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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.
| 1551. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement 1: In a room containing air, heat can go from one place to another by radiation only. Statement 2: In conduction & convection, heat is transferred from one place to other by actual motion of heated material. |
| A. | Statement (1) is correct while statement (2) is incorrect. |
| B. | Statement (2) is correct while statement (1) is incorrect. |
| C. | Both statements are correct |
| D. | Both statements are incorrect. |
| Answer» C. Both statements are correct | |
| 1552. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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 clinical thermometer has a scale in the range of \[37{}^\circ C\] to\[45{}^\circ C\]. Reason (R): The normal temperature of human body is\[37{}^\circ C\]. |
| 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» E. | |
| 1553. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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 is a measure of degree of hotness of our body. Reason (R): We use a clinical thermometer to measure the degree of hotness of our body. |
| 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» C. A is true but R is false. | |
| 1554. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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 flow of heat energy from one body to the other depends upon the amount of heat energy in them. Reason (R): Heat flows from lower temperature of the body to higher temperature of the body. |
| 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. | |
| 1555. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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 the same temperature may contain different amounts of heat. Reason (R): Two bodies may require different amounts of heat to maintain or acquire same temperature. |
| 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» E. | |
| 1556. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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): Sea breeze blows during daytime. Reason (R): The air above the sea is hot and moves toward land. |
| 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. | |
| 1557. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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): When a body A at temperature \[50{}^\circ C\] is brought in contact with a body B at temperature \[30{}^\circ C,\] heat flows from the body 4 to the body B. Reason (R): Heat always flows from a body at a low temperature to a body at a high temperature. |
| 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. | |
| 1558. |
The flow of heat by conduction is generally observed in case of |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | All of these |
| Answer» B. liquids | |
| 1559. |
A pot full of water is put to boil on the stove. Which one of the graphs below shows the correct change in temperature over time? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 1560. |
For the effective radiation of heat by an electric room heater, which of the following needs to be done? |
| A. | Keep it clean. |
| B. | Polish it to shine. |
| C. | Paint it green. |
| D. | Paint it black. |
| Answer» C. Paint it green. | |
| 1561. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled 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): Heat always flows from a larger object to a smaller object. Reason (R): Various modes by which heat can flow are conduction, convection and radiation. |
| 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» E. | |
| 1562. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? In this activity the mode of transference of heat is |
| A. | Conduction |
| B. | convection |
| C. | Radiation |
| D. | none of these |
| Answer» C. Radiation | |
| 1563. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. Which of the following precautions should be used while using a clinical thermometer? |
| A. | It should be washed before use. |
| B. | It should be washed after use. |
| C. | It should be washed preferably with some antiseptic. |
| D. | All the above. |
| Answer» E. | |
| 1564. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? Which hand feels hot? |
| A. | The hand that was kept above the flame. |
| B. | The hand that was kept on the side of the flame. |
| C. | Both hands feel equally hot. |
| D. | None of these is correct. |
| Answer» B. The hand that was kept on the side of the flame. | |
| 1565. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. What for is a clinical thermometer provided with a kink? |
| A. | To keep the mercury within the range of \[35{}^\circ C\]-\[42{}^\circ C\] |
| B. | To allow the temperature reading to remain unchanged after the use of temperature until a jerk is given. |
| C. | To make the thermometer size smaller. |
| D. | All of the above are correct. |
| Answer» C. To make the thermometer size smaller. | |
| 1566. |
DIRECTION: Match Column-I with Column-II and select the correct answer using the code given below the columns. Column - I Column - II (A) Clinical thermo-meter (p) Kink (B) Laboratory thermometer (q) Scale marked in \[{}^\circ C\] (C) Steel (r) Good conductor (D) Plastic (s) Bad conductor |
| A. | A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) |
| B. | A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) |
| C. | A\[\to \] (q), B\[\to \] (p), C\[\to \] (s), D\[\to \] (r) |
| D. | A\[\to \] (p), B\[\to \] (q), C\[\to \] (s), D\[\to \] (r) |
| Answer» B. A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) | |
| 1567. |
DIRECTION: Match Column-I with Column-II and select the correct answer using the code given below the columns. Column - I (Transfer of heat) Column - II (Medium) (A) Conduction (p) Black surface (B) Convection (q) Vacuum (C) Radiation (r) Air (D) Absorption (s) A solid medium |
| A. | A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) |
| B. | A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) |
| C. | A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) |
| D. | A\[\to \] (s), B\[\to \] (p), C\[\to \] (r), D\[\to \] (q) |
| Answer» D. A\[\to \] (s), B\[\to \] (p), C\[\to \] (r), D\[\to \] (q) | |
| 1568. |
DIRECTION: Match Column-I with Column-II and select the correct answer using the code given below the columns. Column-I Column-II (A) Summer (p) Land breeze blows (B) Winter (q) Sea breeze blows (C) Day (r) Dark colored clothes are preferred (D) Night (s) Light colored clothes are preferred |
| A. | A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) |
| B. | A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) |
| C. | A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) |
| D. | A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) |
| Answer» B. A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) | |
| 1569. |
The base of a cooking vessel is usually black and dull. Why is it made this way? |
| A. | Black is a favorite color of most of the consumers. |
| B. | Dull surface prevent slipping of vessels. |
| C. | Black and dull surfaces are good absorbers of heat. |
| D. | Black and dull surfaces are good reflectors of heat. |
| Answer» D. Black and dull surfaces are good reflectors of heat. | |
| 1570. |
Four boxes made of different materials are left in the Sun for half an hour. Which one of the boxes will be the hottest after half an hour? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 1571. |
Why do cooking vessels usually have copper bottoms? |
| A. | Copper has low melting point. |
| B. | Copper is an insulator of heat. |
| C. | Copper is a good conductor of heat. |
| D. | Copper is cheap. |
| Answer» D. Copper is cheap. | |
| 1572. |
There are four cups made of different materials: Silver, aluminium, wood and copper. In which of them will tea remain warm for a longer time? |
| A. | Silver cup |
| B. | Aluminium cup |
| C. | Wooden cup |
| D. | Copper cup |
| Answer» D. Copper cup | |
| 1573. |
For a clinical thermometer we use a solid and a liquid. The liquid used in a clinical thermometer is |
| A. | a metal |
| B. | a non-metal |
| C. | neither a metal nor a non-metal |
| D. | none of the above is correct |
| Answer» B. a non-metal | |
| 1574. |
Why do solar panels have black surfaces? |
| A. | Because they are good absorbers of heat |
| B. | Because they are bad absorbers of heat |
| C. | Because they are good reflectors of heat |
| D. | Because they are bad radiators of heat |
| Answer» B. Because they are bad absorbers of heat | |
| 1575. |
What is temperature? |
| A. | The rate of expansion of an object |
| B. | The loss of heat energy |
| C. | The volume of a gas occupied |
| D. | The degree of hotness or coldness of a body |
| Answer» E. | |
| 1576. |
Sea breeze refers to |
| A. | Cold air that moves from sea towards land during night time. |
| B. | Cold air that moves from sea towards land during day time. |
| C. | Both the above. |
| D. | None of the above. |
| Answer» C. Both the above. | |
| 1577. |
A What happens when the temperature of a substance is increased? |
| A. | Kinetic energy of the molecules of the substance increases. |
| B. | Kinetic energy of the molecules of the substance decreases. |
| C. | The amplitude of vibrations of molecules of the substance about their mean position decreases. |
| D. | It does not cause any change. |
| Answer» B. Kinetic energy of the molecules of the substance decreases. | |
| 1578. |
The device used to measure temperature of human body and is provided with a scale of temperature range\[35{}^\circ C\]to\[42{}^\circ C\]is called...... |
| A. | Thermometer |
| B. | Clinical thermometer |
| C. | Laboratory thermometer |
| D. | None of these |
| Answer» C. Laboratory thermometer | |
| 1579. |
Which part of a thermos flask prevents loss of heat through radiation? |
| A. | Vacuum |
| B. | Cork stopper |
| C. | Double glass walls |
| D. | Shiny/silvery wall |
| Answer» E. | |
| 1580. |
In a vacuum flask, which methods of heat transfer are prevented by the vacuum? |
| A. | Conduction only |
| B. | Convection only |
| C. | Conduction and convection only |
| D. | Conduction, convection and radiation |
| Answer» D. Conduction, convection and radiation | |
| 1581. |
Riaz needs a box which can absorb the heat from the sun very fast but lose it very slowly. How should the outer and the inner surface of the box be colored so that he gets the best result? |
| A. | Outer-Silver/Inner-Silver |
| B. | Outer-Black/Inner-Black |
| C. | Outer - Silver, Inner ? Black |
| D. | Outer - Black, Inner ? Silver |
| Answer» E. | |
| 1582. |
Near coastal regions, the sea breeze blows: |
| A. | during day time only |
| B. | during night time only |
| C. | throughout the day and night |
| D. | none of the above |
| Answer» B. during night time only | |
| 1583. |
Which of the following statements is true about convection? |
| A. | In solids, heat is transferred only by convection. |
| B. | Convection occurs in cold liquids. |
| C. | Convection requires a medium for transmission. |
| D. | Heat flows from the cold end to the hot end in a substance. |
| Answer» D. Heat flows from the cold end to the hot end in a substance. | |
| 1584. |
What is the energy conversion taking place in an electric heater? |
| A. | Chemical energy is converted to electrical energy. |
| B. | Electrical energy is converted to chemical energy. |
| C. | Heat energy is converted to electrical energy. |
| D. | Electrical energy is converted to heat energy. |
| Answer» E. | |
| 1585. |
More is the difference in temperature of the bodies in contact: |
| A. | More is the rate of flow of heat from a body at a higher temperature to a body at lower temperature. |
| B. | More is the rate of flow of heat from a body at a lower temperature to a body at higher temperature. |
| C. | There is no change in the rate of flow of heat |
| D. | None of the above |
| Answer» B. More is the rate of flow of heat from a body at a lower temperature to a body at higher temperature. | |
| 1586. |
What enables birds to glide effortlessly in the air? |
| A. | Conduction of heat in the air |
| B. | Radiation through the atmosphere |
| C. | Convection currents of air |
| D. | More sugar in their body cells |
| Answer» D. More sugar in their body cells | |
| 1587. |
The clinical thermometers presently in use in India are marked with a temperature scale. This scale corresponds to which of the following? |
| A. | Celsius |
| B. | Farenheit |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» B. Farenheit | |
| 1588. |
What must be done to enable mercury in a glass thermometer to respond quickly to changes in temperature? |
| A. | The bore should be narrow. |
| B. | The wall of stem should be thin. |
| C. | The bulb should contain a lot of mercury. |
| D. | The wall of glass bulb should be thin. |
| Answer» E. | |
| 1589. |
Which canned drink will remain cold the longest? |
| A. | P |
| B. | O |
| C. | R |
| D. | Both P and Q |
| Answer» B. O | |
| 1590. |
On which of the following scales of temperature, the temperature is never negative? |
| A. | Celsius |
| B. | Fahrenheit |
| C. | Reamer |
| D. | Kelvin |
| Answer» E. | |
| 1591. |
Rooms are fitted with ventilators to let hot air out. What is the phenomenon involved in the above? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Condensation |
| Answer» C. Radiation | |
| 1592. |
What do you mean by heat? |
| A. | Heat is a measure of temperature. |
| B. | Heat is a form of potential. |
| C. | It is form of energy which gets transferred from a hot to a cold body. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 1593. |
In which of the following is the rate of heat transfer more? |
| A. | Glass |
| B. | Copper |
| C. | Plastic |
| D. | Wood |
| Answer» C. Plastic | |
| 1594. |
Why are tea cups never made of metals? |
| A. | Metals are good conductors of heat. |
| B. | Metals are lustrous. |
| C. | Metals are expensive. |
| D. | Metals have high melting point. |
| Answer» B. Metals are lustrous. | |
| 1595. |
In places of hot climate it is advised that the outer walls of houses be painted white. |
| A. | White color is good reflector. So the heat falling on the wall gets reflected and wall is not heated |
| B. | White makes the wall look beautiful |
| C. | Other colors will be expensive |
| D. | None of the above |
| Answer» B. White makes the wall look beautiful | |
| 1596. |
Why stainless steel pans are generally provided with copper bottoms? |
| A. | Copper bottom makes the pan more durable |
| B. | Copper bottom makes the pan appear beautiful |
| C. | Copper is a better conductor of heat than steel |
| D. | Copper can be cleaned more easily as compared to steel |
| Answer» D. Copper can be cleaned more easily as compared to steel | |
| 1597. |
How is heat conducted in solids? |
| A. | From a high pressure to a low pressure region |
| B. | From a colder to a hotter region |
| C. | From a hotter to a colder region |
| D. | From a low pressure to a high pressure region |
| Answer» D. From a low pressure to a high pressure region | |
| 1598. |
The movement of cold air from sea towards land during daytime is called |
| A. | air breeze |
| B. | sea breeze |
| C. | land breeze |
| D. | None of these |
| Answer» C. land breeze | |
| 1599. |
When two objects are in thermal contact, how is the heat from one body to the other body transferred? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Insulation |
| Answer» B. Convection | |
| 1600. |
It is a reliable measure of degree of hotness of an object. It is |
| A. | heat |
| B. | temperature |
| C. | Both of these |
| D. | None of these |
| Answer» C. Both of these | |