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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Which radioactive isotope is commonly used as a tracer to study the uptake of phosphate fertiliser by plants?
सही उत्तर: क) Phosphorus-32
³²P is a beta emitter whose path through soil and plants can be followed; ¹³¹I is used for the thyroid and ¹⁴C for dating.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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X-rays are used to photograph bones because they:
सही उत्तर: क) pass through soft tissue but are absorbed more by bone
Bone, containing heavier elements like calcium, absorbs X-rays strongly, leaving a shadow on the film.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One volt is equal to:
सही उत्तर: ख) one joule per coulomb
Potential difference = work done per unit charge; 1 V = 1 J/C (1 C/s is an ampere and 1 J/s is a watt).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A glass rod rubbed with silk becomes:
सही उत्तर: घ) positively charged, because it loses electrons
Electrons transfer from glass to silk, leaving the glass with a deficit of electrons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Earth's geographic north pole lies near its:
सही उत्तर: क) magnetic south pole
The north-seeking pole of a compass is attracted towards the geographic north, so a magnetic south pole must lie there.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric generator (dynamo) works on the principle of:
सही उत्तर: ख) electromagnetic induction
Rotating a coil in a magnetic field changes the flux through it and induces an emf.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Fleming's left-hand rule gives the direction of the:
सही उत्तर: ख) force on a current-carrying conductor in a magnetic field
The left-hand rule is used for motors; the right-hand rule gives the direction of induced current in generators.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 60 W bulb is used for 5 hours a day for 30 days. The electrical energy consumed is:
सही उत्तर: ग) 9 kWh
E = 0.06 kW × 5 h × 30 = 9 kWh (9 units).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two bulbs rated 40 W, 220 V and 60 W, 220 V are connected in parallel across a 220 V supply. Which glows brighter?
सही उत्तर: क) The 60 W bulb
In parallel each bulb gets its rated 220 V and dissipates its rated power, so the 60 W bulb is brighter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 2 Ω and 4 Ω are connected in parallel to a battery. The ratio of heat produced per second in the 2 Ω and 4 Ω resistors is:
सही उत्तर: ग) 2 : 1
In parallel V is the same, so H = V²t/R ∝ 1/R; H₂ : H₄ = 4 : 2 = 2 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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