भौतिक विज्ञान – Physics MCQ

भौतिक विज्ञान: प्रश्न र उत्तर

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सही: ० / ०

51. The speed of sound in air is approximately 340 m/s. If a lightning flash is observed to occur at time t=0 and the thunder is heard 2.5 seconds later, what is the approximate distance between the observer and the point where the lightning struck?

    क118 meters ख340 meters ग850 meters घ1700 meters
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    छलफल / प्रश्न उत्तरमा गल्ती छ

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    टिप्पणी जाँचपछि मात्र देखिन्छ।

52. A force of 5 N is applied to a mass of 2 kg for 3 seconds. What is the momentum change of the mass?

    क10 Nm/s ख30 Nm/s ग15 Nm/s घ5 Nm/s
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53. The potential energy stored in a capacitor having capacitance 2 microfarads and charged to a voltage of 10 volts is:

    क5 x 10^-3 J ख10 x 10^-3 J ग2 x 10^-6 J घ20 x 10^-6 J
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    टिप्पणी जाँचपछि मात्र देखिन्छ।

54. A thermometer reads 25°C. What is its equivalent temperature in Fahrenheit?

    क77°F ख32°F ग104°F घ-25°F
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55. Which of the following statements best describes the principle of superposition in optics?

    कLight always travels at a constant speed regardless of its wavelength खMultiple light waves can simultaneously pass through a point, and the resultant amplitude is the sum of the individual amplitudes गReflection is caused by the change in velocity of light as it passes from one medium to another घThe intensity of light decreases exponentially with distance due to scattering
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56. The kinetic energy of a particle moving with velocity ‘v’ is given by KE = ½mv². If the momentum of a particle is ‘p’, what is its de Broglie wavelength?

    कp/2π ख2πp गπp घp/(2π)
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57. A metal block has a specific heat capacity of 400 J/kg·K. If 2 kg of the metal is heated at a rate of 1000 W, how long will it take for the metal to reach a temperature increase of 20°C?

    कa) 10 seconds खb) 20 seconds गc) 40 seconds घd) 80 seconds
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58. A projectile is launched with an initial velocity of 50 m/s at an angle of 60° to the horizontal. What is the magnitude of its acceleration at the highest point of its trajectory?

    कa) 0 m/s² खb) 9.81 m/s² गc) 49.0 m/s² घd) 2.45 m/s²
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59. The speed of sound in air at room temperature (approximately 20°C) is approximately 343 meters per second. Which of the following statements best describes this phenomenon?

    कa) Sound travels faster in colder air due to reduced molecular collisions. खb) Sound propagates as a wave, transferring energy through vibration without transporting matter. गc) The speed of sound is constant regardless of temperature and depends only on the material's properties. घd) Sound waves are reflected by objects, creating echoes.
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60. A particle is traveling in a straight line at a constant speed. Which of the following statements is true about its motion? (a) It has a non-zero acceleration. (b) Its velocity is constantly changing direction. (c) Its velocity and momentum are equal. (d) Its kinetic energy is zero.

    क(a) ख(b) ग(c) घ(d)
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    टिप्पणी जाँचपछि मात्र देखिन्छ।