CUET · PHYSICS · PYQ PAPER 2023
The resistivity of an iron wire is \( 10 \times 10^{-8} \, \Omega \text{ m} \). The resistance of an iron wire is \( 5 \, \Omega \). If its length as well as thickness is doubled then its resistivity will be :
- A \( 10 \times 10^{-8} \, \Omega \text{ m} \)
- B \( 20 \times 10^{-8} \, \Omega \text{ m} \)
- C \( 5 \times 10^{-8} \, \Omega \text{ m} \)
- D \( 40 \times 10^{-8} \, \Omega \text{ m} \)
Answer & Solution
Correct Answer
(A) \( 10 \times 10^{-8} \, \Omega \text{ m} \)
Step-by-step Solution
Detailed explanation
Resistivity is an intrinsic property of the material. It does not change with dimensions. Resistivity = \( 10 \times 10^{-8} \, \Omega \text{ m} \)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- A proton is moving in a circular path in a magnetic field perpendicular to its plane. It possesses kinetic energy E. If the magnetic field increases to four times and the proton moves in same circular path, what will be kinetic energy?CUET 2023 Easy
- Speed of Electromagnetic wave is not the same :CUET 2023 Easy
- The expression of the magnetic energy stored in a solenoid in terms of magnetic field B, cross-sectional area A and length l of the solenoid, is:CUET 2025 Medium
- When a capacitor is subjected to a D.C. source it takes small time internal to get fully charged up. During this small time interval there is no passage of charge through dielectric, yet we use a term - displacement current. This term is used because :CUET 2023 Hard
- The physical quantity which does not change when X-rays of wavelength \( 10^{-10} \, \text{m} \), or visible light of wavelength 400 nm, or radio waves of 500 m wavelength pass through glass isCUET 2025 Hard
- A short bar magnet of magnetic moment \(m =0.45 J / T\) is placed in a uniform magnetic field of 0.22 T . If the bar is free to rotate in the plane of the field, what is the potential energy of the magnet in stable and unstable equilibrium respectively?CUET 2023 Easy
More PYQs from CUET
- Match List I with List II
LIST I (Drugs) LIST II (Obtained from) A. Heroin I. Tobacco plant B. Cannabinoids II. Erythroxylum coca C. Cocaine III. Cannabis sativa D. Nicotine IV. Papaver somniferum
Choose the correct answer from the options given below:CUET 2023 Medium - The osmotic pressure of the equimolar solutions of the following at the same temperature will increase in the order:
(A) NaCl
(B) \(K_{2}SO_{4}\)
(C) \(K_{3}[Fe(CN)_{6}]\)
(D) \(NH_{2}CONH_{2}\)
Choose the correct answer from the options given below:CUET 2025 Medium - Match List I with List II
LIST-I LIST-II A. Polariser I. Myopia B. Convex lens II. Communication C. Concave lens III. Simple Microscope D. Optical fibre IV. Sunglasses
Choose the correct answer from the options given below:CUET 2023 Easy - The slope of tangent to the curve \(x=t^2+3 t-8, y=2 t^2-2 t-5\) at the point (2, -1) is:CUET 2023 Hard
- Match List I with List II
LIST I LIST II A. \(\int \sin x \cos x d x\) I. \(\log _e\left(1+\sin ^2 x\right)+C\) B. \(\int \frac{d x}{\sin ^2 x \cos ^2 x}\) II. \(\tan \frac{x}{2}+C\) C. \(\int \frac{\sin 2 x}{1+\sin ^2 x} d x\) III. \(-\frac{1}{4} \cos 2 x+C\) D. \(\int(1-\cos x)\operatorname{cosec}^2 x d x\) IV. \(\tan x-\cot x+C\) CUET 2023 Hard - Three resistors of resistance \(15 \Omega\) each are to be connected in combination. The ratio of maximum equivalent resistance to the minimum equivalent resistance is :CUET 2025 Hard