tissues? |
| A. | Parenchyma and collenchyma |
| B. | Collenchyma and sclerenchyma |
| C. | Xylem and phloem |
| D. | Xylem and Parenchyma |
| Answer» D. Xylem and Parenchyma | |
| 65. |
A block of mass \[1\,\,kg\] slides down on an inclined plane with the angle of inclination of\[{{30}^{o}}\]. Find the work done as the block slides through\[50\,\,cm\]. |
| A. | \[3.45\,\,J\] |
| B. | \[5.30\,\,J\] |
| C. | \[2.45\,\,J\] |
| D. | \[4.50\,\,J\] |
| Answer» D. \[4.50\,\,J\] | |
| 66. |
There are two atomic species X and Y, such that Atomic species X Y Protons 8 8 Neutrons 8 10 Which of the following statements is true about X and Y? |
| A. | X and Y are isobars. |
| B. | X and Y have different chemical properties. |
| C. | X and Y have different physical properties. |
| D. | All are correct. |
| Answer» D. All are correct. | |
| 67. |
An elevator is designed to lift a load of 1000 kg, through 6 floors of a building averaging \[\text{3}\text{.5 m}\]per floor in 6 sec. Power of the elevator, neglecting other losses, will be |
| A. | \[\text{3}\text{.43 }\times \text{ 1}{{0}^{\text{4}}}\text{ watt}\] |
| B. | \[\text{4}\text{.33 }\times \text{ 1}{{0}^{\text{4}}}\text{ watt}\] |
| C. | \[\text{2}\text{.21 }\times \text{ 1}{{0}^{\text{4}}}\text{ watt}\] |
| D. | \[\text{5}\text{.65 }\times \text{ 1}{{0}^{\text{4}}}\text{ watt}\] |
| Answer» B. \[\text{4}\text{.33 }\times \text{ 1}{{0}^{\text{4}}}\text{ watt}\] | |
| 68. |
The greater the surface area of the vibrating body, the ___ is the loudness of sound. |
| A. | lesser |
| B. | greater |
| C. | remains same |
| D. | none of these |
| Answer» C. remains same | |
| 69. |
The tissue shown in the given figure is |
| A. | Angular collenchyma, in which wall thickenings are present at the angles |
| B. | Sclerenchyma, in which uniform wall thickenings are present |
| C. | Xylem fibres with narrow central lumen |
| D. | Phloem parenchyma with abundant food reserve. |
| Answer» B. Sclerenchyma, in which uniform wall thickenings are present | |
| 70. |
Match column I with column II and select the correct option from the given codes. Column I Column II (a) (i) Phagocytosis (b) (ii) Blood clotting (c) (iii) Transport of oxygen |
| A. | (a)-(i), (b)-(ii), (c)-(iii) |
| B. | (a)-(ii), (b)-(iii), (c)-(i) |
| C. | (a)-(i), (b)-(iii), (c)-(ii) |
| D. | (a)-(iii), (b)-(i), (c)-(ii) |
| Answer» E. | |
| 71. |
A wave source produces \[10\] oscillations in\[100\,\,m\,\,s\]. Find the time period of the wave. |
| A. | \[1\] second |
| B. | \[0.01\]second |
| C. | \[10\] second |
| D. | \[0.1\]second |
| Answer» C. \[10\] second | |
| 72. |
Ultrasonic waves are used for stirring liquid solutions because |
| A. | they do not produce noise during the operation |
| B. | they do not produce chemical reactions in the solutions |
| C. | they are easy to produce |
| D. | they can produce perfectly homogeneous solutions |
| Answer» E. | |
| 73. |
Density of neutron is of the order of |
| A. | \[\text{1}{{0}^{\text{3}}}\text{ kg}/\text{cc}\] |
| B. | \[\text{1}{{0}^{\text{6}}}\text{ kg}/\text{cc}\] |
| C. | \[\text{1}{{0}^{\text{12}}}\text{ kg}/\text{cc}\] |
| D. | \[\text{1}{{0}^{\text{2}}}\text{ kg}/\text{cc}\] |
| Answer» D. \[\text{1}{{0}^{\text{2}}}\text{ kg}/\text{cc}\] | |
| 74. |
Loudness is ___ in dry air than in moist air which is lighter. |
| A. | less |
| B. | more |
| C. | sometimes (a) , sometimes (b) |
| D. | none |
| Answer» C. sometimes (a) , sometimes (b) | |
| 75. |
The given figure shows the wave generated on a The amplitude of the wave is |
| A. | 5 cm |
| B. | 7 cm |
| C. | 10 cm |
| D. | 14 cm |
| Answer» C. 10 cm | |
| 76. |
If a wave completes 20 vibrations in 2.5 s, then its frequency is |
| A. | 20 Hz |
| B. | 8 Hz |
| C. | 200 Hz |
| D. | 50 Hz |
| Answer» C. 200 Hz | |
| 77. |
Statement A: A female voice is more shrill than the male voice. Statement B: A father's voice is more shrill than his son's voice. |
| A. | only statement A is true |
| B. | only statement B is true |
| C. | both the statements are true |
| D. | both the statements are false |
| Answer» B. only statement B is true | |
| 78. |
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium. |
| A. | 3 m |
| B. | 5 m |
| C. | 2 m |
| D. | 4 m |
| Answer» D. 4 m | |
| 79. |
A ball comes back after an elastic collision with a wall. If initial momentum of the ball is P, the impulse on the wall after the collision is |
| A. | \[P\] |
| B. | \[2P\] |
| C. | zero |
| D. | \[-2P\] |
| Answer» C. zero | |
| 80. |
Kilowatt hour (\[\text{kWh}\]) represents the unit of |
| A. | power |
| B. | impulse |
| C. | momentum |
| D. | none of these |
| Answer» E. | |
| 81. |
The potential energy of a certain spring when stretched through a distance 'S' is 10 joules. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance "S" will be |
| A. | 30 |
| B. | 40 |
| C. | 10 |
| D. | 20 |
| Answer» B. 40 | |
| 82. |
An object of 10 kg moves with a uniform velocity of 2 m/s, what is the kinetic energy possessed by the object? |
| A. | 20 J |
| B. | 10 J |
| C. | 40 J |
| D. | 30 J |
| E. | None of these |
| Answer» B. 10 J | |
| 83. |
A particle moving along a line travels a distance of 10 m under the action of a force of 5 N. If the work done is 25 J, then the angle between the force and the direction of motion is |
| A. | \[0{}^\circ \] |
| B. | \[30{}^\circ \] |
| C. | \[45{}^\circ \] |
| D. | \[60{}^\circ \] |
| Answer» E. | |
| 84. |
A person lifts a luggage of 10 kg at the height of 2 m above the ground. What is the potential energy possessed by the luggage? |
| A. | 180 J |
| B. | 196 J |
| C. | 20 J |
| D. | 10 J |
| E. | None of these |
| Answer» C. 20 J | |
| 85. |
Direction: Refer to the given Venn diagram and answer the following question. Select the option that correctly identifies any two of the diseases. |
| A. | P - Cholera,Q - Cancer |
| B. | R - Hepatitis,S - Anaemia |
| C. | T - Measles,U - Rhinitis |
| D. | V - AIDS,R - Gonorrhoea |
| Answer» E. | |
| 86. |
Direction: Refer to the given Venn diagram and answer the following question. Which of the following holds true regarding the viral disease that you identified to be correct? |
| A. | It has no vaccines as of now. |
| B. | Its causal organism has RNA as genetic material. |
| C. | It can be transferred from mother to fetus through placenta. |
| D. | All of these |
| Answer» E. | |
| 87. |
What is the ratio of the neutrons present in carbon and silicon atoms with respect to their atomic masses? (Atomic mass of carbon and silicon are \[12\] and \[28\] respectively) |
| A. | \[3:7\] |
| B. | \[7:3\] |
| C. | \[3:4\] |
| D. | \[6:28\] |
| Answer» B. \[7:3\] | |
| 88. |
Match the entries in Column j with those in Column II correctly. Column-I Column-II[a]Microphone1.Wind energy into mechanical energy[b]Speaker2.Mechanical energy into sound energy[c]Reeds of a harmonium3.Electrical energy into sound energy[d]Sails of a ship4.Sound energy into electrical energy |
| A. | a - 4, b - 3, c - 1, d - 2 |
| B. | a - 1, b - 2, c - 3, d - 4 |
| C. | a - 4, b - 2, c - 3, d - 1 |
| D. | a - 4, b - 3, c - 2, d - 1 |
| Answer» E. | |
| 89. |
A block of wood of mass \[250\,\,g\] is moving at a speed of\[4\,\,m\,\,{{s}^{-1}}\]. Find its \[K.E.\] in Joules. |
| A. | \[4J\] |
| B. | \[2J\] |
| C. | \[1J\] |
| D. | \[10J\] |
| Answer» C. \[1J\] | |
| 90. |
What is the distance between a crest and a trough in a wave? |
| A. | \[\lambda \] |
| B. | \[\frac{\lambda }{2}\] |
| C. | \[\frac{\lambda }{4}\] |
| D. | \[B\lambda \] |
| Answer» C. \[\frac{\lambda }{4}\] | |
| 91. |
A ball of mass \[2\,\,kg\] and another of mass \[4\,\,kg\] are dropped together from a \[60\] feet tall building. What will be the ratio of their kinetic energies after a fall of \[30\] feet? |
| A. | \[\sqrt{2}:1\] |
| B. | \[1:4\] |
| C. | \[1:2\] |
| D. | \[1:\sqrt{2}\] |
| Answer» D. \[1:\sqrt{2}\] | |
| 92. |
____ is a ____ which causes sleeping sickness. |
| A. | Salmonella typhi, bacteria |
| B. | HIV, virus |
| C. | Trypanosoma, protozoa |
| D. | Staphylococci, bacteria |
| E. | None of these |
| Answer» D. Staphylococci, bacteria | |
| 93. |
Which among the following is caused due to excessive fluorine in drinking water? |
| A. | Chicken pox |
| B. | Swelling of legs |
| C. | Mottling of teeth |
| D. | Common cold |
| E. | None of these |
| Answer» D. Common cold | |
| 94. |
Radius of atom is of the order |
| A. | \[{{10}^{-10}}-{{10}^{-8}}cm\] |
| B. | \[{{10}^{-12}}-{{10}^{-14}}cm\] |
| C. | \[{{10}^{-14}}-{{10}^{-16}}cm\] |
| D. | \[{{10}^{-16}}-{{10}^{-20}}cm\] |
| Answer» B. \[{{10}^{-12}}-{{10}^{-14}}cm\] | |
| 95. |
There are three sources of sound of equal intensity with frequencies 400, 401, 402 vibrations /sec. The number of beats heard per second I s |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» B. 2 | |
| 96. |
Remaining part of atom except outer orbit is called |
| A. | kernel |
| B. | core |
| C. | empty |
| D. | none of these |
| Answer» B. core | |
| 97. |
When the force applied and the displacement of the body are inclined at \[30{}^\circ \] with each other, then work done is |
| A. | infinite |
| B. | maximum |
| C. | zero |
| D. | unity |
| Answer» D. unity | |
| 98. |
A pen is dropped from a height H. When it reaches the ground, its velocity is\[50\text{ }m/s\]. The value of H is\[\left( g=9.8\,m/{{s}^{2}} \right)\]: |
| A. | 55 m |
| B. | 127.5 m |
| C. | 105 m |
| D. | 120 m |
| E. | None of these |
| Answer» C. 105 m | |
| 99. |
What is the wavelength of the given wave? |
| A. | 5 cm |
| B. | 6 cm |
| C. | 10 cm |
| D. | 12 cm |
| Answer» D. 12 cm | |
| 100. |
Explanation of the presence of three unpaired electrons in nitrogen atom is given by |
| A. | Fault's principle |
| B. | Hund's rule |
| C. | Aufbau principle |
| D. | Uncertainty principle |
| Answer» C. Aufbau principle | |