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Class 11 NEB model question solution 2077 | Physics | Complete explanation and notes

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Model Question Solution Group 'A' 1. A metre rule is used to measure the length of a piece of string in a certain experiment. It is found to be 20 cm long to the nearest millimeter. How should this result be recorded in a table of results? (a) 0.2000 m (b) 0.200 m (c) 0.20 m (d) 0.2 m Explanation: From the question, it is obvious that the least count of the metre scale is 1 mm as it measures upto the millimeter. Since, 1 mm = 0.001 m . So, result should have three significant figures. Thus, \[\begin{align*} 20 cm &= \frac{20}{100}\\ \therefore 20 cm &=0.200 \hspace{0.01cm} m\\ \end{align*}\] 2. Forces are applied to a rigid body. The forces all act in the same plane. In which diagram is the body in equilibrium? (b) Explanation: In this case, the downward force has balanced the upward force and hence the body is in equilibrium. 3. An athlete makes a long jump a...
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Simple Pendulum Simulation | Class 11 and Class 12 NEB Physics | Physics in Depth

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Simple Pendulum Simulation Explore how length & temperature affect the period of oscillation Parameters Pendulum Length 1.00 m Temperature 25 °C Initial Angle 15° Live Measurements Period T 2.00 s Frequency 0.50 Hz Eff. Length 1.000 m Δ Length +0.000 m Physics T = 2π √(L / g) L eff = L₀ (1 + α·ΔT) α (steel) = 12×10⁻⁶ /°C ·   g = 9.81 m/s² Controls ⏸ Pause ...
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Action at Points | Class 11 NEB Physics | Physics in Depth

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Action at Points | Class 11 NEB Physics | Physics in Depth Action at Points: Action at points refers to the phenomenon where a charged pointed end of a conductor ionizes the surrounding air causing a continuous leakage of charge from that point. Mechanism: For any charged conductor, the electric charge distributes itself on the outer surface. For a pointed end, the surface charge density (\(\sigma\), charge per unit area) is inversely proportional to the radius of curvature (\(r\)) of that surface:\[\sigma \propto \frac{1}{r}\] The electric field \(E\) is proportional to \(\sigma\). So, the two case may arise: Case I: The electric field if immensely greater may ionize the air molecules directly stripping the electrons from it (air molecules then becomes positively charged). Case II: The higher electric field intensity due to the pointed end may ...
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Electric Charges | Class 11 NEB Physics | Complete notes | Numerical Problems and Solutions

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Electric Charges & Electrostatics - Class 11 Physics Electric Charges Electrostatics , the earliest discovered branch of electricity, involves electric charges, the forces between them, and their behavior in materials. Just as masses are responsible for gravitational forces, electric charges are the fundamental property responsible for electrical forces. Matter is made up of atoms. Inside every atom, positive and negative charges are held together by the enormous attraction of the electrical force. Protons carry a positive charge, while electrons carry a negative charge. Protons are bound tightly inside the nucleus of an atom and are not mobile, unlike the tinier electrons ( electrons do all sorts of useful things! ). Bohr model of an atom (Class 11) Concentric circular orbits around a central nucleus. Three shells labelled K, L, M contain 2, 8, and 8 electrons respectively. Protons are shown as red circles and neutrons as grey circles inside ...
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