विज्ञान – Science MCQ
विज्ञान – डिप्लोमा प्रवेश
Science · CTEVT Diploma Engineering Entrance · ३९५ प्रश्न
३९५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
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
-
The ratio of load to effort in a simple machine is called:
सही उत्तर: क) Mechanical advantage
Mechanical advantage (MA) = load ÷ effort. Velocity ratio is effort distance ÷ load distance, and efficiency = MA/VR × 100%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Which simple machine is a pair of scissors?
सही उत्तर: घ) First-class lever
In scissors the fulcrum (the pivot) lies between the effort and the load, which defines a first-class lever. A nutcracker is a second-class lever, with the load between fulcrum and effort.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A body floats in a liquid when:
सही उत्तर: ग) Its density is less than that of the liquid
If a body's density is less than the liquid's, the upthrust can balance its weight before it is fully submerged, so it floats. A body denser than the liquid sinks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The upward force exerted by a fluid on a body immersed in it is called:
सही उत्तर: ख) Upthrust (buoyant force)
According to Archimedes' principle, the upthrust equals the weight of fluid displaced. Viscosity is the internal friction of a fluid, not an upward force.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Atmospheric pressure is measured by a:
सही उत्तर: क) Barometer
A barometer measures atmospheric pressure; standard atmospheric pressure is about 76 cm of mercury. A hydrometer measures the density or relative density of liquids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Pascal's law is the working principle of:
सही उत्तर: घ) Hydraulic press
Pascal's law states that pressure applied to an enclosed liquid is transmitted equally in all directions, which a hydraulic press uses to multiply force. A barometer measures atmospheric pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The weight of a body is maximum at:
सही उत्तर: ग) The poles
g is greatest at the poles because the Earth's radius is smallest there, so weight is maximum. At the centre of the Earth, g and therefore weight become zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The universal gravitational constant G has the value approximately:
सही उत्तर: ख) 6.67 × 10⁻¹¹ N m²/kg²
G ≈ 6.67 × 10⁻¹¹ N m²/kg² and is the same everywhere in the universe. 9.8 m/s² is g, the acceleration due to gravity, which varies from place to place.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The mass of a body on the Moon compared with its mass on the Earth is:
सही उत्तर: क) The same
Mass is the quantity of matter and does not change with location. Weight, not mass, becomes about one-sixth on the Moon.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The value of acceleration due to gravity on the Moon is about what fraction of that on the Earth?
सही उत्तर: घ) One-sixth
Because of its smaller mass and radius, the Moon's surface gravity is about 1/6 of Earth's (about 1.6 m/s²). This is why objects weigh about one-sixth as much on the Moon.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।