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 a straight line?

(1)Δl versues 1/l

(2)Δl versus l2

(3)Δl versus 1/l2

(4) Δl versus l

Subtopic:  Hooke's Law |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The following four wires are made of the same material. Which of them will have the largest extension when the same tension is applied?

(1) Length=50cm, diameter=0.5mm 

(2) Length=100cm, diameter=1mm 

(3) Length=200cm, diameter=2mm 

(4) Length=300cm, diameter=3mm 

Subtopic:  Hooke's Law |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be -

(1) 0.5 cm                             

(2) 2 cm

(3) 4 cm                                 

(4) 8 cm

Subtopic:  Hooke's Law |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


 The area of cross-section of a wire of length 1.1 metre is 1mm2.It is loaded with 1 kg. If Young's modulus of copper is 1.1×1011N/m2, then the increase in length will be (If g=10m/s2)

(1) 0.01 mm               

(2) 0.075 mm

(3) 0.1 mm                 

(4) 0.15 mm

Subtopic:  Hooke's Law |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


In CGS system, the Young's modulus of a steel wire is 2×1012 dyne/cm2 . To double the length of a wire of unit cross-section area, the force required is 

(a) 4×106dynes                     (b) 2×1012dynes

(c) 2×1012newtons                (d) 2×108dynes

Subtopic:  Hooke's Law |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The material which practically does not show elastic after effect is 

(1) Copper                         

(2) Rubber

(3) Steel                             

(4) Quartz

Subtopic:  Elasticity |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be

(1) F/2                                     

(2) 2F 

(3) 4F                                       (4) F/4

Subtopic:  Stress - Strain |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The relationship between Young's modulus Y, Bulk modulus K and modulus of rigidity n is

(1) Y=9nKn+3K                                    

(2) 9YKY+3K 

(3)  Y=9nK3+K                                     

(4) Y=3nK9n+K         

Subtopic:  Elasticity |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The Young's modulus of a rubber string 8 cm long and density 1.5 kg/m3 is 5×108 N/m2, is suspended on the ceiling in a room. The increase in length due to its own weight will be

(1) 9.6×10-5 m                           

(2) 9.6×10-11m

(3) 9.6×10-3 m                           

(4) 9.6 m

Subtopic:  Stress - Strain |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


A and B are two wires of same material. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is

(1) Equal to that on A                 (2) Four times that on A

(3) Two times that on A               

(4) Half that on A

Subtopic:  Stress - Strain |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level: