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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When a source of sound moves towards a stationary listener, the frequency heard by the listener:
सही उत्तर: ख) is higher than the actual frequency
By the Doppler effect, the waves are crowded together, so the apparent frequency increases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat needed to melt 2 kg of ice at 0 °C into water at 0 °C is (latent heat of fusion = 3.36 × 10⁵ J/kg):
सही उत्तर: घ) 6.72 × 10⁵ J
Q = mL = 2 × 3.36 × 10⁵ = 6.72 × 10⁵ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Young's modulus of a material is the ratio of:
सही उत्तर: घ) longitudinal stress to longitudinal strain
Y = (F/A)/(ΔL/L); bulk modulus uses volume, rigidity modulus uses shear, and Poisson's ratio is lateral/longitudinal strain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the length of a simple pendulum is made four times, its time period becomes:
सही उत्तर: ग) twice
T = 2π√(l/g) ∝ √l, so T becomes √4 = 2 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A force of 20 N is applied perpendicular to a spanner at a distance of 0.5 m from the bolt. The torque is:
सही उत्तर: ख) 10 N m
τ = rF sin 90° = 0.5 × 20 = 10 N m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Roads are banked at curves mainly to:
सही उत्तर: ख) provide the necessary centripetal force without depending on friction
On a banked road, a component of the normal reaction supplies the centripetal force needed for turning.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A horizontal rope pulls a box 10 m along the floor with a force of 50 N directed at 37° above the horizontal (cos 37° = 0.8). The work done by the force is:
सही उत्तर: क) 400 J
W = Fs cos θ = 50 × 10 × 0.8 = 400 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Impulse acting on a body is equal to its:
सही उत्तर: ख) change in momentum
Impulse = F × Δt = Δp (impulse–momentum theorem); the rate of change of momentum is force.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The slope of a velocity–time graph gives:
सही उत्तर: घ) acceleration
Slope = change in velocity / time = acceleration; the area under the graph gives displacement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An astronaut in an orbiting satellite feels weightless because:
सही उत्तर: ग) Both the astronaut and the satellite are in free fall
Gravity at orbital heights is still strong; it provides the centripetal force. Since astronaut and satellite fall together, there is no normal reaction, so weight is not felt.
💬 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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