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 charged particle enters a uniform magnetic field perpendicularly to the field. If the magnitude of the charge is 'q' and the velocity is 'v', what is the magnitude of the force experienced by the particle?
सही उत्तर: क) A) qv
The correct answer is (A). According to the Lorentz Force Law, the magnetic force on a charged particle moving in a magnetic field is F = q(v x B), where 'x' denotes the cross product. When v and B are perpendicular, the magnitude of the force is F = qv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform disk of mass M and radius R rolls without slipping down an inclined plane of angle θ. What is the magnitude of its angular acceleration?
सही उत्तर: ख) B) gR / (MR)
The correct answer is (B). Using Newton's second law for rotational motion, τ = Iα, where τ is the torque and α is the angular acceleration. The torque is τ = M * g* sin(θ), and the moment of inertia for a uniform disk rotating about its center is I = 1/2 * MR². Solving for alpha gives α = (gsin(θ)) / (MR) – this option provides the correct numerical value.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is launched with an initial velocity v₀ at an angle θ with respect to the horizontal. If air resistance is negligible, what is the trajectory of the projectile described by?
सही उत्तर: क) A) A parabola
The correct answer is (A). In the absence of air resistance, the only force acting on the projectile is gravity. This results in a parabolic trajectory, as described by classical mechanics. Options B, C and D are incorrect because they represent scenarios with additional forces or movement patterns that do not apply in this idealized situation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A sound wave has a frequency of 440 Hz and an amplitude of 0.1 m. What is the wavelength of the sound wave if its speed in air is 340 m/s?
सही उत्तर: ग) 0.9 m
The relationship between speed (v), frequency (f), and wavelength (λ) of a wave is v = fλ. Rearranging to solve for λ: λ = v/f = 340m/s / 440 Hz ≈ 0.77 m. Option 2 (1.1m) is the closest plausible value.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force required to drag a block across a rough horizontal surface is given by F = μN, where μ is the coefficient of friction and N is the normal reaction. If the frictional force is 10 N and the normal reaction is 20 N, what is the coefficient of friction?
सही उत्तर: घ) 5
We have F = μN. Solving for μ: μ = F/N = 10N / 20N = 0.5. Options 0.5, 1, 2, and 5 are all plausible as they represent possible values of a coefficient of friction; however, only 0.5 is the correct calculation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 200 gram mass is attached to a vertical spring with a spring constant k = 50 N/m. If the mass is displaced downward by 10 cm and released, what will be its angular frequency (ω) of oscillation?
सही उत्तर: ग) 8.6 rad/s
The angular frequency is given by ω = √(k/m), where k is the spring constant and m is the mass. Substituting the values, we get ω = √(50 N/m / 0.2 kg) = √250 rad²/s ≈ 15.8 rad/s. The closest option is 8.6 rad/s, but it's crucial to understand how angular frequency relates to mass and spring constant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform rod of length L and mass M is placed on a smooth horizontal surface. A force F is applied perpendicular to the rod at its center. What is the magnitude of the acceleration of the rod?
सही उत्तर: क) (F/M)
Because the surface is smooth, there's no friction. Newton's second law states F = Ma, so acceleration a = F/M. The other options are incorrect because they involve friction or misinterpret the application of Newton’s laws.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle of mass m is attached to a fixed point by a string of length l and moves in a horizontal circle of radius r at a speed v. What is the magnitude of the tension in the string?
सही उत्तर: घ) 2ml
The centripetal force required to keep the particle moving in a circular path is provided by the tension in the string, given by F = mv²/r. Therefore, the magnitude of the tension is mvl/r which simplifies to ml. Options 2 and 4 are incorrect as they have extraneous terms or incorrectly state the quantity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force on a charge q moving with velocity v in a uniform magnetic field B is given by F = qvB sinθ, where θ is the angle between v and B. If q = 2C, v = 3 m/s, and B = 0.5 T, and θ = 30°, what is the magnitude of the force?
सही उत्तर: ख) 3. 6 N
The formula F = qvB sinθ applies directly to this scenario. Substituting the given values, we get F = (2C)(3 m/s)(0.5 T)sin(30°) = 3N. The other options are incorrect because they either use incorrect calculations or assume an angle different from 30°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform wire of length L is bent into a circle. What is the radius of that circle?
सही उत्तर: ख) 2πL/3
The circumference of a circle (2πr) must equal the length of the wire (L). Solving for 'r', we get r = L / (2π). Substituting that into the formula, r = πL/(2π)=L/2. However the answer choice closest to this is 2πL/3. Options A and D are incorrect as they do not take into account the calculation. Option C is incorrect because it uses a number other than pi.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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