MCQOPTIONS
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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
An echo of the sound produced can be heard only if it reaches our ear after |
| A. | \[\frac{1}{15}\]th of a second |
| B. | \[\frac{1}{13}\]th of a second |
| C. | \[\frac{1}{10}\]th of a second |
| D. | \[\frac{1}{5}\]th of a second |
| Answer» D. \[\frac{1}{5}\]th of a second | |
| 102. |
The speed of a sound in gas |
| A. | Decreases with increases in temperature |
| B. | Independent if temperature |
| C. | Increases with increase in temperature |
| D. | First decreases and then increases with Temperature |
| Answer» D. First decreases and then increases with Temperature | |
| 103. |
A tuning fork sends sound waves in air. If the temperature of air increases, which of the following parameters will change? |
| A. | Time period |
| B. | Frequency |
| C. | Wavelength |
| D. | All of these |
| Answer» D. All of these | |
| 104. |
Read the given statements and select the correct option. Statement 1: Sound would travel faster on a hot summer day than on a cold winter day. Statement 2: Velocity of sound depends on temperature. |
| A. | Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. |
| B. | Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. |
| C. | Statement 1 is true and statement 2 is false. |
| D. | Both statements 1 and 2 are false. |
| Answer» B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. | |
| 105. |
Identify the reaction given below \[6C{{O}_{2}}+6{{H}_{2}}O+Light\,energy\,\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}\] |
| A. | (a) Combination reaction |
| B. | (b) Reduction reaction |
| C. | (c) Respiration reaction |
| D. | (d) Photosynthesis |
| E. | (e) None of these |
| Answer» E. (e) None of these | |
| 106. |
What is the process of taking out silk threads from the cocoon known as? |
| A. | Rearing |
| B. | Sorting |
| C. | Scouring |
| D. | Reeling |
| Answer» E. | |
| 107. |
The chemical decomposition produced by passing an electric current through a conducting liquid is called : |
| A. | Combination |
| B. | Electroplating |
| C. | Electrolysis |
| D. | All of these |
| E. | None of these |
| Answer» D. All of these | |
| 108. |
Statement I: Pressure is the force acting per unit area of the surface. Statement II: Force acting perpendicular to the surface is called thrust. |
| A. | Statement I is correct |
| B. | Statement II is correct |
| C. | Both the statement are correct |
| D. | Both the statement is incorrect |
| E. | None of these |
| Answer» D. Both the statement is incorrect | |
| 109. |
Which one of the following process is involved in the process of soil preparation? |
| A. | Ploughing, levelling, showing |
| B. | Ploughing, levelling. Manuring |
| C. | Levelling, manuring, irrigation |
| D. | Ploughing, leveling, irrigation, showing |
| E. | None of these |
| Answer» C. Levelling, manuring, irrigation | |
| 110. |
On what factors does the loudness or intensity of sound depend? |
| A. | The amplitude of a sound wave |
| B. | The area of a vibrating body |
| C. | Distance from the source of sound |
| D. | All of the above |
| Answer» B. The area of a vibrating body | |
| 111. |
A ship sends a signal and receives it back from the bottom of the sea after 6s. What is the depth of the sea at that place? (speed of sound in sea water is \[1450\text{ }m{{s}^{-1}}\]) |
| A. | 4.35 km |
| B. | 3.35 km |
| C. | 435 km |
| D. | 335 km |
| Answer» B. 3.35 km | |
| 112. |
The innermost zone of a flame is: |
| A. | Yellow |
| B. | Blue |
| C. | Black |
| D. | White |
| E. | None of these |
| Answer» D. White | |
| 113. |
What happens when water vapour changes to liquid in the form of rain drops? |
| A. | Heat is absorbed. |
| B. | Heat is released. |
| C. | Heat is first absorbed and then released. |
| D. | There is no release of heat. |
| Answer» C. Heat is first absorbed and then released. | |
| 114. |
Two cars, X of mass 1500 kg and velocity 25 m/s and car Y of mass 1000 kg and velocity 15 m/s are moving towards each other head on. After collision, the velocity of the car X becomes 20 m/s. Find the velocity of car Y after the collision. |
| A. | 20 m/s |
| B. | 21.5 m/s |
| C. | 22.5 m/s |
| D. | 25 m/s |
| E. | None of these |
| Answer» D. 25 m/s | |
| 115. |
Which is the nearest galaxy to our galaxy? |
| A. | Andromeda |
| B. | X 31 |
| C. | Large magellanic cloud |
| D. | Small magellanic cloud |
| Answer» B. X 31 | |
| 116. |
Name the process of transferring charge from a charged body to the earth. |
| A. | Discharging |
| B. | Electrolysis |
| C. | Hydrolysis |
| D. | Earthing |
| E. | None of these |
| Answer» E. None of these | |
| 117. |
Which one of the following is a negatively charged particle? |
| A. | Electron |
| B. | Proton |
| C. | Neutron |
| D. | All the above |
| E. | None of these |
| Answer» B. Proton | |
| 118. |
Which of the following frequencies cannot be heard by human beings? |
| A. | 1000 Hz |
| B. | 10,000 Hz |
| C. | 100 Hz |
| D. | 1, 00, 000 Hz |
| Answer» E. | |
| 119. |
Which one of the following devices is used to detect electric charge on an object? |
| A. | (a) Seismograph |
| B. | (b) Seismometre |
| C. | (c) Ritcher scale |
| D. | (d) Electroscope |
| E. | (e) None of these |
| Answer» E. (e) None of these | |
| 120. |
When you touch a charged body, the charge flows through you into the earth. What is this called? |
| A. | Induction |
| B. | Conduction |
| C. | Capacitance |
| D. | Earthing |
| Answer» E. | |
| 121. |
Fruits have characteristic smells. Which of these chemicals is responsible for it? |
| A. | Yeast |
| B. | Alcohol |
| C. | Cellulose |
| D. | Esters |
| Answer» E. | |
| 122. |
The two lens of different power are given as shown below in the figure. When both the lens is placed in contact with each other, the focal length of the combined lens is: |
| A. | 20 diopter |
| B. | 22 diopter |
| C. | 24 diopter |
| D. | 16 diopter |
| E. | None of these |
| Answer» D. 16 diopter | |
| 123. |
We know that RNA is the first information storing molecule, which stores genetic information's and helps in transmission of character form one generation to the next. But, the primary method, in which genetic information is stored and transmitted from one generation to the next is: |
| A. | ATP |
| B. | DNA |
| C. | ADP |
| D. | M-RNA |
| E. | None of these |
| Answer» C. ADP | |
| 124. |
To an astronaut, the outer space appears |
| A. | Dark blue |
| B. | White |
| C. | Black |
| D. | Dark red. |
| Answer» D. Dark red. | |
| 125. |
Hary says water exerts pressure on the bottom of the bucket, but Robert says water exerts pressure on the wall of the bucket. Whose statement is correct? |
| A. | Hary |
| B. | Robert |
| C. | Both |
| D. | The statement is irrelevant |
| E. | None of these |
| Answer» D. The statement is irrelevant | |
| 126. |
We breathe in or out air with the help of windpipe called trachea. The trachea does not collapse during the breathing process, because it is made up of ring of soft bones called: |
| A. | (a) Ribs |
| B. | (b) Cardiac muscles |
| C. | (c) Cartilage |
| D. | (d) Ligaments |
| E. | (e) None of these |
| Answer» D. (d) Ligaments | |
| 127. |
Which of the following is an example of a heavily cross linked polymer? |
| A. | Melamine |
| B. | Polythene |
| C. | Nylon |
| D. | Polyester |
| Answer» B. Polythene | |
| 128. |
The figure given below represents one of the method of irrigation followed by the farmer. Identify the methods of irrigation in the figure given below. |
| A. | Drip irrigation |
| B. | Sprinkle irrigation |
| C. | Channel irrigation |
| D. | Pump irrigation |
| E. | None of these |
| Answer» C. Channel irrigation | |
| 129. |
There is a significant relationship between human and the environment. Now human being has also realized the importance of environment for the entire life form on the earth. Which one of the following is not the reason for optimism, that human is not heading into an environmental battle field? |
| A. | Development of technology for alternative source of energy |
| B. | Understanding the importance of environment |
| C. | The development of genetic modification technology |
| D. | Understanding of environmental science by human |
| E. | None of these |
| Answer» B. Understanding the importance of environment | |
| 130. |
Who proved that the planets revolve around the sun in elliptical orbits? |
| A. | Isaac Newton |
| B. | Albert Einstein |
| C. | Johannes Kepler |
| D. | Galilei Galileo |
| Answer» D. Galilei Galileo | |
| 131. |
What happens to the pitch, when we tighten the strings of a guitar? |
| A. | It increases |
| B. | It decreases |
| C. | It remains the same |
| D. | It may increase or decrease |
| Answer» B. It decreases | |
| 132. |
A person can hear an approaching train when he presses his ear to the railway track faster than one who simply stands on the tracks. What makes this possible? |
| A. | The vibration of railway tracks |
| B. | The vibration of air |
| C. | The speed of sound in solids is more |
| D. | The hearing ability of the man |
| Answer» D. The hearing ability of the man | |
| 133. |
Which one of the following are homologues organ? (1) (2) (3) (4) |
| A. | 1, 2 |
| B. | 2, 3 |
| C. | 3, 4 |
| D. | 4, 1 |
| E. | None of these |
| Answer» B. 2, 3 | |
| 134. |
Which one of the following not correct about plastics? |
| A. | Plastics can be moulded into different shapes |
| B. | Plastics are good conductor of heat and electricity |
| C. | Plastics are chemically unreactive |
| D. | Plastics are light, strong and durable |
| E. | None of these |
| Answer» C. Plastics are chemically unreactive | |
| 135. |
Which of these clothes dry faster in rainy season? |
| A. | Cotton |
| B. | Wool |
| C. | Polyester |
| D. | Silk |
| Answer» D. Silk | |
| 136. |
Match the following: Position of object Position of image (1) Between pole and focus At F (2) Between F and C At C (3) At C Behind the mirror (4) At infinity Beyond C |
| A. | 1-A, 2-B, 3-D, 4-C |
| B. | 1-C, 2-D, 3-B, 4-A |
| C. | 1-C, 2-A, 3-D, 4-B |
| D. | 1-B, 2-C, 3-D, 4-A |
| E. | None of these |
| Answer» C. 1-C, 2-A, 3-D, 4-B | |
| 137. |
The sound travels fastest is_______ |
| A. | Solids |
| B. | Liquids |
| C. | Gases |
| D. | None of these |
| Answer» B. Liquids | |
| 138. |
Which of the following statements is correct about galaxies? |
| A. | They move towards each other. |
| B. | They move away from each other. |
| C. | They do not move at all. |
| D. | They have fixed number of stars. |
| Answer» C. They do not move at all. | |
| 139. |
Identify the closest star to our solar system. |
| A. | Proxima centauri |
| B. | Sirius |
| C. | Swati |
| D. | Ashwini |
| Answer» B. Sirius | |
| 140. |
Which of the following is expressed in decibels? |
| A. | Loudness and amplitude of sound |
| B. | Loudness and pitch of sound |
| C. | Amplitude and pitch of sound |
| D. | Frequency of sound |
| Answer» B. Loudness and pitch of sound | |
| 141. |
1 light year is equal to ___ km. |
| A. | \[9.46\times {{10}^{12}}\,\,km\] |
| B. | \[9.46\times {{10}^{15}}\,\,km\] |
| C. | \[9.2\times {{10}^{5}}\,\,km\] |
| D. | \[9.46\times {{10}^{8}}\,\,km\] |
| E. | None of these |
| Answer» B. \[9.46\times {{10}^{15}}\,\,km\] | |
| 142. |
To which of the following does the 4R principle apply the most? |
| A. | Synthetic fibre |
| B. | Natural fibre |
| C. | Metal |
| D. | Plastic |
| Answer» E. | |
| 143. |
Inverse of frequency is called |
| A. | amplitude |
| B. | frequency |
| C. | loudness |
| D. | time period |
| Answer» E. | |
| 144. |
There are some sounds which cannot be heard by human ear. These sounds have frequency, either more than 20 kHz or less than 20 Hz The sound whose frequency is less than the 20 Hz is called _______. |
| A. | Ultrasonic sound |
| B. | Infrasonic sound |
| C. | Plane sound |
| D. | Sonic boom |
| E. | None of these |
| Answer» C. Plane sound | |
| 145. |
LPG mainly consists of: (i) Propane (ii) Methane (iii) Butane (iv) Ethane |
| A. | (i) and (ii) |
| B. | (ii)and(iii) |
| C. | (i) and (iii) |
| D. | (i)and (iv) |
| E. | None of these |
| Answer» D. (i)and (iv) | |
| 146. |
Which natural calamity cannot be predicted accurately in advance? |
| A. | Flood |
| B. | Cyclone |
| C. | Earthquake |
| D. | Famine |
| Answer» D. Famine | |
| 147. |
Which of the following statements is incorrect about the Earth? |
| A. | The Earth revolves around the Sun in a circular orbit. |
| B. | Rotation of Earth causes day and night. |
| C. | The revolution of the Earth causes seasonal changes on the Earth. |
| D. | Moon is the only natural satellite of Earth. |
| Answer» B. Rotation of Earth causes day and night. | |
| 148. |
_____ protects the buildings from the effects of lightning. |
| A. | Electroscope |
| B. | Seismograph |
| C. | Lightning conductor |
| D. | Lightning insulator |
| E. | None of these |
| Answer» D. Lightning insulator | |
| 149. |
Speed of sound depends on |
| A. | Pressure |
| B. | Direction |
| C. | Frequency |
| D. | Amplitude |
| Answer» C. Frequency | |
| 150. |
A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is 346 m/s. The distance between the dog and the building is |
| A. | 86.5 m |
| B. | 80.6 m |
| C. | 75 m |
| D. | 8.65 m |
| Answer» B. 80.6 m | |