The length of an elastic string is 'a' metre when the longitudinal tension is 4 N and 'b' metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N will be:

1. a - b                                             

2. 5b - 4a

3. 2b -14a                                       

4. 4a - 3b

Subtopic:  Hooke's Law |
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Hooke's law is applicable for:

1. Elastic materials only

2. Plastic materials only

3. Elastomers only

4. All of these

Subtopic:  Hooke's Law |
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Two wires of copper having length in the ratio of 4: 1 and radii ratio of 1: 4 are stretched by the same force. The ratio of longitudinal strain in the two will be:
1. 1: 16                                             
2. 16: 1
3. 1: 64                                             
4. 64: 1

Subtopic:  Hooke's Law |
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The length of elastic string, obeying Hooke's law is l1 metres when the tension is 4N, and l2 metres when the tension is 5N. The length in metres when the tension is 0N will be-

1. 5l1-4l2                                

2. 5l2-4l1

3. 9l1-8l2

4. 9l2-8l1

Subtopic:  Hooke's Law |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology