Which of the following is not a unit of length?

Related Mcqs:

1. 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

2. 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

3. 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 ?

   A. 2×108 Nm-2
   B. 5×106 Nm-2
   C. 0.5×10-6 Nm-2
   D. 0.2×10-6Nm-2

4. A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?

   A. (F1+F2) (121+122)
   B. (F1+F2) (122-112)
   C. (F1+F2) (12-11)
   D. (F1+F2) (12-11)

5. Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?

   A. zero
   B. focus
   C. 2 f
   D. f/2

6. Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?

   A. magnetic flux
   B. magnetic field intensity
   C. magnetic induction
   D. self inductance

7. Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?

   A. Stiffness
   B. Toughness
   C. Extension
   D. Deformation

8. The number of significant figures in the length of a bar 6200mm measured by meter rod is_______________?

   A. 4
   B. 3
   C. 2
   D. None of these

9. The length of the second pendulum is_________________?

   A. 100 cm
   B. 99 cm
   C. 99.2 cm
   D. 98 cm

10. An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is________________?

    A. greater than one meter
    B. less than one meter
    C. one meter
    D. a foolish question