meelsay 78

The unit watt is the same as …… .

1. The unit one joule per second is equivalent to ……… .
2. The mechanical advantage of a machine depends on the ………. present.
3. Mechanical advantage is the ratio of the …… to the effort.
4. The velocity ratio is usually much greater than ………. .
5. If a machine is …….. the mechanical advantage will be equal to the velocity ratio.
   26.The ability to retain the original form is called ……… .
6. The ratio of the stress to the strain is ……… .
   . The cost of 40 pens is k. 360 and the cost of 30 pencils is k. 90. The ratio of the cost of a
   pen to that of a pencil is
   A. 1:3 B. 1:4 C. 3:1 D. 4:1 E. 16:3
7. The ratio of the area of a circle of radius 7 cm to the area of a circle of radius 14 cm is
   A. 1:2 B. 2:3 C. 3:5 D. 4:9 E. 1:4
8. If the ratio of the areas of two circles is 49:25 , then the ratio of the diameters of these
   circles is
   A. 3:4 B. 4:5 C. 7:5 D. 6:5 E. 1:4
9. If x is 2/3 of y and y is 3/4 of z , then the ratio of z to x is
   A. 2:1 B. 1:1 C. 3:2 D. 1:2 E. 4:3
10. If 2x2 -5xy + 3y2=0, then x:y=……….
    A. 2:5 B. 5:3 C. 1:1 D. 1:1 (or) 2:3 E. 3:2 (or) 1:1
11. If xy = x + y, where x and y are real numbers, then y cannot be
    A.0 B.1 C. -1 D.2 E. -2
12. If 3a = 4b = 5c, then 1/a:1/b:1/c =…………
    A. 1/3:1/4:1/5 B.1/5 :1/4: 1/3 C. 1/4:1/5:1/3 D. 3:4:5 E.5:4:3