A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?

Related Mcqs:

1. A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?

   A. 0.025J
   B. 0.50J
   C. 0.75J
   D. 0.100J

2. When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?

   A. Y∝
   B. 2Y∝
   C. Y∝/2
   D. Y∝2

3. The ration stress to strain in youngs modulus of the material then tension is__________________?

   A. Directly proportional to extension
   B. Directly proportional to strain
   C. Directly proportional to square of amplitude
   D. Inversely proportional to extension

4. A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?

   A. FE
   B. (FE)
   C. FE2/L
   D. FE2

5. Which of the following can not be the resultant of two vectors having magnitude 10N and 15N?

   A. 18N
   B. 22N
   C. 25N
   D. 30N

   Submitted by: Zahid Jagirani

6. A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?

   A. f2 + f1
   B. f2 – f1
   C. f1f2/f2+f1
   D. f1f2/f1-f2

7. A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2

   A. 22N
   B. 16N
   C. 20N
   D. 4N

   Submitted by: Huzaifa Naseer

8. A force applied on a body through the string is called_________?

   A. Weight
   B. Momentum
   C. Tension
   D. Torque

   Submitted by: hamza khan

9. Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is

   A. 0.125 J
   B. 0.250 J
   C. 0.50 J
   D. 1 J

   Submitted by: Huzaifa Naseer

10. A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________?

    A. remains the same
    B. is doubled
    C. is halved
    D. becomes zero