NEET Previous Year Questions (2014-20): Mechanical Properties of Solids Notes | Study Physics Class 11 - NEET

Q.1. Dimensions of stress are :     [2020]
A: [ML⁰T^–2]
B: [ML^–1T^–2]
C: [MLT^–2]
D: [ML²T^–2]
Ans: B


Q.2. A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L₁ when mass M is suspended from its free end. The expression for Young's modulus is :     [2020]
A:

B:

C:

D:

Ans: B
from young’s modulus formula


Q.3. When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is:    [2019]
A: Mgl
B: MgL
C:
D:
Ans: C
Solution:

U = 1/2 ((work done by gravity)

Q.4. Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount ?    [2018]
A: 9F
B: 6F
C: 4F
D: F
Ans: A
Solution:


Q.5. The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'p', the fractional decrease in radius is:-    [2017]
A:
B:
C:
D:
Ans: C
Solution:


Q.6. Copper of fixed volume ‘V’ is drawn into wire of length ‘l’. When this wire is subjected to a constant force ‘F’, the extension produced in the wire is ‘Δl’. Which of the following graphs is straight line?    [2014]
A: Δl versus l/l²
B: Δl versus l
C: Δl versus l/l
D: Δl versus l²
Ans: D
Solution:

There is no Question for NEET 2021