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MCQOPTIONS
This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.
| 2501. |
Reducing agent is that which: |
| A. | Can oxidizes other substances. |
| B. | Can reduce other substances by removing oxygen. |
| C. | Can oxidizes other substances by removing hydrogen. |
| D. | Can oxidizes other substances by providing oxygen to them. |
| Answer» C. Can oxidizes other substances by removing hydrogen. | |
| 2502. |
Which of the following chemical reactions is endothermic? |
| A. | \[{{N}_{2}}+{{O}_{2}}\to 2NO\] |
| B. | \[C+2S\to C{{S}_{2}}\] |
| C. | \[C+{{O}_{2}}\to C{{O}_{2}}\] |
| D. | Both [a] and [b] |
| Answer» D. Both [a] and [b] | |
| 2503. |
Effervescence is: |
| A. | Burning of paper |
| B. | Melting of ice |
| C. | Bubbling in liquid |
| D. | Freezing of water |
| Answer» D. Freezing of water | |
| 2504. |
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 1 Take a small quantity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3-5 medium sized iron nails in it. Soon the colour of blue solution changes to green and a brown deposit appears on the iron nails. Change of colour from blue to green in the above activity represents: |
| A. | physical change |
| B. | chemical change |
| C. | Both of the above |
| D. | None of these |
| Answer» C. Both of the above | |
| 2505. |
What change takes place when a boy kicks a football? |
| A. | Exothermic reaction |
| B. | Endothermic reaction |
| C. | Physical change |
| D. | Chemical change |
| Answer» D. Chemical change | |
| 2506. |
A chemical reaction showing single displacement reaction is: |
| A. | \[NaCl+AgN{{O}_{3}}\to AgCl+NaN{{O}_{3}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}+2NaOH\to N{{a}_{2}}S{{O}_{4}}+2{{H}_{2}}O\] |
| C. | \[AgN{{O}_{3}}+Cu\to Cu{{(N{{O}_{3}})}_{2}}+2Ag\] |
| D. | All the above |
| Answer» D. All the above | |
| 2507. |
Washing soda is: |
| A. | Calcium carbonate |
| B. | Calcium sulphate |
| C. | Sodium carbonate |
| D. | Sodium hydrogen carbonate |
| Answer» D. Sodium hydrogen carbonate | |
| 2508. |
____ is produced when anaerobic bacteria digest animal waste. |
| A. | Hydrogen gas |
| B. | Biogas |
| C. | Nitrogen gas |
| D. | Sulphur dioxide gas |
| Answer» C. Nitrogen gas | |
| 2509. |
Which of the following is not a chemical change? |
| A. | Digestion of food |
| B. | Conversion of liquified petroleum gas into gas on opening the cylinder. |
| C. | Photosynthesis |
| D. | Production of biogas from animal waste |
| Answer» C. Photosynthesis | |
| 2510. |
Which of the following changes caused by heating a substance is irreversible? |
| A. | Change in size |
| B. | Change in state |
| C. | Change in colour |
| D. | Change in substance |
| Answer» E. | |
| 2511. |
When an iron bar of length 12 cm is magnetized, its length was found to have increased. What happens to its mass? |
| A. | It increases. |
| B. | It decreases. |
| C. | It remains the same. |
| D. | It cannot be explained. |
| Answer» D. It cannot be explained. | |
| 2512. |
An oxide of iron from the following is |
| A. | mud |
| B. | dust |
| C. | rust |
| D. | None of these |
| Answer» D. None of these | |
| 2513. |
Name the insoluble product formed when two compounds react in their aqueous solution state. |
| A. | Reactant |
| B. | Precipitate |
| C. | Catalyst |
| D. | Water |
| Answer» C. Catalyst | |
| 2514. |
Burning of candle is a: |
| A. | Physical Change |
| B. | Chemical Change |
| C. | Both [a] and [b] |
| D. | Biological Change |
| Answer» D. Biological Change | |
| 2515. |
Gas evolving when acetic acid gets reacted with baking soda. |
| A. | Hydrogen |
| B. | Carbon dioxide |
| C. | Nitrogen |
| D. | Argon |
| Answer» C. Nitrogen | |
| 2516. |
Read the given statements and select the correct option. Statement 1: Many cut fruits, when kept in open turn brown. Statement 2: Browning of fruits is due to a chemical reaction. |
| 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. | |
| 2517. |
Which of the following changes does sugar undergo when it is dissolved in water to form sugar solution? |
| A. | Chemical change |
| B. | Physical change |
| C. | Neutralization reaction |
| D. | Irreversible change |
| Answer» C. Neutralization reaction | |
| 2518. |
The process used to prevent rusting of iron, in which a thin coat of zinc is provided over iron surface. This process is: |
| A. | galvanization |
| B. | electroplating |
| C. | painting in zinc |
| D. | None of these |
| Answer» B. electroplating | |
| 2519. |
Convert \[-150{}^\circ \] Celsius to Kelvin. |
| A. | 123 K |
| B. | 273 K |
| C. | 274 K |
| D. | 373 K |
| Answer» B. 273 K | |
| 2520. |
Some utensils of stainless steel are provided with copper bottoms because: |
| A. | Copper is easy to clean. |
| B. | It looks good. |
| C. | Copper is a better conductor of heat than stainless steel. |
| D. | All the above |
| Answer» D. All the above | |
| 2521. |
Molecules of matter on heating: |
| A. | Move slower |
| B. | Stand still |
| C. | Move faster |
| D. | Always get broken |
| Answer» D. Always get broken | |
| 2522. |
Hydrochloric acid is added to a beaker containing a piece of zinc. Zinc chloride is formed and hydrogen gas is released. This is an example of: |
| A. | a chemical reaction |
| B. | a physical change |
| C. | Crystallization |
| D. | None of these |
| Answer» B. a physical change | |
| 2523. |
The diagram below shows the formation of two water molecules How many atoms combined to form the two water molecules? |
| A. | Total 6, two oxygen and four hydrogen atoms |
| B. | Total 6, two hydrogen and four oxygen atoms |
| C. | Total 6, three oxygen and three hydrogen atoms |
| D. | Total 10, six hydrogen and four oxygen Atoms |
| Answer» B. Total 6, two hydrogen and four oxygen atoms | |
| 2524. |
Kirti kept a metal spoon in a glass jar filled with pickle for a few days. She observed that there were holes in the spoon. What could be the possible reason for this? |
| A. | Oil present in pickle dissolves the metal. |
| B. | Oil present in pickle liberates a gas in which metal gets dissolved. |
| C. | Metal reacts with acid present in pickle to form salt hence, metal gets dissolved. |
| D. | The glass reacts with metal to give acid which dissolves the metal. |
| Answer» D. The glass reacts with metal to give acid which dissolves the metal. | |
| 2525. |
Match the entries in Column-l with those in Column-ll. Column I Column II (a) Burning of wood 1 Physical change (b) Formation of day and night 2 Slow change (c) Curdling of milk 3 Periodic change (d) Melting of ice 4 Chemical change |
| A. | a-2, b-3, c-4, d-1 |
| B. | a-4, b-3, c-2, d-1 |
| C. | a-4, b-3, c-1, d-2 |
| D. | a-3, b-4, c-2, d-1 |
| Answer» C. a-4, b-3, c-1, d-2 | |
| 2526. |
A ____ has a very strong stem. |
| A. | Bush |
| B. | Tree |
| C. | Creeper |
| D. | Climber |
| Answer» C. Creeper | |
| 2527. |
Which of the following helps in maintaining the supply of nutrients to the plants? |
| A. | Frog |
| B. | Grasshopper |
| C. | Fungi |
| D. | Mosquito |
| Answer» D. Mosquito | |
| 2528. |
Starting from the top to bottom which one of the following sequence of layers of forest is correct? |
| A. | Understorey, Shrub layer, Forest floor, Herb layer, Canopy |
| B. | Canopy, Understorey, Shrub layer, Herb layer, Forest floor |
| C. | Canopy, Understorey, Herb layer, Shrub layer. Forest floor |
| D. | Shrub layer, Herb layer, Forest floor, Understorey, Canopy |
| Answer» C. Canopy, Understorey, Herb layer, Shrub layer. Forest floor | |
| 2529. |
The soil which is obtained from basaltic rock is: |
| A. | Desert soil |
| B. | Red soil |
| C. | Alluvial soil |
| D. | Black soil |
| Answer» E. | |
| 2530. |
Which of the following contains largest sized rock particles? |
| A. | Silt |
| B. | Gravel |
| C. | Clay |
| D. | Sand |
| Answer» C. Clay | |
| 2531. |
Highest water holding capacity is of: |
| A. | Sandy soil |
| B. | Loamy soil |
| C. | Clayey soil |
| D. | Gravel soil |
| Answer» D. Gravel soil | |
| 2532. |
Which of the following statements is correct? (i) Loamy soil contains sufficient amount of humus. (ii) Clayey soil contains good quantity of sand and silt. (iii) Sandy soil cannot hold much water in it. (iv) Size of Clay particles is bigger than those of silt particles. |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 2533. |
It is difficult to dig deeper into the soil because: |
| A. | Plants are there. |
| B. | Microorganisms are present there. |
| C. | Partially weathered rocks or bed rock are present there. |
| D. | All the above |
| Answer» D. All the above | |
| 2534. |
Match the following: Column A Column B (i) A- horizon [A] Subsoil (ii) B- horizon [B] Hard rock (iii) C- horizon [C] Substratum (iv) D- horizon [D] Rich humus |
| A. | (i-D), (ii-B), (iii-A), (iv-C) |
| B. | (i-D), (ii-A), (iii-C), (iv-B) |
| C. | (i-D), (ii-B), (iii-C), (iv-A) |
| D. | (i-B), (ii-D), (iii-A), (iv-C) |
| Answer» C. (i-D), (ii-B), (iii-C), (iv-A) | |
| 2535. |
Which of the following is a liquid waste? |
| A. | Sludge |
| B. | Sewage |
| C. | Rags |
| D. | All the above |
| Answer» C. Rags | |
| 2536. |
Rigid outer part of earth consisting of crust and upper mantle is: |
| A. | Exosphere |
| B. | Lithosphere |
| C. | Hydrosphere |
| D. | Atmosphere |
| Answer» C. Hydrosphere | |
| 2537. |
Portable toilets are ____ toilets. |
| A. | Septic tank |
| B. | Composting |
| C. | Chemical |
| D. | Vermi-processing |
| Answer» D. Vermi-processing | |
| 2538. |
Which of the following characteristics belongs to the B-Horizon? (i) It is also known as sub-soil. (ii) It has very little humus. (iii) It consists of bed rocks. (iv) It is rich in soluble minerals. |
| A. | (i) and (ii) |
| B. | (i), (ii) and (iv) |
| C. | (ii), (iii) and (iv) |
| D. | (i), (iii) and (iv) |
| Answer» C. (ii), (iii) and (iv) | |
| 2539. |
Provision of drainage at a place by laying sewers under the ground is: |
| A. | Sewage |
| B. | Contaminants |
| C. | Sewerage |
| D. | Decomposition |
| Answer» D. Decomposition | |
| 2540. |
Which of the following is not responsible for destruction of forests? |
| A. | Deforestation |
| B. | Afforestation |
| C. | Fire |
| D. | Overgrazing |
| Answer» C. Fire | |
| 2541. |
Herbs form the ____ layer of vegetation in the forest. |
| A. | Lowest |
| B. | Highest |
| C. | Middle |
| D. | All the above |
| Answer» B. Highest | |
| 2542. |
A major component of soil, dark brown in colour and consists of decaying remains of plants and animals. |
| A. | Mineral particles |
| B. | Silt |
| C. | Humus |
| D. | Sand |
| Answer» D. Sand | |
| 2543. |
Plants obtain their nutrition from soil and make sugar for themselves. Which part of plants receives carbon dioxide from atmosphere? |
| A. | Roots part |
| B. | Flowers part |
| C. | Leaves part |
| D. | All of these |
| Answer» D. All of these | |
| 2544. |
The given figures show different types of teeth. Which of these is used for biting and cutting of food? |
| A. | X |
| B. | W |
| C. | Both W and Y |
| D. | Both Y and Z |
| Answer» B. W | |
| 2545. |
The given list shows the five steps needed to do a starch test but in a random order. (i) Pluck a leaf from the plant. (ii) Leave a potted plant out in the Sun for a few hours. (iii) Boil the leaf in alcohol. (iv) Put the leaf in boiling water for 2 minutes. (v) Wash the leaf and then add a few drops of iodine solution over it. Select the option with correct order of these steps. |
| A. | (i), (ii), (iii), (iv), (v) |
| B. | (i), (ii), (iv), (iii), (v) |
| C. | (ii), (i), (v), (iv), (iii) |
| D. | (ii), (i), (iv), (iii), (v) |
| Answer» E. | |
| 2546. |
Most crops require a lot of nitrogen to synthesise the proteins. The bacterium Rhizobium helps some of the crops to get nitrogen. Which of the following statements is incorrect for Rhizobium? |
| A. | It converts atmospheric nitrogen into a soluble form that the plants can absorb from soil. |
| B. | It can make its own food. |
| C. | (c) It lives in the root nodules of leguminous plants like gram, pea, moong etc. |
| D. | (d) Leguminous plants provide food and shelter to Rhizobium. |
| Answer» C. (c) It lives in the root nodules of leguminous plants like gram, pea, moong etc. | |
| 2547. |
Choose the correct option for the given diagram. |
| A. | a-cell membrane, b-cell wall, c- nucleus, d-vacuole, e-mitochondria |
| B. | a-cell wall, b-cell membrane, c- vacuole, d-nucleus, e-mitochondria |
| C. | a-cell wall, b-cell membrane, c- nucleus, d-vacuole, e-mitochondria |
| D. | a-cell membrane, b-vacuole, c- nucleus, d-mitochondria, e-cell wall |
| Answer» C. a-cell wall, b-cell membrane, c- nucleus, d-vacuole, e-mitochondria | |
| 2548. |
Which of the following is not a leguminous plant? |
| A. | Grams |
| B. | Peas |
| C. | Pulses |
| D. | Mango |
| Answer» E. | |
| 2549. |
Match the following: Column A Column B (i) Sundew [A] Saprophyte (ii) Dodder [B] Autotroph (iii) Mushroom [C] Insectivorous (iv) Mimosa [D] Parasite |
| A. | (i-C), (ii-D), (iii-B), (iv-A) |
| B. | (i-D), (ii-C), (iii-A), (iv-B) |
| C. | (i-C), (ii-D), (iii-A), (iv-B) |
| D. | (i-B), (ii-A), (iii-D), (iv-C) |
| Answer» D. (i-B), (ii-A), (iii-D), (iv-C) | |
| 2550. |
Which of the following is not a ruminant? |
| A. | Goat |
| B. | Elephant |
| C. | Buffalo |
| D. | Cow |
| Answer» C. Buffalo | |