Physics Physics of Solids MCQs Chapter 6 Class 12 - PLS Academy

Physics of Solids MCQs Chapter 6 Class 12

Physics of Solids is an important chapter of Class 12 Physics and is highly relevant for free preparations for entry tests and FSC Part-II exams. It is frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and FSC board examinations. This chapter covers essential topics such as crystalline and amorphous solids, unit cell, density of crystals, packing efficiency, and mechanical properties of solids. Many students use entry test MCQs and practice tests to reinforce these concepts effectively.

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Created on February 07, 2022 By Ali Durrani

Physics Ch 17 Class 12 Physics of Solids

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1 / 35

When an applied stress changes the volume, the change in volume per unit volume is known as:

FMDC 2018
Physics
Physics of Solids
Elimination Tool:

A) Polymetric strain

B) Crystalline strain

C) Volumetric strain

D) Equal strain

2 / 35

The young’s modulus of a given rod of uniform length ? is given by the relation:

ETEA 2018
Physics
Physics of Solids
Elimination Tool:

A) ??/?

B) ??/L

C) F?/??2?

D) F?/??2L

3 / 35

Which of the following statements is correct:

UHS 2011
Physics
Physics of Solids
Elimination Tool:

A) Elasticity is that property of body which enables body to regain its original dimension

B) Elasticity is that property of a body that does not allow it to return to its original shape

C) Elasticity is that property of a body that allows it to retain its original shape and dimension after the stress is removed.

D) Elasticity is that property of a body that obeys Hooke’s law.

4 / 35

To determine Young’s modulus of a material of a given wire of length ? we use:

ETEA 2018
Physics
Physics of Solids
Elimination Tool:

A) Melde’s Apparatus

B) Young’s Apparatus

C) Searle’s Apparatus

D) Cavendish Apparatus

5 / 35

A wire of area of cross section ‘A’ and original length ‘l’ is subjected to a load
‘L’. A second wire of the same material with an area is ‘2A’ and length ‘2l’ is
subjected to the same load ‘L’. If the extension in the first wire is ‘X’ and the second
wire is ‘Y’, find the ratio ‘X/Y’.

UHS 2015
Physics
Physics of Solids
Elimination Tool:

A) 14

B) 12

C) 11

D) 21

6 / 35

When a fluid is incompressible, it means:

FMDC 2018
Physics
Physics of Solids
Elimination Tool:

A) No internal frictional force

B) Independent of coordinates

C) Independent of time

D) Its density remains constant

7 / 35

Negative strain indicates that

Length is increased

length is decreased

Length remains same

None of these

8 / 35

A 4.0 m long wire is subjected to stretching force and its length increases by 40 cm. The percent elongation which the wire undergoes is:

UHS 2013
Physics
Physics of Solids
Elimination Tool:

A) 0.10 %

B) 40 %

C) 10 %

D) 20 %

9 / 35

The product of dimensions of Young’s modulus and stress are:

NUMS 2017
Physics
Physics of Solids
Elimination Tool:

A) [ML2T-1]

B) [ML-1T2]

C) [ML-1T-2]

D) [ML2T-3]

10 / 35

The volume of a gas at constant pressure increases by 2% when the temperature is increased by 5 K, It’s initial temperature is:

NUMS 2016
Physics
Physics of Solids
Elimination Tool:

A) 100 K

B) 250 K

C) 500 K

D) 1000 K

11 / 35

The process of adding controlled impurities to a semiconductor is known as _______. The amount of impurity added to an intrinsic (pure) semiconductor varies its level of conductivity.

NTS 2018
Physics
Physics of Solids
Elimination Tool:

A) Crystallography

B) Rectification

C) Intrinsic defects

D) Doping

12 / 35

Let L be the length and d be the diameter of the cross section of a wire. Wires of the same material with different L and d are subjected to the same tension along the length of the wire. In which of the following cases the extension of wire will be the maximum?

NUMS 2019 Cancelled
Physics
Physics of Solids
Elimination Tool:

A) L = 200 cm, d = 0.5 mm

B) L=300cm, 1.0 mm

C) L=50cm, d=0.05mm

D) L- 100 cm, d=0.2mm

13 / 35

Aluminum Is a

Metal

Non Metal

Photo conductor

Semiconductor

14 / 35

If stress is applied on a body then the ratio of change in volume to original volume will be:

NUMS 2016
Physics
Physics of Solids
Elimination Tool:

A) Polymeric strain

B) Volumetric strain

C) Parallel strain

D) Tensile strain

15 / 35

One of the following is a photoconductor :

PMC Practice 20
Physics
Physics of Solids
Elimination Tool:

A) Silver

B) Gold

C) Selenium

D) Mercury

16 / 35

Which of the following can have negative temperature coefficient?

PMC Practice 4
Physics
Physics of Solids
Elimination Tool:

A) Compounds of silver

B) Liquid metals

C) Metallic alloys

D) Electrolytes

17 / 35

Dimension of modulus of elasticity:

ML^-1T^-2

ML^-3T

ML^0T^1

M^-2L^-2T^-1

18 / 35

When an applied stress changes the volume, the change in volume per unit volume is known as:

NUMS 2018
Physics
Physics of Solids
Elimination Tool:

A) Polymetric strain

B) Crystalline strain

C) Volumetric strain

D) Equal strain

19 / 35

Which type of current passes through extrinsic semiconductors diode?

Unidirectional

Bidirectional

Both a and b

None of these

20 / 35

The stress-strain graph, deduced the following limits successively:

UHS 2013
Physics
Physics of Solids
Elimination Tool:

A) Proportional limit, yield limit, elastic limit

B) Yield limit, elastic limit, proportional limit

C) Proportional limit, elastic limit, yield limit

D) Elastic limit, proportional limit, yield limit

21 / 35

A wire is stretched by a force which causes an extension. The energy is stored in it only when:

UHS 2011
Physics
Physics of Solids
Elimination Tool:

A) The extension of wire is proportional to force applied

B) The cross-section area of the wire remains constant

C) The wire is not stretched beyond its elastic limit

D) The weight of wire is negligible

22 / 35

Pascal is equal to:

Newton meter squared

Newton per meter squared

Newton meter cubed

Newton per meter cubed

23 / 35

NUMS 2014
Physics
Physics of Solids
Elimination Tool:

A) L = 200 cm, d = 0.5 mm

B) L=300cm, 1.0 mm

C) L=50cm, d=0.05mm

D) L- 100 cm, d=0.2mm

24 / 35

Strain energy in a deformed energy is stored in the form of:

UHS 2015
Physics
Physics of Solids
Elimination Tool:

A) Elastic Energy

B) Potential Energy

C) Plastic Energy

D) Kinetic Energy

25 / 35

To convert the Si crystal into a P. type semi-conductor, which group element be Doped?

NUMS 2016
Physics
Physics of Solids
Elimination Tool:

A) Trivalent element

B) Four group element

C) Second group element

D) Pentavalent element

26 / 35

The ratio of tensile strength to tensile strain is called:

UHS 2012
Physics
Physics of Solids
Elimination Tool:

A) Modulus of elasticity

B) Bulk Modulus

C) Young’s Modulus

D) Shear Modulus

27 / 35

Electric conduction is high in:

NUMS 2016
Physics
Physics of Solids
Elimination Tool:

A) Solid nuclei

B) Sugar solution

C) Solid graphite

D) None

28 / 35

A wire is stretched by a force ‘F’ which causes an extension ∆l, the energy stored in the wire is:

UHS 2012
Physics
Physics of Solids
Elimination Tool:

A) F∆l

B) 2F∆l

C) ½ F∆l2

D) ½ F∆l

29 / 35

Semiconductors have conductivity of the order

10^7

10^-10 to 10^-20

10^-6 to 10^-4

None

30 / 35

In an extrinsic semi-conductor charge carriers are

Holes

electron

No charge carriers

Both a and b

31 / 35

Hooke’s law states that under normal conditions:

NUMS 2019 Cancelled
Physics
Physics of Solids
Elimination Tool:

A) Stress is inversely proportional to strain till elastic limit

B) Strain is directly proportional to strain till elastic limit

C) Stress is independent of strain

D) Stress is proportional to elastic modulus

32 / 35

Young modulus for the perfectly rigid body is

Infinity

33 / 35

If stress is doubled, then volume becomes

Double

Half

Four times

None of these

34 / 35

If a substance can undergo plastic deformation, until it breaks, it is:

NUMS 2016
Physics
Physics of Solids
Elimination Tool:

A) Ductile substance

B) Brittle substance

C) Crystalline substance

D) Polymeric substance

35 / 35

In the case of linear deformation, the ratio of tensile stress to tensile strain is called:

UHS 2018
Physics
Physics of Solids
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Energy stored in a stretched wire

B) Young’s double slit phenomenon

C) Bulk Modulus

D) Young’s Modulus

Your score is

The average score is 59%

Importance of Physics of Solids MCQs

Understanding Physics of Solids helps students analyze crystal structures and solve numerical problems based on lattice arrangements. Moreover, exam questions often test formula application, unit calculations, and conceptual clarity. Regular practice of topic-wise MCQs and short tests improves accuracy, speed, and confidence. Therefore, consistent practice is key to excelling in competitive exams.

Effective Strategy for Free Preparations

For best results, students should revise formulas, study diagrams carefully, and solve chapter-wise MCQs. In addition, attempting free tests and past papers helps identify frequently asked questions and repeated patterns. PLS Academy provides structured resources that support free entry test preparations for Physics of Solids and other Class 12 Physics chapters.

JazakAllah.