In a bag, the ratio of red balls to green balls is 4:9. If 7 more red balls are added to the bag, the ratio of red balls to green balls will become 5:6. How many green balls are there in the bag?

If the distance travelled by an object is zero, then the displacement of the object

If 'U' is the husband of 'V', 'V' and 'W' are daughters of 'X', 'Y' is the husband of 'X', then 'Y' is the ____ of 'U'.

A lens has a power +2.0 D. The type of lens and its focal length will be

What will be the resistance of a wire across which, when 2V potential difference is applied, 1A current flows through the wire?

Name the noble gas which is placed in the third period and eighth group of the Modern Periodic table.

If an object is placed at the center of curvature of a concave mirror, then the image formed will be

What is the type of Energy possessed by a stretched rubber band?