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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The ability of the eye to focus on both near and distant objects by changing the focal length of its lens is called:
सही उत्तर: ख) accommodation
The ciliary muscles change the curvature of the eye lens, adjusting its focal length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A red rose is seen in pure green light. It appears:
सही उत्तर: घ) black
The rose reflects only red light; with no red in the incident light, it reflects almost nothing and looks black.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When red light and green light are mixed in equal intensity, the colour seen is:
सही उत्तर: क) yellow
Red + green = yellow in additive colour mixing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary colours of light are:
सही उत्तर: ख) red, green and blue
Mixing red, green and blue light in suitable proportions gives all other colours, including white.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Sun is seen a little before it actually rises above the horizon because of:
सही उत्तर: ग) atmospheric refraction
Light bends as it passes through the denser lower atmosphere, raising the Sun's apparent position (about 2 minutes earlier sunrise).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Stars appear to twinkle mainly because of:
सही उत्तर: ख) atmospheric refraction of their light
Starlight passes through layers of air of changing refractive index, so its apparent position and brightness keep fluctuating.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The power of a concave lens of focal length 25 cm is:
सही उत्तर: घ) −4 D
P = 1/f (in metres) = 1/(−0.25) = −4 D; a concave lens has negative power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Convex mirrors are used as rear-view mirrors in vehicles because they:
सही उत्तर: क) give a wider field of view with erect images
A convex mirror always gives an erect, diminished image and covers a wide area behind the vehicle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The image formed by a plane mirror is:
सही उत्तर: ख) virtual, erect, of the same size and laterally inverted
A plane mirror forms a virtual, upright, same-size image as far behind the mirror as the object is in front, with left and right interchanged.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ship's SONAR receives the echo from the sea bed 2 s after sending an ultrasonic pulse. If sound travels at 1500 m/s in sea water, the depth of the sea is:
सही उत्तर: ख) 1500 m
The pulse travels down and back, so depth = vt/2 = 1500 × 2 / 2 = 1500 m.
💬 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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