भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – CEE प्रवेश
Physics · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०७ प्रश्न
४०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान (Physics): प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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A car is moving on a horizontal road at a uniform speed. At what point on the path does it have the maximum momentum?\newlinea) When the car is stationary\nb) When the car is accelerating\nc) When the car is decelerating\nd) When the car is moving with its maximum speed
सही उत्तर: क) a) When the car is stationary
Momentum (p) is calculated as mass (m) multiplied by velocity (v), i.e., p = mv. Since mass of the car remains constant, greater the velocity, larger the momentum. The maximum momentum occurs when the car has its maximum speed. Option b) is incorrect because acceleration involves a change in velocity and thus momentum. Option c) also incorrectly states that deceleration results in the maximum momentum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform magnetic field of 0.5 T exists in a direction perpendicular to the plane of a circular coil of radius 10 cm and having 50 turns. If the frequency of the alternating current passing through the coil is 50 Hz, what is the emf induced across the coil?
सही उत्तर: क) 2.5 V
The induced emf in an AC circuit is given by Faraday's Law: ε = -N(dΦ/dt), where N is the number of turns, Φ is magnetic flux and dΦ/dt is the rate of change of magnetic flux. Using this formula with the specified values, we find that the induced emf is 2.5V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves with a uniform acceleration of 5 m/s² from rest. After 10 seconds, its velocity becomes 30 m/s. What is the distance covered by the particle in this time?
सही उत्तर: क) 100 m
We can use the equation of motion: s = ut + (1/2)at², where s is the distance, u is the initial velocity (0 m/s), a is acceleration (5 m/s²) and t is time (10 s). Substituting the values, we get s = 0*(10) + (1/2)*5*10² = 250 meters. Option 200m is incorrect as it doesn't compute correctly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The power dissipated during the passage of current through a resistance is given by P = I²R. If a current of 2 A flows through a resistance of 10 Ω, what is the power dissipated?
सही उत्तर: क) 10 W
Using the formula P = I²R, we substitute I = 2A and R = 10Ω. Therefore, P = (2)² * 10 = 4 * 10 = 40 W. Option 20W is incorrect because it doesn't accurately compute the power based on the given values.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car travels at a uniform speed of 60 km/h. It covers a distance of 90 km in t hours. What is the value of t?
सही उत्तर: क) 1.5
We can use the formula: Distance = Speed × Time, so t = Distance / Speed. Therefore, t = 90 km / 60 km/h = 1.5 hours. The other options are incorrect as they do not result in the correct time duration given the distance and speed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A satellite is revolving around the earth at a distance of 800 km above the surface. If the velocity of the satellite is 8000 km/h, what is its orbital period in hours?
सही उत्तर: क) 240
The orbital period can be calculated using Kepler's Third Law (T² = (4π²/GM)r³). Given the radius (r) and velocity (v), we can find the orbital time. The correct answer is 360 hours, as this represents a reasonable orbital period for a satellite at that altitude and speed. Options 240, 480, and 600 are incorrect because they do not account for the specific parameters provided.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lens has a focal length of 50 cm. What type of lens is it? (Use g=9.8m/s²)
सही उत्तर: क) Converging Lens
A positive focal length indicates a converging lens, which refracts light rays towards each other to converge at the focal point. The other options are incorrect as they describe lenses with negative focal lengths or those that do not focus light.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The refractive index of a glass is 1.5 for light traveling in air and 1.6 for light traveling through the glass. What is the speed of light in glass? (Speed of light in air = 3 x 10^8 m/s)
सही उत्तर: ग) 2.5 x 10^8 m/s
The refractive index (n) is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in the medium (v): n = c/v. Therefore, v = c/n = (3 x 10^8 m/s)/1.6 = 1.875 x 10^8 m/s. The closest answer is 2.0 x 10^8 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wave is traveling along a stretched string. The frequency of the wave is 200 Hz and its wavelength is 1.5 m. What is the speed of the wave? (Use g = 9.8 m/s²)
सही उत्तर: ख) 600 m/s
The speed of a wave is calculated as wavelength multiplied by frequency (v = λf). Here, v = 1.5m * 200Hz = 300 m/s. The other options are incorrect because they do not correctly apply this fundamental formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform wire of length L and cross-sectional area A carries a current I. If the resistivity of the wire is ρ, what is the resistance R of the wire?
सही उत्तर: ख) 2ρL/A
The resistance (R) of a wire is given by R = ρL/A, where ρ is resistivity, L is length, and A is cross-sectional area. The correct option is ρL/A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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