Physics Physics of Solids MCQs Chapter 6 Class 12

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

Pascal is equal to:

Newton meter squared

Newton per meter squared

Newton meter cubed

Newton per meter cubed

3 / 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

4 / 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

5 / 35

Aluminum Is a

Metal

Non Metal

Photo conductor

Semiconductor

6 / 35

Young modulus for the perfectly rigid body is

1

0

Infinity

40

7 / 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 %

8 / 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

9 / 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

10 / 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

11 / 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

12 / 35

Semiconductors have conductivity of the order

10^7

10^-10 to 10^-20

10^-6 to 10^-4

None

13 / 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

14 / 35

Dimension of modulus of elasticity:

ML^-1T^-2

ML^-3T

ML^0T^1

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

15 / 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 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

16 / 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

17 / 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]

18 / 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

19 / 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.

20 / 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

21 / 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

22 / 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

23 / 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

24 / 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

25 / 35

In an extrinsic semi-conductor charge carriers are

Holes

electron

No charge carriers

Both a and b

26 / 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

27 / 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

28 / 35

If stress is doubled, then volume becomes

Double

Half

Four times

None of these

29 / 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

30 / 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

31 / 35

Negative strain indicates that

Length is increased

length is decreased

Length remains same

None of these

32 / 35

Which type of current passes through extrinsic semiconductors diode?

Unidirectional

Bidirectional

Both a and b

None of these

33 / 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

34 / 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

35 / 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

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Physics Physics of Solids MCQs Chapter 6 Class 12

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