Test: Factors Affecting Resistivity (December 3) - NEET MCQ

# Test: Factors Affecting Resistivity (December 3) - NEET MCQ

Test Description

## 10 Questions MCQ Test Daily Test for NEET Preparation - Test: Factors Affecting Resistivity (December 3)

Test: Factors Affecting Resistivity (December 3) for NEET 2024 is part of Daily Test for NEET Preparation preparation. The Test: Factors Affecting Resistivity (December 3) questions and answers have been prepared according to the NEET exam syllabus.The Test: Factors Affecting Resistivity (December 3) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Factors Affecting Resistivity (December 3) below.
Solutions of Test: Factors Affecting Resistivity (December 3) questions in English are available as part of our Daily Test for NEET Preparation for NEET & Test: Factors Affecting Resistivity (December 3) solutions in Hindi for Daily Test for NEET Preparation course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Test: Factors Affecting Resistivity (December 3) | 10 questions in 20 minutes | Mock test for NEET preparation | Free important questions MCQ to study Daily Test for NEET Preparation for NEET Exam | Download free PDF with solutions
Test: Factors Affecting Resistivity (December 3) - Question 1

### Range of resistivity for metals is

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 1

The typical range of resistivity for metals is from 10−8Ωm to 10−6Ωm

Test: Factors Affecting Resistivity (December 3) - Question 2

### The resistance of a heating element is 99Ω at room temperature. What is the temperature of the element if the resistance is found to be 116Ω? (Temperature coefficient of the material of the resistor is 1.7 × 10−4∘C−1)

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 2

Here, R0 = 99Ω, T0 = 27C
RT = 116Ω;
α = 1.710−4∘C−1
∴ R= R[1 + α(T − T0)]
∴ RTR− 1 = α(T − T0)
⇒ 11699 − 1= α(T − T0)

⇒ T = 1010.1 + T0 = 1010.1 + 27

= 1037.1C

 1 Crore+ students have signed up on EduRev. Have you?
Test: Factors Affecting Resistivity (December 3) - Question 3

### The resistance of wire in a heater at room temperature is 65Ω. When the heater is connected to a 220V supply the current settles after a few seconds to 2.8A. What is the steady temperature of the wire. (Temperature coefficient of resistance α = 1.70 × 10−4∘C−1)

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 3

Here, T1 = 27C, R1 = 65Ω
R2
= Supply voltage / Steady current
= 220 / 2.8
= 78.6Ω
Now, using the relation
R2 = R1[1 + α(T2 − T1)]
∴

T2 − T1 = 1231
T2 = 1231 + T1 = 1231 + 27
= 1258C

Test: Factors Affecting Resistivity (December 3) - Question 4

The resistivity of alloy manganin is

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 4

Metals, including alloys, have free electrons as charge carriers. Their movement controls by defects. One of defects of usual metal is oscillations of atoms due to temperature. More temperature - more oscillations - more collisions of electrons with atoms - less mobility - more resistivity. In alloys, like constantan, atoms are in disorder so alloys have big resistivity. Their additional disorder due to temperature increase is insignificant. That is why alloys have no temperature dependence of resistivity. The same picture is with metal glasses.

Test: Factors Affecting Resistivity (December 3) - Question 5

Figure (a) and figure (b) both are showing the variation of resistivity (p) with temperature (T) for some materials. Identify the types of these materials.

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 5

In conductors due to increasein temperature the resistivity increases and in semiconductors if the decreases exponentially.

Test: Factors Affecting Resistivity (December 3) - Question 6

A wire has a resistance of 2.5Ω at 28C and a resistance of 2.9Ω at 100C. The temperature coefficient of resistivity of material of the wire is

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 6

Here, R1 = 2.5Ω, T1 = 28C
R2 = 2.9Ω and T= 100C
As R2 = R1[1 + α(T2 − T1)]
∴ 2.9 = 2.5[1 + α(100 − 28)]

= 2.22 × 10−3∘C−1

Test: Factors Affecting Resistivity (December 3) - Question 7

The resistance of the wire in the platinum resistance thermometer at ice point is 5Ω and at steam point is 5.25Ω. When the thermometer is inserted in an unknown hot bath its resistance is found to be 5.5Ω. The temperature of the hot bath is

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 7

Here,R0 = 5Ω, R100 = 5.25Ω, Rt = 5.5Ω
As,R1 = R0(1 + αt)
∴R100 = R0(1 + α100)

Equation (i) and (ii), we get

= 200oC

Test: Factors Affecting Resistivity (December 3) - Question 8

Arrange the following materials in increasing order of their resistivity,
Nichrome, Copper, Germanium, Silicon

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 8

Test: Factors Affecting Resistivity (December 3) - Question 9

What is the order of magnitude of the resistance of a dry human body?

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 9

Human body has different resistances, when dry, resistance is 100,000 ohms. When wet because of sweat or water, resistance is only 1,000 ohms.

Test: Factors Affecting Resistivity (December 3) - Question 10

Wire wound resistors are made by

Detailed Solution for Test: Factors Affecting Resistivity (December 3) - Question 10

Wire bound resistors are made by winding the wires of an alloy, viz. manganin, constantan, nichrome etc. The choice of these materials is dictated mostly by the fact that their resistivities are relatively insensitive to temperature. These resistances are typically in range of a fraction of an ohm to a few hundred ohms.

## Daily Test for NEET Preparation

12 docs|366 tests
Information about Test: Factors Affecting Resistivity (December 3) Page
In this test you can find the Exam questions for Test: Factors Affecting Resistivity (December 3) solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Factors Affecting Resistivity (December 3), EduRev gives you an ample number of Online tests for practice

## Daily Test for NEET Preparation

12 docs|366 tests