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.
| 1451. |
An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube.When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be |
| A. | Sodium |
| B. | Potassium |
| C. | Iron |
| D. | Calcium. |
| Answer» D. Calcium. | |
| 1452. |
Study the given table carefully and select the appropriate option. Sample Conductor of Electricity Malleability I \[\times \] II \[\times \] III \[\times \] IV |
| A. | I is copper; II is sulphur |
| B. | II is sulphur; III is coal |
| C. | III is iron; IV is copper |
| D. | II is coal; IV is copper |
| Answer» E. | |
| 1453. |
Metals react with hydrogen (no heating) form |
| A. | Hydrides |
| B. | Hydroxide |
| C. | Hydrogen metalloids |
| D. | No reaction |
| Answer» E. | |
| 1454. |
State true or false: (P) Non metals have many different colours. (Q) Nonmetals are less dense and have low melting and boiling points. (R) Non metals are sonorous. |
| A. | (P) (Q) (R) False false true |
| B. | (P) (Q) (R) False true true |
| C. | (P) (Q) (R) True true false |
| D. | (P) (Q) (R) True false true |
| Answer» D. (P) (Q) (R) True false true | |
| 1455. |
Aluminium is good conductor of heat, so it so used in |
| A. | Duralumin |
| B. | Paint |
| C. | Electric wire |
| D. | All the above |
| Answer» C. Electric wire | |
| 1456. |
P: Duralumin is a alloy of Nickel gold Q: Silicon is used in making aeroplane chips R : Amalgam is used for filling cavities in teeth S : Nichrome is an alloy of nickel and chrome |
| A. | (P) (Q) (R) (S) False True True False |
| B. | (P) (Q) (R) (S) True False True False |
| C. | (P) (Q) (R) (S) False True False True |
| D. | (P) (Q) (R) (S) True False False True |
| Answer» B. (P) (Q) (R) (S) True False True False | |
| 1457. |
Fe and Zn are distinguished by |
| A. | HO |
| B. | HCl |
| C. | Alcohol |
| D. | NaOH |
| Answer» E. | |
| 1458. |
Which metal is used as a reducing agent in smelting |
| A. | C |
| B. | Al |
| C. | Zn |
| D. | None |
| Answer» B. Al | |
| 1459. |
Which of the following is a type of polyester? |
| A. | Terylene |
| B. | Terene |
| C. | Dacron |
| D. | All the above |
| Answer» E. | |
| 1460. |
Cords of electrical appliances and cables have a plastic coating because plastics are: |
| A. | Insoluble in water. |
| B. | Poor conductors of electricity. |
| C. | Heavy weight. |
| D. | All the above |
| Answer» C. Heavy weight. | |
| 1461. |
Main source of man-made plastics is: |
| A. | Biogas |
| B. | Crude oil |
| C. | Vegetable fibre |
| D. | All the above |
| Answer» C. Vegetable fibre | |
| 1462. |
When the white light is allowed to pass through the glass prism it under goes dispersion and splits up into its constituent colours. Which colour of the light show minimum refraction? |
| A. | Red |
| B. | Violet |
| C. | Green |
| D. | Blue |
| Answer» B. Violet | |
| 1463. |
A small boy places a paper written 'PAPYRUS' in front of a plane mirror. He finds that it appears totally inverted in opposite direction. He gets confused. He goes to his mother and tells his problem. His mother explains him the exact reason for this. The exact reason could be_______. |
| A. | Reflection |
| B. | Lateral Inversion |
| C. | Diversion |
| D. | Refraction |
| Answer» C. Diversion | |
| 1464. |
What happens in lateral inversion? |
| A. | The right side of the object will be on the right side of the image. |
| B. | The left side of the object will be on the left side of the image. |
| C. | The top of the object will be the bottom of the object. |
| D. | The right side of the object will be on the left side of the image. |
| Answer» E. | |
| 1465. |
While sitting on the first bench, Mutum finds it difficult to read what is written on the blackboard. However, he can clearly see the same when he sits on the last bench. It can be concluded that Mutum is suffering from |
| A. | myopia |
| B. | cataract |
| C. | astigmatism |
| D. | hypermetropia |
| Answer» E. | |
| 1466. |
The focal length of concave mirror is -40 cm. Its radius of curvature is |
| A. | -20 cm |
| B. | +20 cF |
| C. | -80 cm |
| D. | +80 cm |
| Answer» D. +80 cm | |
| 1467. |
Statement I: Real images are always inverted Statement II: Virtual images are always erect |
| A. | Both Statements are true, Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true, Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false, Statement-II is true. |
| Answer» C. Statement-I is true, Statement-II is false. | |
| 1468. |
Statement I: The plane containing the incident ray and the normal is called plane of incidence. Statement II: The plane containing the incident ray and the normal is called plane of reflection. |
| A. | Both Statements are true, Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true. Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» C. Statement-I is true, Statement-II is false. | |
| 1469. |
If a person wants to see an enlarged image of the object by using a convex lens then the lens must be held |
| A. | Close to the object so that the object lies within the focal length of the lens |
| B. | Far from the object so that the object lies beyond 2F |
| C. | At infinity |
| D. | Far from the object so that the object lies at 2F. |
| Answer» B. Far from the object so that the object lies beyond 2F | |
| 1470. |
Which of the following statements are correct regarding the image formed by a concave lens? (i) The nature of image does not change much with the change in the object distance. (ii) Always a virtual image is formed. (iii) The image is larger in size. (iv) Image is never formed between the optical centre and the focus. |
| A. | Only (i), (ii) and (iii) |
| B. | Only (i) and (ii) |
| C. | Only (iii) and (iv) |
| D. | Only (ii), (iii) and (iv) |
| Answer» C. Only (iii) and (iv) | |
| 1471. |
If two plane mirrors are inclined at an angle of \[\text{90 }\!\!{}^\circ\!\!\text{ }\] to each other, how many images of an object are seen? |
| A. | Only 1 |
| B. | Only 2 |
| C. | Only 3 |
| D. | Any of 1, 2, 3 or 4 depending on the position of observer and object. |
| Answer» D. Any of 1, 2, 3 or 4 depending on the position of observer and object. | |
| 1472. |
Ram pushes the box by applying a force of 500 N in horizontal direction so that the box starts sliding-along the floor as shown in figure. Find the point where the frictional force acting on the box is maximum. |
| A. | P |
| B. | Q |
| C. | R |
| D. | P, Q and R |
| Answer» B. Q | |
| 1473. |
Identify the methods of increasing and decreasing friction and choose the correct option. (i) The tyres of vehicles have treads. (ii) Gymnasts often apply a coarse material on their hands. (iii) Saliva in our mouth helps us to swallow food. (iv) A surgeon powders his hand before pulling on his plastic gloves |
| A. | (i) (ii) (iii) (iv) Increasing Decreasing Increasing Decreasing |
| B. | (i) (ii) (iii) (iv) Decreasing Increasing Decreasing Increasing |
| C. | (i) (ii) (iii) (iv) Increasing Increasing Decreasing Decreasing |
| D. | (i) (ii) (iii) (iv) Decreasing Decreasing Increasing Increasing |
| Answer» D. (i) (ii) (iii) (iv) Decreasing Decreasing Increasing Increasing | |
| 1474. |
In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open tightly closed lid of a bottle(d) Pulling drawer out of a desk |
| A. | (a)(b)(c)(d)TTHH |
| B. | (a)(b)(c)(d)HHTT |
| C. | (a)(b)(c)(d)TTTH |
| D. | (a)(b)(c)(d)HHHT |
| Answer» E. | |
| 1475. |
In which one of the following case, the pressure exerted will be maximum? |
| A. | Baloon |
| B. | Water in Bucket |
| C. | Statue |
| D. | Bread |
| Answer» B. Water in Bucket | |
| 1476. |
Which of the following statements are true? (i) An object will continue moving uniformly until the resultant force on it is zero. (ii) The bodies do not change their state of rest or motion unless acted upon by an unbalanced external force. (iii) If a body is at rest on the surface of the Earth then the net downward force exerted by the Earth and net upward force exerted on the body are not equal to each other. |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | All (i), (ii) and (iii) |
| Answer» B. Only (ii) and (iii) | |
| 1477. |
Which of the following options explain the term eutrophication? |
| A. | Toxication of water by fertilizers |
| B. | Decrease the growth of algae |
| C. | Increase in the fertility of the soil |
| D. | All of the above. |
| Answer» B. Decrease the growth of algae | |
| 1478. |
Match the following crops with the types: Sr. No. Type of Crop Example of Crops 1. Cereals A. Garlic 2. Pulse B. Groundnut 3. Oil seeds C. Peas 4. Fibers D. Millets |
| A. | 1-D, 2-C, 3-B, 4-A |
| B. | 1-B, 2-C, 3-D, 4-A |
| C. | 1-C, 2-D, 3-A, 4-B |
| D. | 1-A, 2-C, 3-D, 4-B |
| Answer» B. 1-B, 2-C, 3-D, 4-A | |
| 1479. |
The graphic given below depicts which element of biological organization? |
| A. | Biosphere |
| B. | Ecosystem |
| C. | Community |
| D. | Population |
| Answer» C. Community | |
| 1480. |
Which one of the following is not correct about wildlife sanctuary? |
| A. | A wildlife sanctuary occupies a comparatively smaller area of land |
| B. | Local peoples form an integral part of a wildlife sanctuary |
| C. | A wildlife sanctuary is mainly for the protection of wild animals of the area in their natural habitat |
| D. | All of these |
| Answer» C. A wildlife sanctuary is mainly for the protection of wild animals of the area in their natural habitat | |
| 1481. |
Which one of the following statements is correct? Statement 1: Deforestation is one of the biggest threat to the existence of wild life Statement 2: Deforestation will disturb the balance in ecosystem |
| A. | Statement 1 |
| B. | Statement 2 |
| C. | Both statements are correct |
| D. | Both statements are incorrect |
| Answer» D. Both statements are incorrect | |
| 1482. |
How many zones a flame consists of: |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 1483. |
Which one of the following is non-combustible substance? |
| A. | LPG |
| B. | CNG |
| C. | Sand |
| D. | Charcoal |
| Answer» D. Charcoal | |
| 1484. |
The calorific value of a fuel is 330000 kJ/kg. 0.9634 kg of the fuel is taken for combustion. The total amount of heat energy (in kJ) produced during combustion is |
| A. | 317922 |
| B. | 215677 |
| C. | 3179.22 |
| D. | 317.922 |
| Answer» B. 215677 | |
| 1485. |
Which one of the following is obtained by the refining of petroleum? |
| A. | Petrol |
| B. | Kerosene |
| C. | Diesel |
| D. | All of these |
| Answer» E. | |
| 1486. |
Which one of the following is correct about the coal? |
| A. | Coal is a fossil fuel |
| B. | Coal was formed from the remains of plants |
| C. | Coal is used to generate electricity |
| D. | All of these |
| Answer» E. | |
| 1487. |
Which one of the following statements is correct? Statement 1: The liquid that conduct electricity is solution of acids, bases/ salts and water Statement 2: When electric current passes through an electrolyte, chemical changes takes place |
| A. | Statement 1 |
| B. | Statement 2 |
| C. | Both statements are correct |
| D. | Both statements are incorrect |
| Answer» D. Both statements are incorrect | |
| 1488. |
Which one of the following is an insulator of electricity? |
| A. | Copper |
| B. | Iron |
| C. | Mercury |
| D. | Air |
| Answer» E. | |
| 1489. |
Which one of the following statements is correct? Statement 1: The positively charged electrode is called anode. Statement 2: The negatively charged electrode is called cathode. |
| A. | Statement 1 |
| B. | Statement 2 |
| C. | Both statements are correct |
| D. | Both statements are incorrect |
| Answer» D. Both statements are incorrect | |