NEET 2023 Phase 2 · PhysicsResistivityPrevious Year Question
On the basis of electrical conductivity, which one of the following materials has the smallest resistivity?
Answer: (D) Silver. \textbf{Answer:} (4) Silver \textbf{Solution:} Resistivity is inverse to conductivity.
- A.Glass
- B.Silicon
- C.Germanium
- D.Silver✓
Correct Answer
(D) Silver
Solution & Explanation
\textbf{Answer:} (4) Silver \textbf{Solution:} Resistivity is inverse to conductivity. Silver (a metal) has the highest conductivity smallest resistivity; Si/Ge are semiconductors, glass an insulator.
🎯
43,000+ questions in हिंदी & English · one-tap toggle
Open →📚Practice all NEET Physics PYQs chapter-wise →💡Don't get it? Learn the Current Electricity concepts →Practice NEET 2023 Phase 2 Physics — free, with instant solutions
43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.
More NEET PYQ solutions
PhysResistance of a carbon resistor from colour codes is (22000 ± 5%) . The colour of the third band must be:PhysA carbon resistor of (47 ± 4.7) k is to be marked with rings of different colours for its identification. The colour code sequence will be:PhysAn electric dipole with dipole moment 5 × 10⁻⁶ C·m is aligned with the direction of a uniform electric field of magnitude 4 × 10⁵ N/C. The dipole is then rotated through an angle of 60° with respect to the electric field. The change in the potential energy of the dipole is:PhysTwo identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (radii negligible vs separation, treated as point charges) is best given as:PhysThe plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant K1 and K2 with thickness 3d/8 and d/2 respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If K1/K2 = 1.25, the value of K1 is:PhysA sphere of radius R is carved out of a uniform solid sphere of radius 2R (internally tangent, so its centre is at distance R from the big centre). The ratio of the moment of inertia of the small sphere to that of the remaining part, both about the Y-axis through the big sphere's centre, is:PhysThe Sun rotates once in 27 days. If it expanded to twice its present radius (uniform-density sphere, no external influence), its new period would be about:PhysA uniform rod of mass 20 kg and length 5 m leans against a smooth vertical wall, making 60° with the wall; its lower end rests on a rough horizontal floor. The friction force exerted by the floor is: (g = 10 m/s²)