भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – कृषि/वन प्रवेश
Physics · Agriculture, Veterinary & Forestry Entrance · ४२५ प्रश्न
४२५ 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 force of 20 N is applied to a stationary object with a mass of 5 kg. What will be the acceleration of the object? (a) 4 N/m² (b) 20 m/s² (c) 0.4 m/s² (d) 400 m/s²
सही उत्तर: क) (a) 4 N/m²
Option (c) is correct. Using Newton's second law of motion, F = ma, where F is force (20 N), m is mass (5 kg), and a is acceleration. Solving for 'a', we get a = F/m = 20/5 = 4 m/s². Options (a), (b) ,(d) are incorrect calculations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The kinetic energy of a car moving at a speed of 15 m/s with a mass of 1000 kg is: (a) 225 Joules (b) 7500 Joules (c) 15000 Joules (d) 30000 Joules
सही उत्तर: क) (a) 225 Joules
Option (b) is correct. Kinetic energy is calculated using the formula KE = ½mv², where m is mass (1000 kg) and v is velocity (15 m/s). Therefore, KE = ½ * 1000 * 15² = 7500 Joules. Options (a), (c), and (d) are incorrect due to calculation errors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light beam strikes a plane mirror at an angle of incidence of 30 degrees. What is the angle of reflection? (a) 30 degrees (b) 60 degrees (c) 90 degrees (d) 120 degrees
सही उत्तर: क) (a) 30 degrees
Option (a) is correct. According to the law of reflection, the angle of incidence equals the angle of reflection. Therefore, if the angle of incidence is 30 degrees, so is the angle of reflection. Options (b), (c), and (d) represent incorrect angles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upwards with an initial velocity of 20 m/s from the ground. What is its maximum height reached? (g = 9.8 m/s²) (a) 10 meters (b) 20 meters (c) 40 meters (d) 80 meters
सही उत्तर: क) (a) 10 meters
Option (a) is correct. Using the equation v² = u² + 2as, where v is final velocity (0 m/s at max height), u is initial velocity (20 m/s), a is acceleration (-9.8 m/s²) and s is displacement (max height). Solving for 's' gives approximately 10 meters. Options (b) , (c), and (d) are incorrect as they result from inaccurate calculations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force required to maintain a constant speed of a moving object on a horizontal surface is equal to: (a) Its weight (b) The frictional force acting on it (c) The net force acting on it (d) Its inertia
सही उत्तर: क) (a) Its weight
Option (c) is correct. According to Newton's First Law of Motion, an object moving at a constant speed in a straight line experiences no net force. Therefore, the required force must be the net force. Options (a), (b), and (d) are incorrect as they relate to different concepts.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The refractive index of a glass slab is 1.5. If light travels through it from air to glass, what is the angle of minimum deviation?
सही उत्तर: ग) 60°
The angle of minimum deviation (δ) for a single immersion lens is given by δ = sin((A + δ')/2), where A is the angle of incidence and δ' is the angle of refraction. In this case, A=0, so δ = sin(δ'/2). The minimum deviation occurs when δ'=90°, thus δ = sin(45°) = 1/√2 ≈ 0.707 radians, which converts to approximately 41 degrees. The option closest to this value is 45°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car travels 100 meters in 10 seconds. What is its average speed in m/s?
सही उत्तर: क) 10 m/s
Average speed is calculated by dividing the total distance traveled by the time taken: Average Speed = Distance / Time = 100 meters / 10 seconds = 10 m/s. The incorrect options are values that don’t follow this simple calculation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball rolls down a ramp of length L with an acceleration of 'a'. If the ramp were twice as long, what would be the new acceleration?
सही उत्तर: क) 2a
The acceleration due to gravity is constant and it's only acting along the ramp. The relevant physics equation is a = g*sin(θ), where θ is the angle of inclination. Since L is proportional to sin(θ) (assuming an incline), doubling L will double the value of sin(θ). Therefore, if we keep 'g' constant, doubling L will also double 'a'. The other options don’t account for this relationship between length and sine of the angle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wave has a wavelength of 1.5 meters and a frequency of 300 Hz. What is its speed?
सही उत्तर: ख) 900 m/s
Wave speed (v) can be calculated using the formula v = fλ, where f is frequency and λ is wavelength. Therefore, v = 300 Hz * 1.5 meters = 450 m/s. The most misleading option is 900m/s as it suggests a higher frequency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The refractive index of a medium is defined as the ratio of:
सही उत्तर: ख) Speed of light in vacuum to speed of light in the medium
Refractive index (n) is the ratio of the speed of light in a vacuum (c) to the speed of light in the given medium (v): n = c/v. This definition is fundamental to optics. The other options represent entirely different physical quantities.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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