MCQOPTIONS
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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.
| 1701. |
A man stands at a distance of 255m from a cliff. He fires a gun and heard the echo after 1.5 seconds. What will be the velocity of the sound? |
| A. | 330 m/s |
| B. | 340 m/s |
| C. | 320 m/s |
| D. | 335 m/s |
| Answer» C. 320 m/s | |
| 1702. |
In a wave motion, the particles oscillate perpendicular to the direction of wave propagation. The wave is |
| A. | transverse |
| B. | longitudinal |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. longitudinal | |
| 1703. |
If you hear a gunshot 2 seconds after it is fired, how far away from the gun are you? (speed of sound in air = 330 m/s) |
| A. | 330 m |
| B. | 335 m |
| C. | 320 m |
| D. | 325 m |
| Answer» B. 335 m | |
| 1704. |
Two wave of the same pitch have amplitude in the ratio 1 : 2. What will be the ratio of their loudness? |
| A. | 0.0444444444444444 |
| B. | 0.04375 |
| C. | 0.0458333333333333 |
| D. | 0.0430555555555556 |
| Answer» B. 0.04375 | |
| 1705. |
The ___ is a disturbance by which energy is transfer without the transport of matter. |
| A. | wave |
| B. | heat |
| C. | light |
| D. | none of these |
| Answer» B. heat | |
| 1706. |
Sound waves are |
| A. | longitudinal |
| B. | transverse |
| C. | partly longitudinal, partly transverse |
| D. | sometimes longitudinal, sometimes transverse. |
| Answer» B. transverse | |
| 1707. |
Light wave is an example of |
| A. | longitudinal wave |
| B. | electromagnetic wave |
| C. | transverse wave |
| D. | both (b) & (c) |
| Answer» E. | |
| 1708. |
The technique used by bats to find their way or to locate food is __. |
| A. | SONAR |
| B. | RADAR |
| C. | Echolocation |
| D. | Flapping |
| Answer» D. Flapping | |
| 1709. |
Which bacteria is responsible for nitrification in nitrogen cycle? |
| A. | Nitrosomonasand Nitrobactor |
| B. | Clostridium |
| C. | Rhizobium |
| D. | Nitrosomonas |
| Answer» B. Clostridium | |
| 1710. |
Which of the following could be the after effect of soil erosion? |
| A. | Drought |
| B. | Flood |
| C. | Landslide |
| D. | All the above |
| Answer» E. | |
| 1711. |
Oxides of ________are released in atmosphere, when fossil fuel is burnt. |
| A. | Uranium |
| B. | Nitrogen |
| C. | Sulphur |
| D. | Both [b] and [c] |
| Answer» E. | |
| 1712. |
Which of the following natural processes play(s) a role in the nitrogen cycle? |
| A. | Lightning |
| B. | Flood |
| C. | Storm |
| D. | All of these |
| Answer» B. Flood | |
| 1713. |
The process of conversion of ammonia into nitrates is called: |
| A. | Ammonification |
| B. | Nitrification |
| C. | Photosynthesis |
| D. | Respiration |
| Answer» C. Photosynthesis | |
| 1714. |
Which of the following types of soil is very fertile and enriched with organic material? |
| A. | Chalky |
| B. | Loamy |
| C. | Silty |
| D. | Clayey |
| Answer» C. Silty | |
| 1715. |
Which of the following damages ozone layer? |
| A. | Chlorine |
| B. | Fluorine |
| C. | Hydrogen |
| D. | CFCs |
| Answer» E. | |
| 1716. |
Which of the following represents the correct formula of ozone? |
| A. | \[Ozn\] |
| B. | \[{{O}_{2}}Zn\] |
| C. | \[{{O}_{3}}Zn\] |
| D. | \[{{O}_{3}}\] |
| Answer» E. | |
| 1717. |
Read the given paragraph.Soil X has very poor water holding capacity, soil Vis well drained and contains one part clay and two parts each of sand and silt. Soil Z has excellent water holding capacity but is poorly aerated.Select the correct statement regarding soils X, Y and Z. |
| A. | Soil X is commonly found in those regions where xerophytes are abundant. |
| B. | Soil Z is best suited for growth of plants like Casuarina, Eucalyptus and watermelon. |
| C. | Soil Y is best suited for making pots. |
| D. | All of these |
| Answer» B. Soil Z is best suited for growth of plants like Casuarina, Eucalyptus and watermelon. | |
| 1718. |
Select the option that correctly identifies X and Y in the given flow chart. |
| A. | X Y Ecological BHC |
| B. | X Y Biological Fertiliser |
| C. | X Y Biological Heat |
| D. | X Y Ecological Bacteria |
| Answer» D. X Y Ecological Bacteria | |
| 1719. |
Some water falling on ground, forms an extremely thin, tightly held film around the soil particles called _____ while some water moves down upto the water table and is called _____.Select the option that correctly fills the blanks in the above statement. |
| A. | Gravitational water, capillary water |
| B. | Hygroscopic water, surface runoff |
| C. | Hygroscopic water, gravitational water |
| D. | Capillary water, surface runoff |
| Answer» D. Capillary water, surface runoff | |
| 1720. |
Water is recycled in nature through the water cycle. Which of the following processes are involved in the water cycle the most? |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» B. (i) and (iii) | |
| 1721. |
Which of the following gases cause acid rain? |
| A. | Carbon monoxide and carbon dioxide. |
| B. | Sulphur dioxide and oxides of nitrogen. |
| C. | Oxides of nitrogen and carbon dioxide. |
| D. | None of these. |
| Answer» C. Oxides of nitrogen and carbon dioxide. | |
| 1722. |
The diagram shows the phenomenon of a natural disaster. Which of the following is an effect of the disaster? |
| A. | Air pollution |
| B. | Greenhouse effect |
| C. | Water pollution |
| D. | Sound pollution |
| Answer» C. Water pollution | |
| 1723. |
A non-renewable source of energy is: |
| A. | Solar energy |
| B. | Wind energy |
| C. | Tidal energy |
| D. | Natural gas |
| Answer» E. | |
| 1724. |
____ are known as producers of an ecosystem. |
| A. | Microorganisms |
| B. | Animals |
| C. | Green plants |
| D. | Clouds |
| Answer» D. Clouds | |
| 1725. |
One of the following factors does not lead to soil formation in nature: |
| A. | The sun |
| B. | Water |
| C. | Wind |
| D. | Polythene bags |
| Answer» E. | |
| 1726. |
Identify P in the given carbon cycle. |
| A. | Carbon compounds in animals |
| B. | Carbon compounds in plants |
| C. | Carbon dioxide in the air |
| D. | Coal and oil |
| Answer» D. Coal and oil | |
| 1727. |
The vertical movement of air is: |
| A. | Wind current |
| B. | Wind |
| C. | Air cycle |
| D. | Smog |
| Answer» B. Wind | |
| 1728. |
Which one of the following processes does not lead to loss of oxygen from atmosphere? |
| A. | Respiration |
| B. | Surface weathering of exposed rocks. |
| C. | Break down of water by ultraviolet radiations into component molecules. |
| D. | Formation of carbonate shell materials by marine organisms. |
| Answer» D. Formation of carbonate shell materials by marine organisms. | |
| 1729. |
How does photosynthesis help to maintain the percentage of oxygen and carbon dioxide in the atmosphere? |
| A. | By giving off carbon dioxide and absorbing oxygen. |
| B. | By giving off oxygen and absorbing carbon dioxide. |
| C. | By releasing oxygen and carbon dioxide. |
| D. | By absorbing oxygen and carbon dioxide. |
| Answer» C. By releasing oxygen and carbon dioxide. | |
| 1730. |
Which of the following steps are used to treat industrial wastes and reduce pollution? |
| A. | Only (i) and (iii) |
| B. | Only (i) and (ii) |
| C. | Only (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» B. Only (i) and (ii) | |
| 1731. |
At what temperature water has highest density? |
| A. | \[0{}^\circ C\] |
| B. | \[4{}^\circ C\] |
| C. | \[10{}^\circ C\] |
| D. | \[20{}^\circ C\] |
| Answer» C. \[10{}^\circ C\] | |
| 1732. |
Which one of the following statements is correct? Statements 1: Physical state of a substance can be changed by changing its temperature Statement 2: Physical state of a substance can be changed by changing pressure |
| A. | Statement 1 |
| B. | Statement 2 |
| C. | Both statements are correct |
| D. | Both statements are incorrect |
| Answer» D. Both statements are incorrect | |
| 1733. |
The temperature at which a solid substance melts at atmospheric pressure is called its: |
| A. | Melting point |
| B. | Boiling point |
| C. | Ignition temperature |
| D. | Latent heat |
| Answer» B. Boiling point | |
| 1734. |
In which one of the following states of matter, maximum movement of molecules is noticed? |
| A. | Solid |
| B. | Liquid |
| C. | Gas |
| D. | All the above |
| Answer» D. All the above | |
| 1735. |
Which of the following statements are correct? I. Temperature changes during the change of a state. II. Dry ice gets converted directly into gaseous state under normal atmospheric conditions. III. Higher boiling point of liquid indicates weaker intermolecular forces. IV. Latent heat of vaporisation is generally higher than the latent heat of fusion for a substance. |
| A. | I and IV |
| B. | II and IV |
| C. | II and III |
| D. | III and IV |
| Answer» C. II and III | |
| 1736. |
In which of the following colloids the dispersion medium is solid? |
| A. | Whipped Cream |
| B. | Marshmallow |
| C. | Paint |
| D. | Mayonnaise |
| Answer» C. Paint | |
| 1737. |
Which of the following conditions is essential for using fractional distillation as a method for separation of the components from mixture? (i) The components must differ in their boiling points atleast by\[{{15}^{o}}C\]. (ii) The components must have same boiling points. (iii) The components must be miscible with each other. (iv)The components, must be immiscible with each other. |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (i) and (iii) |
| Answer» E. | |
| 1738. |
Which one of the following substances does not undergo sublimation? |
| A. | Ammonium chloride |
| B. | Iodine |
| C. | Dry ice |
| D. | Ice |
| Answer» E. | |
| 1739. |
A class teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below. What could be the probable thermometer readings recorded during the experiment? |
| A. | \[{{97}^{o}}C\] |
| B. | \[{{100}^{o}}C\] |
| C. | \[{{102}^{o}}C\] |
| D. | \[{{99}^{o}}C\] |
| Answer» D. \[{{99}^{o}}C\] | |
| 1740. |
Look at the Venn diagram given below. Which of the following can be placed in\['Z'\]? |
| A. | Water |
| B. | Dry ice |
| C. | Salt |
| D. | Jelly |
| Answer» B. Dry ice | |
| 1741. |
The solubility of a solute 'X' in water is 35 g in 100 g of water. The density of the solution is \[1.5m{{l}^{-1}}\]The concentration of ?x? in the solution in % (m/v) is: |
| A. | 0.6 |
| B. | 0.3888 |
| C. | 0.34 |
| D. | 0.88 |
| Answer» C. 0.34 | |
| 1742. |
A solution is prepared by dissolving 20 g of NaCl in 200 g of water. Find the concentration of the solution. |
| A. | 0.111 |
| B. | 0.0901 |
| C. | 0.08 |
| D. | 0.1 |
| Answer» C. 0.08 | |
| 1743. |
How much of a given substance is mixed with another substances is defined by ____ of a solution. |
| A. | Temperature |
| B. | Concentration |
| C. | Solvent |
| D. | Humidity |
| Answer» C. Solvent | |
| 1744. |
What is the \[S.I.\] unit of temperature? |
| A. | Centigrade |
| B. | Fahrenheit |
| C. | Kelvin |
| D. | All of the above |
| Answer» D. All of the above | |
| 1745. |
Which one of the following shows the process of electrophoresis? |
| A. | True solution |
| B. | Colloid |
| C. | Suspension |
| D. | All the above |
| Answer» C. Suspension | |
| 1746. |
What happens when a solid melts? |
| A. | Its molecules move farther apart. |
| B. | Its molecules move closer. |
| C. | The movement of its molecules decreases. |
| D. | The temperature decreases although heat is supplied. |
| Answer» B. Its molecules move closer. | |
| 1747. |
The given apparatus is used to study the diffusion of a number of gases at the same temperature and pressure.Which of the following pairs of gases would diffuse into the vacuum at the same speed?[Given: Atomic mass of H=1u, C=12u, N=14u, S=32u, O=16u] |
| A. | \[\text{N}{{\text{H}}_{\text{3}}}\] and \[{{\text{H}}_{2}}\] |
| B. | \[\text{CO}\] and\[\text{S}{{\text{O}}_{2}}\] |
| C. | \[\text{CO}\] and\[{{\text{N}}_{2}}\] |
| D. | \[\text{N}{{\text{H}}_{\text{3}}}\] and \[{{\text{N}}_{\text{2}}}\] |
| Answer» D. \[\text{N}{{\text{H}}_{\text{3}}}\] and \[{{\text{N}}_{\text{2}}}\] | |
| 1748. |
In which one of the following physical states of a substance force of attraction between molecules is maximum? |
| A. | Solid |
| B. | Liquid |
| C. | Gas |
| D. | All the above |
| Answer» B. Liquid | |
| 1749. |
Which of the following is a mixture? |
| A. | Water |
| B. | Methane |
| C. | Mercury |
| D. | Solution of sugar and water |
| Answer» E. | |
| 1750. |
Which one of the following statements is correct? Statement 1: If temperature of a solid substance is increased, the force of attraction between its molecules will also increase Statement 2: If temperature of a solid substance is increased, the force of attraction between its molecules will decrease |
| A. | Statement 1 only |
| B. | Statement 2 only |
| C. | Both statements are correct |
| D. | Both statements are incorrect |
| Answer» C. Both statements are correct | |