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 ?

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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...