MCQOPTIONS
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MCQOPTIONS
This section includes 205 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A fan produces a feeling of comfort during hot weather, because |
| A. | our body radiates more heat in air |
| B. | fan supplies cool air |
| C. | conductivity of air increases |
| D. | our perspiration evaporates rapidly |
| Answer» E. | |
| 2. |
A man with a dark skin, in comparison with a man with a white skin, will experience |
| A. | less heat and less cold |
| B. | less heat and more cold |
| C. | more heat and less cold |
| D. | more heat and more cold |
| Answer» D. more heat and more cold | |
| 3. |
When water is heated from 0 C to 10 C, its volume |
| A. | increases |
| B. | decreases |
| C. | does not change |
| D. | first decreases and then increases |
| Answer» E. | |
| 4. |
If a liquid is heated in space under no gravity, the transfer of heat will take place by process of |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | can not be heated in the absence of gravity |
| Answer» D. can not be heated in the absence of gravity | |
| 5. |
Evening Sun is not as hot as the mid day sun. What is the reason? |
| A. | In the evening, radiation travel slowly |
| B. | In the evening, the temperature of the sun decreases |
| C. | Ozone in atmosphere absorbs more light in the evening |
| D. | In the evening, radiations travels larger distance through atmosphere |
| Answer» E. | |
| 6. |
L.P.G. is mostly liquefied |
| A. | hydrogen |
| B. | oxygen |
| C. | butane |
| D. | methane |
| Answer» D. methane | |
| 7. |
Why do two ice blocks join to from one block when pressed together? |
| A. | Melting point of ice is lowered with increase in pressure |
| B. | Melting point of ice increases with increase in pressure |
| C. | Melting point of ice remains unchanged with increase in pressure |
| D. | Melting point of ice 0 C |
| Answer» B. Melting point of ice increases with increase in pressure | |
| 8. |
Compared to burn due to air at 100 C, a burn due to steam at 100 C is |
| A. | Less dangerous |
| B. | more dangerous |
| C. | equally dangerous |
| D. | None of these |
| Answer» C. equally dangerous | |
| 9. |
Pyrometer is used to measure |
| A. | air pressure |
| B. | humidity |
| C. | high temperature |
| D. | intensity of earthquake |
| Answer» D. intensity of earthquake | |
| 10. |
The sprinkling of water slightly reduces the temperature of a closed room because |
| A. | temperature of water is less than that of the room |
| B. | specific heat of water is high |
| C. | water has large latent heat of vaporisation |
| D. | water is a bad conductor of heat |
| Answer» D. water is a bad conductor of heat | |
| 11. |
Which one of the following liquids is very good conductor of heat ? |
| A. | Mercury |
| B. | Water |
| C. | Ether |
| D. | Benzene |
| Answer» B. Water | |
| 12. |
During the change of state of matter the temperature of the substance |
| A. | increases |
| B. | decreases |
| C. | remain the same |
| D. | may increases or decrease |
| Answer» D. may increases or decrease | |
| 13. |
When water is heated from 0 C to 4 C, its volume |
| A. | increases |
| B. | decreases |
| C. | first increase then decrease |
| D. | remains the same |
| Answer» C. first increase then decrease | |
| 14. |
Heat detectors in human skin are sensitive to wavelengths |
| A. | > 780 nm |
| B. | 600 - 780 nm |
| C. | 400 - 600 nm |
| D. | < 400 nm |
| Answer» E. | |
| 15. |
A metal sheet with a circular hole is heated. The hole |
| A. | gets larger |
| B. | gets smaller |
| C. | remains of the same size |
| D. | gets deformed |
| Answer» B. gets smaller | |
| 16. |
Thermostat is a device which |
| A. | measures heat |
| B. | measures temperature |
| C. | automatically regulates the temperature of a system |
| D. | automatically regulates the pressure of a system |
| Answer» D. automatically regulates the pressure of a system | |
| 17. |
Air is filled in vehicle tyres because |
| A. | it is non-conducting |
| B. | it is cheap |
| C. | it has low density |
| D. | it is highly compressible |
| Answer» E. | |
| 18. |
The safest temperature for keeping food fresh in a refrigerator is |
| A. | 4 C |
| B. | 8 C |
| C. | 0 C |
| D. | 10 C |
| Answer» B. 8 C | |
| 19. |
If the doors of a refrigerator are left open for a few hours, the room temperature will |
| A. | decreases |
| B. | increases |
| C. | remain the same |
| D. | decrease only in the area in the vicinity of the refrigerator |
| Answer» C. remain the same | |
| 20. |
The instrument used to measure the temperature of the source from its thermal radiation is |
| A. | hydrometer |
| B. | barometer |
| C. | thermopile |
| D. | pyrometer |
| Answer» D. pyrometer | |
| 21. |
Scent sprayer is based on |
| A. | Charles's law |
| B. | Boyle's law |
| C. | Archimedes's principle |
| D. | Bernoulli's principle |
| Answer» E. | |
| 22. |
Cooling is not done by |
| A. | flow of water |
| B. | release of compressed gas |
| C. | burning cooking gas |
| D. | melting the solid |
| Answer» D. melting the solid | |
| 23. |
Refrigeration helps in food preservation by |
| A. | Killing the germs |
| B. | reducing the rate of biochemical reactions |
| C. | destroying enzyme action |
| D. | sealing the food with a layer of ice |
| Answer» C. destroying enzyme action | |
| 24. |
When ice melts, then the |
| A. | volume increases |
| B. | volume decreases |
| C. | mass increases |
| D. | mass decrease |
| Answer» C. mass increases | |
| 25. |
At which temperature the Centigrade and Fahrenheit scales are equal ? |
| A. | 40 |
| B. | - 40 |
| C. | 37 |
| D. | 94.6 |
| Answer» C. 37 | |
| 26. |
When air is saturated, it cannot hold |
| A. | More water vapour |
| B. | More air |
| C. | More CO |
| D. | More O |
| Answer» B. More air | |
| 27. |
The unit of RH are |
| A. | kg-m |
| B. | kg |
| C. | kg-m |
| D. | none of these |
| Answer» E. | |
| 28. |
A sample of gas expands from volume V1 to V2 The amount of work done by the gas is greatest when the expansion is |
| A. | Iso-thermal |
| B. | Isobaric |
| C. | Adiabatic |
| D. | Equal in all cases |
| Answer» C. Adiabatic | |
| 29. |
Specific heat of a metal at very low temperatures varies as |
| A. | T |
| B. | T |
| C. | T |
| D. | T |
| Answer» B. T | |
| 30. |
Which of the following statement (s) is (are) true about thermal radiations?(i) Thermal radiation are electromagnetic waves(ii) All bodies emit thermal radiations at all temperature(iii) Thermal radiations are reflected from mirror(iv) Thermal radiations of all wavelengths travel in free space with same velocityChoose the correct answer |
| A. | (i), (ii) and (iii) |
| B. | (ii), (iii) and (iv) |
| C. | (iii) and (iv) |
| D. | All of them |
| Answer» E. | |
| 31. |
Which of the following statements are true regarding heat?1. Heat is a form of energy2. Heat can be reflected by mirror3. Heat is an electromagnetic radiation4. Heat can not pass through vacuumSelect the correct answer from the codes given below Codes : |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 32. |
Consider the following statements 1. Steam at 100 C contain same amount of heat2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water3. In air-conditioner, coils and is rejected out at the condenser coilsWhich of these statements is / are correct ? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | Only 2 |
| D. | Only 3 |
| Answer» E. | |
| 33. |
Two bodies A and B are of same mass and same amount of heat is given to both of them.If the temperature of A increases more than that of B because of heat addition, then. |
| A. | The specific heat capacity of A is more than that of B |
| B. | The specific heat capacity of A is less than that of B |
| C. | Both A and B have the same specific heat capacity but A has greater thermal conductivity |
| D. | Both A and B have the same specific heat capacity but B has greater thermal conductivity |
| Answer» C. Both A and B have the same specific heat capacity but A has greater thermal conductivity | |
| 34. |
Compared to burn |
| A. | Less dangerous |
| B. | more dangerous |
| C. | equally dangerous |
| D. | None of these |
| Answer» C. equally dangerous | |
| 35. |
A fan |
| A. | our body radiates more heat in air |
| B. | fan supplies cool air |
| C. | conductivity of air increases |
| D. | our perspiration evaporates rapidly |
| Answer» E. | |
| 36. |
A man with a |
| A. | less heat and less cold |
| B. | less heat and more cold |
| C. | more heat and less cold |
| D. | more heat and more cold |
| Answer» D. more heat and more cold | |
| 37. |
During the change of state of matter the |
| A. | increases |
| B. | decreases |
| C. | remain the same |
| D. | may increases or decrease |
| Answer» D. may increases or decrease | |
| 38. |
L.P.G. |
| A. | hydrogen |
| B. | oxygen |
| C. | butane |
| D. | methane |
| Answer» D. methane | |
| 39. |
Why do two |
| A. | Melting point of ice is lowered with increase in pressure |
| B. | Melting point of ice increases with increase in pressure |
| C. | Melting point of ice remains unchanged with increase in pressure |
| D. | Melting point of ice 0 C |
| Answer» B. Melting point of ice increases with increase in pressure | |
| 40. |
Evening Sun |
| A. | In the evening, radiation travel slowly |
| B. | In the evening, the temperature of the sun decreases |
| C. | Ozone in atmosphere absorbs more light in the evening |
| D. | In the evening, radiations travels larger distance through atmosphere |
| Answer» E. | |
| 41. |
If the doors of a |
| A. | decreases |
| B. | increases |
| C. | remain the same |
| D. | decrease only in the area in the vicinity of the refrigerator |
| Answer» C. remain the same | |
| 42. |
Thermostat |
| A. | measures heat |
| B. | measures temperature |
| C. | automatically regulates the temperature of a system |
| D. | automatically regulates the pressure of a system |
| Answer» D. automatically regulates the pressure of a system | |
| 43. |
Pyrometer |
| A. | air pressure |
| B. | humidity |
| C. | high temperature |
| D. | intensity of earthquake |
| Answer» D. intensity of earthquake | |
| 44. |
Heat detectors |
| A. | > 780 nm |
| B. | 600 - 780 nm |
| C. | 400 - 600 nm |
| D. | < 400 nm |
| Answer» E. | |
| 45. |
Scent sprayer |
| A. | Charles's law |
| B. | Boyle's law |
| C. | Archimedes's principle |
| D. | Bernoulli's principle |
| Answer» E. | |
| 46. |
Cooling |
| A. | flow of water |
| B. | release of compressed gas |
| C. | burning cooking gas |
| D. | melting the solid |
| Answer» D. melting the solid | |
| 47. |
At which temperature the |
| A. | 40 |
| B. | - 40 |
| C. | 37 |
| D. | 94.6 |
| Answer» C. 37 | |
| 48. |
Refrigeration |
| A. | Killing the germs |
| B. | reducing the rate of biochemical reactions |
| C. | destroying enzyme action |
| D. | sealing the food with a layer of ice |
| Answer» C. destroying enzyme action | |
| 49. |
A gas behaves as an ideal gas more closely at |
| A. | Low pressure and high temperature |
| B. | High pressure and low temperature |
| C. | Low pressure and low temperature |
| D. | High pressure and high temperature |
| Answer» D. High pressure and high temperature | |
| 50. |
The heat transferred by the radiator of a refrigerator is |
| A. | More than that a t the freezer |
| B. | Less than that at the freezer |
| C. | The same that at the freezer |
| D. | None of the above |
| Answer» B. Less than that at the freezer | |