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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.
| 1601. |
What is the mode by which heat is transferred in solid substances? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Insulation |
| Answer» B. Convection | |
| 1602. |
Cups are not made of metals. The reason is |
| A. | metals are good conductors |
| B. | metals are bad conductors |
| C. | metals are expensive |
| D. | None of the above |
| Answer» B. metals are bad conductors | |
| 1603. |
Which of the following is a good conductor of heat? |
| A. | Plastic |
| B. | Water |
| C. | Glass |
| D. | Copper |
| Answer» E. | |
| 1604. |
Conduction is possible |
| A. | when the bodies are apart from each other |
| B. | when the bodies have same temperature and in thermal contact |
| C. | when they have different temperatures maintaining distance between them |
| D. | bodies should be in contact and should have different temperatures |
| Answer» E. | |
| 1605. |
Which of these phenomena is caused due to convection? |
| A. | Ventilation |
| B. | Trade winds |
| C. | Ocean currents |
| D. | All of the above |
| Answer» E. | |
| 1606. |
Which of the following devices is used for measurement of temperature of human body? |
| A. | Stethoscope |
| B. | Clinical thermometer |
| C. | Laboratory thermometer |
| D. | None of these |
| Answer» C. Laboratory thermometer | |
| 1607. |
Direction: Read the given experiment and answer the following questions.Paper pins are stuck to a metal rod with wax and a lighted candle is kept below the rod as shown in the diagram below. What does this experiment illustrate? |
| A. | Wax melts easily. |
| B. | The candle flame conducts heat. |
| C. | The thumbtacks expand when heated. |
| D. | Heat gets transferred from hot part of a body to cold part. |
| Answer» E. | |
| 1608. |
When you heat water in a pot, it boils. What can you infer from the above observation? |
| A. | Heat is a form of energy. |
| B. | Water can boil by itself. |
| C. | Water develops heat on its own. |
| D. | Water is a universal solvent. |
| Answer» B. Water can boil by itself. | |
| 1609. |
We receive heat energy from the sun through ______ mode of transmission |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | yet to be found |
| Answer» D. yet to be found | |
| 1610. |
In an experiment shown in figure, the water near the top of the tube starts boiling but the wax in the test tube does not melt completely. What do you conclude? |
| A. | Convection cannot occur in water. |
| B. | Water is a poor conductor of heat. |
| C. | Wax is a bad radiator of heat. |
| D. | Heat is not reaching at the bottom of the test tube as tube is made of insulator. |
| Answer» C. Wax is a bad radiator of heat. | |
| 1611. |
Windows having double glass panes with some space between them is called double glazing. Why do windows in cold countries have double glazing? |
| A. | For the conduction of heat |
| B. | For the insulation of heat |
| C. | For the radiation of heat |
| D. | All of the above |
| Answer» C. For the radiation of heat | |
| 1612. |
When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at higher temperature to the body at lower temperature until them both acquire the same temperature. Assuming that there is no loss of heat to the surroundings, the heat |
| A. | gained by the hotter body will be equal to the heat lost by the colder body |
| B. | the heat gained by the hotter body will be less than the heat lost by the colder body |
| C. | the heat gained by the hotter body will be greater than the heat lost by the colder body |
| D. | the heat lost by the hotter body will be equal to the heat gained by the colder body. |
| Answer» E. | |
| 1613. |
When you put a metal key into its metal lock, you find the key is too tight. Which of the following methods will you adopt to make the key fit properly? |
| A. | Heating the key and lock both |
| B. | Cooling the key and heating the lock |
| C. | Heating the key and cooling the lock |
| D. | Cooling the key and lock both |
| Answer» C. Heating the key and cooling the lock | |
| 1614. |
In cold countries, why are steam pipes covered with asbestos or glass wool? |
| A. | To prevent bursting due to expansion |
| B. | To prevent heat loss due to conduction |
| C. | To prevent radiation |
| D. | All of the above |
| Answer» C. To prevent radiation | |
| 1615. |
Process of change of state from gaseous state to liquid state is called |
| A. | freezing |
| B. | sublimation |
| C. | boiling |
| D. | condensation |
| Answer» E. | |
| 1616. |
By which mode of transmission of heat does air get heated up? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Diffusion |
| Answer» C. Radiation | |
| 1617. |
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why? |
| A. | On heating glass expands and lid contracts |
| B. | Lid expands more than the neck and thus slides easily |
| C. | Neck becomes slippery on heating |
| D. | Lids of the bottles cannot bear the heat |
| Answer» C. Neck becomes slippery on heating | |
| 1618. |
Two steel balls P and Q have same readings when measured by thermometers of Celsius readings and Fahrenheit readings respectively. Then, |
| A. | Ball P has greater temperature than ball Q |
| B. | Ball P has lower temperature than ball Q |
| C. | Both the balls P and Q have same temperature |
| D. | None of these |
| Answer» D. None of these | |
| 1619. |
X is the mode of transmission of heat that takes place by the movement of hot particles. Identify X. |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Expansion |
| Answer» C. Radiation | |
| 1620. |
Expansion of a substance on heating depends on |
| A. | nature of the substance |
| B. | rise in temperature |
| C. | both A and B |
| D. | color of the substance |
| Answer» D. color of the substance | |
| 1621. |
A hot liquid is carefully poured into a beaker. The graph shows how its temperature changes as it cools towards room temperature.Which process (es) is/are taking place at region X? |
| A. | Boiling and evaporation |
| B. | Condensation only |
| C. | Evaporation only |
| D. | Solidification and evaporation |
| Answer» E. | |
| 1622. |
Identify the normal human body temperature. |
| A. | \[32{{\,}^{o}}F\] |
| B. | \[212{{\,}^{o}}F\] |
| C. | \[100.4{{\,}^{o}}F\] |
| D. | \[~98.4{{\,}^{o}}F\] |
| Answer» E. | |
| 1623. |
Two glass test tubes are heated in two different directions. In which test tube will all the water heat up first? |
| A. | In X only |
| B. | In Y only |
| C. | In both X and Y |
| D. | In neither X nor Y |
| Answer» B. In Y only | |
| 1624. |
What is the range of a clinical thermometer? |
| A. | \[0-100{{\,}^{o}}C\] |
| B. | \[32-214{{\,}^{o}}F\] |
| C. | \[0-273\text{ }{{\,}^{o}}C\] |
| D. | \[35-42\text{ }{{\,}^{o}}C\] |
| Answer» E. | |
| 1625. |
Seema is in a hurry and wants her noodles to cool down faster. She should put it on a plate made of |
| A. | wood |
| B. | paper |
| C. | plastic |
| D. | metal |
| Answer» E. | |
| 1626. |
Which of the following statements is incorrect? |
| A. | Thermometer is read by holding its bulb. |
| B. | A few sharp jerks are given to clinical thermometer before using it. |
| C. | The black fabric tent is preferred during winter. |
| D. | Shopkeepers selling ice blocks usually cover them with jute sacks. |
| Answer» B. A few sharp jerks are given to clinical thermometer before using it. | |
| 1627. |
Nights are cooler in the deserts because |
| A. | sand radiates heat less quickly as compared to earth |
| B. | the sky is generally clear |
| C. | sand radiates heat more quickly as compared to earth |
| D. | the sky is generally cloudy. |
| Answer» D. the sky is generally cloudy. | |
| 1628. |
How many parts does a Celsius scale have? |
| A. | 100 |
| B. | 273 |
| C. | 180 |
| D. | 50 |
| Answer» B. 273 | |
| 1629. |
A saucepan is usually made up of two different materials, P and 0. Identify P and Q. |
| A. | P-Steel, Q-Aluminium |
| B. | P-Ebonite, Q-Plastic |
| C. | P-Steel, Q-Ebonite |
| D. | P-Wood, Q-Ebonite |
| Answer» D. P-Wood, Q-Ebonite | |
| 1630. |
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Four beakers given below contain same liquid. Which of the following beakers contain the more amount of heat energy? (A) (B) (C) (D) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 1631. |
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: The figure shows air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb is placed midway between the painted air filled bulbs and electric bulb is lighted? |
| A. | The level of alcohol falls in both limbs. |
| B. | The level of alcohol in the limb X rises while that in limb Y falls. |
| C. | The level of alcohol in limb X falls while that in limb Y rises. |
| D. | There is no change in the levels of alcohol in the two limbs. |
| Answer» D. There is no change in the levels of alcohol in the two limbs. | |
| 1632. |
DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: The bulb of one thermometer is spherical while that of the other is cylindrical. Both have equal amount of mercury. The response of the cylindrical bulb thermometer will be quicker. Statement-2: Heat conduction in a body is directly proportional to cross-sectional area. Statement-3: The range of clinical thermometer is \[35{}^\circ C\] to \[42{}^\circ C\] |
| A. | Statement (1) and (3) are incorrect while statement (2) is correct. |
| B. | Statement (1) and (2) are incorrect while (3) is correct. |
| C. | All the statements are correct. |
| D. | All the statements are incorrect. |
| Answer» D. All the statements are incorrect. | |
| 1633. |
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Consider the figures of a metal ball and a metal ring given below: The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal ring is heated. |
| A. | The ball will not pass through because there is no change in the ring. |
| B. | The ball can now pass through it because the ring diameter expands on heating. |
| C. | The ball gets stuck because the diameter of the hole decreases on expansion. |
| D. | None of the above |
| Answer» C. The ball gets stuck because the diameter of the hole decreases on expansion. | |
| 1634. |
DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: Room heaters and refrigerators lose most of their heat by convection. Statement-2: A hot surface heat the air next to it. The hot air rises, to be replaced by cooler air which then heat, and so on. Statement-3: Radiation is a method of transfer of heat. |
| A. | Statement (1) and (3) are incorrect while statement (2) is correct. |
| B. | Statement (1) and (2) are incorrect while (3) is correct. |
| C. | All the statements are correct. |
| D. | All the statements are incorrect. |
| Answer» D. All the statements are incorrect. | |
| 1635. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Snow is better insulator than ice. Reason (R): Snow contain air packet and air is good insulator of heat. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 1636. |
Mercury is generally used in thermometer because it has a |
| A. | high fluidity |
| B. | high density |
| C. | high conductivity |
| D. | high specific heat |
| Answer» D. high specific heat | |
| 1637. |
Which of the following statement(s) is/are in correct? (i) Two thin woollen sweaters are warmer than a thick woollen sweater. (ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides. (iii) The cable wires between two poles are left loose because in summers, the wires do not break on expanding. |
| A. | Only (i) and (iii) |
| B. | Only (ii) and (iii) |
| C. | Only (iii) |
| D. | Only (i) |
| Answer» D. Only (i) | |
| 1638. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Two bodies at different temperatures, if brought in thermal contact do not necessary settle to the mean temperature. Reason (R): The two bodies may have different thermal capacities. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 1639. |
Why is it hotter over the top of a fire than at the same distance on the sides? |
| A. | Due to convection of heat |
| B. | Due to conduction of heat |
| C. | Due to radiation of heat |
| D. | Due to conduction, convection and radiation of heat |
| Answer» B. Due to conduction of heat | |
| 1640. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): A brass tumbler feels much colder than a wooden tray on a chilly day. Reason (R): The ability to conduct heat of brass is less than that of wood. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» D. A is false but R is true. | |
| 1641. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Land and sea breezes are caused in coastal regions. Reason (R): The specific heat of land is about 4 times less than sea water. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 1642. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The temperature of a body is\[10{}^\circ C\]. Its temperature in Fahrenheit scale is\[50{}^\circ F\]. Reason (R): Celsius (C) and Fahrenheit (F) are related as \[F=\frac{9}{5}C+32\] |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 1643. |
DIRECTIONS: Read the passage given below an answer the questions that follow. Passage ? 2 The thermometers showed the temperature of the water in cup A and cup B at the beginning of a heat-flow experiment. Over the next 15 minutes, which changes would most likely occur? |
| A. | The temperature in cup A will decrease and the temperature in cup B will increase. |
| B. | The temperature in cup A will decrease and the temperature in cup B will decrease. |
| C. | The temperature in cup A will increase and the temperature in cup B will increase. |
| D. | The temperature in cup A will increase and the temperature in cup B will decrease. |
| Answer» B. The temperature in cup A will decrease and the temperature in cup B will decrease. | |
| 1644. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Temperature decreases with increasing height above sea level. Reason (R): Atmosphere is mainly heated by conduction from the earth. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 1645. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Glass tumbler breaks in winter when hot water is poured to it. Reason (R): When hot water is poured, the outer surface of glass expands. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» D. A is false but R is true. | |
| 1646. |
DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. When we touch a steel rod and a paper simultaneously, we feel that the rod is colder because: |
| A. | Iron being a good conductor conducts more heat from our body |
| B. | Paper being a good conductor conducts more heat from our body |
| C. | More heat flows from the iron to our body |
| D. | More heat flows from the paper to our body |
| Answer» B. Paper being a good conductor conducts more heat from our body | |
| 1647. |
DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. Which of the following is the best insulator of heat? |
| A. | air |
| B. | silver |
| C. | iron |
| D. | water |
| Answer» B. silver | |
| 1648. |
In land breeze |
| A. | cold air moves from sea towards land during night. |
| B. | hot air moves from sea towards land during night. |
| C. | cold air moves from land towards sea during night. |
| D. | None of the above is correct |
| Answer» D. None of the above is correct | |
| 1649. |
A thermo flask is a household item that is used to keep things warm or cold support for a long time. What is the use of silvered wall in thermo flask? |
| A. | To reduce the flow of heat by conduction. |
| B. | To increase the temperature by convection. |
| C. | To reflect the heat back to reduce radiation, |
| D. | To prevent the glass vessel from breaking. |
| Answer» D. To prevent the glass vessel from breaking. | |
| 1650. |
Why is mercury widely used in clinical thermometers? (i) Mercury is easily available in pure form. (ii) Mercury is opaque. (iii) Mercury has a constant coefficient of expansion. |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |