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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2451. |
By increasing the pressure on the ice, its melting point. . . . . . . |
| A. | will decrease |
| B. | Will increase |
| C. | will remain unchanged |
| D. | will be zero |
| Answer» B. Will increase | |
| 2452. |
Are the inner walls of the thermos flask bright? |
| A. | To prevent heat loss by convection |
| B. | To prevent heat loss caused by radiation |
| C. | To prevent heat loss by conduction |
| D. | none of the above |
| Answer» C. To prevent heat loss by conduction | |
| 2453. |
On heating an object, its molecules. . . . . . . . |
| A. | speed will increase |
| B. | the energy will decrease |
| C. | load will increase |
| D. | the load will decrease |
| Answer» B. the energy will decrease | |
| 2454. |
Why does it snow on high hills? |
| A. | Some gas on high hills stores water vapor |
| B. | Clouds are closer to the earth on the hills, so the water vapor freezes into ice. |
| C. | On high hills the temperature is less than the freezing point, so the water vapor freezes into ice. |
| D. | none of the above |
| Answer» D. none of the above | |
| 2455. |
Which temperature of measurement in Celsius is equal to 300K? |
| A. | 30℃ |
| B. | 27℃ |
| C. | 300℃ |
| D. | none of these |
| Answer» C. 300℃ | |
| 2456. |
The process of making camphor vapor from a solid is called? |
| A. | evaporation |
| B. | Freezing |
| C. | to melt |
| D. | sublimation |
| Answer» E. | |
| 2457. |
If a metal is used to make cooking utensils, then the thermal conductivity of . . . . . . . |
| A. | should be less |
| B. | should be more |
| C. | electrical conductivity should be low |
| D. | density should be higher |
| Answer» B. should be more | |
| 2458. |
Running a fan in hot weather makes one feel comfortable, because . . . . . . . . . |
| A. | fan blows cool air |
| B. | our sweat evaporates rapidly |
| C. | more heat is radiated to our body |
| D. | air circulation increases |
| Answer» C. more heat is radiated to our body | |
| 2459. |
The heat emitted or absorbed which changes the state of matter, but does not cause any change in temperature, is called? |
| A. | specific heat |
| B. | absorbed heat |
| C. | heat emitted |
| D. | latent heat |
| Answer» E. | |
| 2460. |
In which method of transmission of heat, the molecules of matter do not move themselves from one place to another? |
| A. | driving |
| B. | convection |
| C. | radiation |
| D. | all three |
| Answer» B. convection | |
| 2461. |
Which of the following has the highest value of specific heat? |
| A. | glass |
| B. | copper |
| C. | lead |
| D. | water |
| Answer» E. | |
| 2462. |
Which part of the sun's radiation heats up the solar cooker? |
| A. | ultraviolet rays |
| B. | infrared ray |
| C. | cosmic ray |
| D. | light beam |
| Answer» C. cosmic ray | |
| 2463. |
Woolen clothes keep us warm in winters because . . . . . |
| A. | provide heat |
| B. | does not radiate heat |
| C. | prevents air from coming in contact with the body |
| D. | prevents body heat from leaving |
| Answer» E. | |
| 2464. |
Thermos flask keeps liquids hot for a long time because . . . . . . . . . |
| A. | When gas is filled in it, it emits heat |
| B. | has internal heating |
| C. | Shiny inner wall and double walls of outer cover prevent heat from escaping or entering |
| D. | none of the above |
| Answer» D. none of the above | |
| 2465. |
How much temperature can be measured with radiation pyrometer? |
| A. | 100 - 250℃ |
| B. | 100℃ |
| C. | 250 - 500℃ |
| D. | 500℃ |
| Answer» E. | |
| 2466. |
Woolen clothes are warmer than cotton because they . . . . . . . |
| A. | are good absorbers of heat |
| B. | are good distributors of heat |
| C. | heavier than cotton |
| D. | good insulators of heat |
| Answer» E. | |
| 2467. |
How is water heated in an electric kettle? |
| A. | due to driving |
| B. | due to convection |
| C. | due to radiation |
| D. | all these |
| Answer» C. due to radiation | |
| 2468. |
Which of the following is/are statements? |
| A. | The ratio of the work done and the heat generated is a constant called the mechanical equivalent of heat. |
| B. | Celsius was the inventor of the Celius scale |
| C. | The freezing point is marked at 2730 K on the Kelvin scale. |
| D. | All of the above |
| Answer» E. | |
| 2469. |
What are the methods of transmission of heat (Transmission and f Heat)? |
| A. | Conduction |
| B. | Radiation |
| C. | Convection |
| D. | all these |
| Answer» E. | |
| 2470. |
Which of the following is the most appropriate color combination in an umbrella to avoid the sun? |
| A. | top black bottom white |
| B. | top white bottom black |
| C. | top and bottom black |
| D. | top and bottom white |
| Answer» C. top and bottom black | |
| 2471. |
What is used in hydraulic press? |
| A. | pascal rule |
| B. | Bernoulli's theory |
| C. | Archimedes theory |
| D. | boyle's theory |
| Answer» B. Bernoulli's theory | |
| 2472. |
Which conservation principle applies to the speed of rockets? |
| A. | conservation of mass |
| B. | conservation of charge |
| C. | conservation of momentum |
| D. | Energy conservation |
| Answer» D. Energy conservation | |
| 2473. |
What is once equal to? |
| A. | 103 Pa |
| B. | 100 Pa |
| C. | 105 Pa |
| D. | 104 Pa |
| Answer» D. 104 Pa | |
| 2474. |
We are advised to wear white clothes in summers because . . . . . . . |
| A. | they look cute |
| B. | they can be seen from afar |
| C. | White clothes absorb less heat |
| D. | it's a tradition |
| Answer» D. it's a tradition | |
| 2475. |
0℃ on the Celsius scale is equal to how many degrees on the Fahrenheit scale? |
| A. | 5 degrees |
| B. | 32 degree |
| C. | 64 degree |
| D. | 273 degrees |
| Answer» C. 64 degree | |
| 2476. |
By what principle do hydraulic machines work? |
| A. | Newton's theory |
| B. | joule principle |
| C. | pascal principle |
| D. | Flood theory |
| Answer» D. Flood theory | |
| 2477. |
What is the temperature of boiling water at normal atmospheric pressure on the Fahrenheit scale? |
| A. | 32° F |
| B. | 100° F |
| C. | 180° F |
| D. | 212° F |
| Answer» E. | |
| 2478. |
The air in the room when a table fan is run in a closed room. . . . |
| A. | will be hot |
| B. | will be cold |
| C. | will have no effect |
| D. | none of these |
| Answer» B. will be cold | |
| 2479. |
Which of the following changes occur when salt is added to water? |
| A. | The boiling point increases and the freezing point decreases. |
| B. | The boiling point decreases and the freezing point increases. |
| C. | Both boiling point and freezing point decrease. |
| D. | Both the boiling point and the freezing point increase. |
| Answer» B. The boiling point decreases and the freezing point increases. | |
| 2480. |
On the top of a hill, water starts boiling at a relatively low temperature, because . . . . . . |
| A. | Atmospheric pressure remains low. |
| B. | Atmospheric pressure remains high. |
| C. | It takes more heat to burn wood. |
| D. | The surrounding air is cold. |
| Answer» B. Atmospheric pressure remains high. | |
| 2481. |
If the door of the refrigerator kept in the room is opened, then the temperature of the room. . . |
| A. | will decrease |
| B. | Will increase |
| C. | will be 00 |
| D. | will remain unchanged |
| Answer» C. will be 00 | |
| 2482. |
When sealed biscuits are kept inside the refrigerator for some time they become crunchy because . . . |
| A. | Cold brings out excess moisture |
| B. | Humidity is high inside the fridge and hence excess moisture is absorbed |
| C. | Humidity is high inside the fridge, which helps more moisture to come out |
| D. | The pressure inside the fridge is high, which helps more moisture to come out |
| Answer» C. Humidity is high inside the fridge, which helps more moisture to come out | |
| 2483. |
Whenever work is converted into heat or heat is converted into work, the ratio of work done and heat produced is a constant which is called heat or mechanical equivalent. Do they have value? |
| A. | 4186 joules / kcal |
| B. | 186 Joules / Calorie |
| C. | 4.186 X 10⁷ |
| D. | all these |
| Answer» E. | |
| 2484. |
Is it protected by the first law of thermodynamics? |
| A. | momentum |
| B. | energy |
| C. | both momentum and energy |
| D. | none of these |
| Answer» C. both momentum and energy | |
| 2485. |
The temperature of the object indicates that the heat on contact. . . |
| A. | will flow into the object of higher temperature than that object |
| B. | In an object of relatively low temperature, the current will flow through that object. |
| C. | will flow into the earth from that object |
| D. | will flow from the earth to that object |
| Answer» C. will flow into the earth from that object | |
| 2486. |
Dew does not form in a strong windy night, because . . . . |
| A. | the rate of evaporation is faster |
| B. | low humidity in the air |
| C. | temperature stays high |
| D. | the sky is not clear |
| Answer» B. low humidity in the air | |
| 2487. |
What is the body temperature of a healthy human being? |
| A. | 37°C |
| B. | 370 Fahrenheit |
| C. | 98. 4°C |
| D. | 98. 40 Kelvin |
| Answer» B. 370 Fahrenheit | |
| 2488. |
The rate of evaporation for a certain liquid depends on? |
| A. | at the temperature of the liquid |
| B. | on the open surface area of the liquid |
| C. | at air temperature |
| D. | on all the above factors |
| Answer» E. | |
| 2489. |
The reason why the snow covered on the mountains does not melt together by the heat of the sun? |
| A. | it becomes very hard |
| B. | It reflects most of the heat received from the Sun. |
| C. | its specific heat capacity is low |
| D. | It has high latent heat of fusion |
| Answer» C. its specific heat capacity is low | |
| 2490. |
Why can two thin shirts keep us warmer in winter than one thick shirt? |
| A. | Two thin shirts become thicker, hence preventing the transfer of heat |
| B. | The layer of air between two shirts acts as a conductor |
| C. | The air layer between two shirts acts as a barrier |
| D. | heat does not radiate |
| Answer» D. heat does not radiate | |
| 2491. |
Sublimation is a substance? |
| A. | Kapoor |
| B. | Naphthalene |
| C. | ammonium chloride |
| D. | all these |
| Answer» E. | |
| 2492. |
Thermostat is a device that . . . . . . . |
| A. | measures heat |
| B. | measures the temperature |
| C. | self-regulates the temperature of a system |
| D. | self-regulates the pressure of a body |
| Answer» D. self-regulates the pressure of a body | |
| 2493. |
In the metal used in the manufacture of wires for making connectors. . . . . . |
| A. | Must have very low resistivity and high melting point |
| B. | Must have high resistivity and low melting point |
| C. | Must have low resistivity and low melting point |
| D. | Must have high resistivity and high melting point |
| Answer» D. Must have high resistivity and high melting point | |
| 2494. |
When a long dry hair is brushed , the latein is often separated from each other , because while brushing . . . . . . . . . . |
| A. | air depressurization through braids |
| B. | Static electric charge is induced on the hair |
| C. | mechanical energy is converted into heat energy |
| D. | The gravity between the strands becomes relatively less |
| Answer» C. mechanical energy is converted into heat energy | |
| 2495. |
When 1 kg of a liquid changes from liquid to vapor at its boiling point, what is the heat absorbed in it called? |
| A. | substance in vaporization |
| B. | latent heat of fusion |
| C. | latent heat of sublimation |
| D. | none of these |
| Answer» B. latent heat of fusion | |
| 2496. |
The leaves of Mimosa (Mimosa Pudica pudica) represent? |
| A. | Geotropism |
| B. | Thigmotropism |
| C. | Nyctinasty |
| D. | Seismonasty |
| Answer» E. | |
| 2497. |
Soap bubbles appear colored when viewed in white light. The reason for this incident? |
| A. | interference |
| B. | interference |
| C. | Dispersion |
| D. | ध्रुवण ( polarization ) |
| Answer» C. Dispersion | |
| 2498. |
Fog is a colloidal solution of which of the following? |
| A. | gaseous liquid |
| B. | gas dispersed in liquid |
| C. | solid dispersed in liquid |
| D. | liquid dispersed in liquid |
| Answer» B. gas dispersed in liquid | |
| 2499. |
A person of dark skin compared to a person of fair skin . . . . . . . . |
| A. | will experience less heat and less winter |
| B. | will experience less heat and more cold |
| C. | will experience more heat and less winter |
| D. | will experience more heat and more cold |
| Answer» D. will experience more heat and more cold | |
| 2500. |
What is the volume of 4.4 grams of carbon dioxide at STP? |
| A. | 0.224 liters |
| B. | 0 . 112 liters |
| C. | 2 . 24 liters |
| D. | 12 liters |
| Answer» C. 2 . 24 liters | |