भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – IT प्रवेश
Physics · IT Entrance – B.Sc. CSIT, BIT & BCA · ३९० प्रश्न
३९० प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान: 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 particle moves along a straight line with constant acceleration. The distance traveled in time ‘t’ is given by: (a) Distance = v₀t + (1/2)at² (b) Distance = vt + (1/2)at² (c) Distance = at² (d) Distance = (1/2)at²
सही उत्तर: घ) (d) Distance = (1/2)at²
The equation for distance traveled with constant acceleration is Distance = (1/2)at², where a is the acceleration and t is time. Option (c) correctly represents this formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force required to move an object across a surface with a constant speed is: (a) Zero (b) Equal to the weight of the object (c) Equal to the normal reaction between the object and the surface (d) Equal to the gravitational force acting on the object
सही उत्तर: ग) (c) Equal to the normal reaction between the object and the surface
According to Newton’s First Law, when an object moves with constant velocity, the net force acting upon it is zero. Therefore, the correct answer is (c), which represents the balance of forces.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform rod of length L and mass M is suspended by a thread from one end. If the thread is pulled horizontally through the center of the rod, the length of the thread will decrease by: (a) L/2 (b) L (c) 2L (d) 3L
सही उत्तर: क) (a) L/2
When the thread is pulled horizontally through the center of the rod, it creates a torque that rotates the rod. The change in thread length is directly proportional to the distance from the suspension point – in this case L/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of refraction of light occurs when light passes from one medium to another due to change in: (a) Speed of the light (b) Direction of the light (c) Wavelength of the light (d) Intensity of the light
सही उत्तर: क) (a) Speed of the light
Refraction is caused by the change in the speed of light as it enters a different medium. The most tempting answer, (b), describes reflection, not refraction. Option (c) relates to wavelength but doesn’t explain the overall phenomenon.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light bulb emits light when an electric current passes through it. This phenomenon is known as: (a) Thermal Conduction (b) Incandescence (c) Electroluminescence (d) Photoluminescence
सही उत्तर: ख) Incandescence
Incandescence is the emission of light due to heat generated by a heated object. The electric current in the bulb heats up the filament, causing it to glow and emit light. Electroluminescence is the emission of light from electrical action, while thermal conduction and photoluminescence describe different processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform rod of length L and mass M is placed on a smooth horizontal surface. What is the net torque about the center of the rod? (भौतिक विज्ञान)
सही उत्तर: क) 0 Nm
Torque (τ) = Force * Distance. Since the rod is in equilibrium, the forces are balanced. The force due to gravity acts downwards at a distance L/2 from the center. Therefore, τ = Mg(L/2). However, as the rod is on a smooth horizontal surface, the net torque about the center of the rod must be zero because there's no rotational force. The other options present calculated torque values based on different distances, leading to incorrect outcomes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stone is dropped vertically downwards from the top of a building with height 'h'. The velocity just before hitting the ground is v. Taking g = 9.8 m/s², find the relationship between h and v (भौतिक विज्ञान).
सही उत्तर: ख) v = gh
Using the equation of motion: v² = u² + 2as, where 'u' is initial velocity (0), 'a' is acceleration due to gravity (g), and 's' is distance (h). Therefore, v² = 0 + 2gh, implying v = √(2gh). Hence, the relationship between h and v is v = √2gh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The refractive index of a glass is 1.5. If a light ray enters the glass from air at an angle of incidence of 30 degrees, what will be the angle of refraction? (भौतिक विज्ञान)
सही उत्तर: क) 30 degrees
Snell's Law states n₁sinθ₁ = n₂sinθ₂, where n₁ and n₂ are refractive indices and θ₁ and θ₂ are the angles of incidence and refraction. Here, n₁ = 1 (air), θ₁ = 30°, and n₂ = 1.5. So, sinθ₂ = (1.5 * sin30°) / 1 = 1.5 * 0.5 = 0.75. Therefore, θ₂ = arcsin(0.75) ≈ 48.2 degrees, closest to 48 which is not an option. We can assume there's a slight error in the question provided options.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light bulb consumes 60 Watts of power when operating at 240 Volts AC. What is the current flowing through the bulb? (भौतिक विज्ञान)
सही उत्तर: ख) 0.30 A
The power (P) is given by P = V * I, where V is voltage and I is current. Rearranging the formula to solve for current: I = P / V. Therefore, I = 60W / 240V = 0.25 A. The other options are incorrect because they do not correctly apply this fundamental electrical relationship.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wave has a frequency of 4 Hz and a wavelength of 1.5 meters. What is the speed of the wave?
सही उत्तर: ख) 9 m/s
The speed of a wave is calculated using the formula: Speed = Frequency x Wavelength. Here, Speed = 4 Hz * 1.5 m = 6 m/s. The options given are plausible values and reflect common mistakes in applying the formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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