12th Standard CBSE Syllabus & Materials

12th Standard CBSE

CBSE 12th Economics Government Budget and the Economy Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Interface Python with MySQL - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Database Concept - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Data Communication - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Data Structures - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Functions - New Previous year Question Papers Study Material - QB365 Set A

CBSE 12th Standard Physics Subject Current Electricity HOT Questions 1 Mark Questions 2021

Published on: 27/05/2021

QB365 Provides the HOT Question Papers for Class 12 Physics, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics

Questions + Answers key

Take MCQ Physics Test

QB365 Student Learing Managemnet System

Std: 12th Standard CBSE - Physics

chapter: - HOT Questions

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 2

5 x 2 = 10

Two wire of equal length one copper and manganin have same resistance , which wire is thicker?

You are given 8 $\Omega $ resistor. What length of wire of resistance 120 Ωm-1 should be joined in parallel with it to get a value of 6 $\Omega $ ?

A 10Ω thick wire is stretched so that its length becomes three times. Assuming that there is no change in its density on stretching. Calculate the resistance of new wire

If p.d.v applied across a conductor is increased to 2v, how will the draft velocity of the electrons change?

In an experiment of meter bridge, the balancing length of the wire is l. What would be its value, if the radius of the meter bridge wire is double? Justify your answer.

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 2

5 x 2 = 10

Resistivity of Copper is less, hence mangain wire is thicker

Now, 1/R = 1R₁+ 1R₂
Because 1 = 48/240 = 0.2 m

$\mathrm{R}=\rho(1 / \mathrm{A})$
$ =\rho\left(1^2 / \mathrm{A} 1\right) \\ =\rho 12 / \mathrm{V} $
Since $\rho$ and V are constans therefore
$\rightarrow\left(R_2 / R_1\right)=\left(12 / l_1\right)^2=9$
Because R₂ = 9R₁
$=9 \times 10=90 \Omega$

As Vd $α$ V
The different velocity will be doubled

The balancing length remains same as per relation.
$\frac{R}{S}=\frac{l}{100-l}$
The balancing length is independent of radius bridge wire provided that it is uniform throughout.