45 oC = ____ F.
In a simple pendulum, a small metallic ball suspended from a rigid support, by a thread is called the bob of the pendulum.
CFL is also used instead of fuses in household electric circuits.
Ram is observing his image in a plane mirror. If the distance between his image and the mirror is 4 m, then the distance between him and his image is ____ m.
When a yellow stain of turmeric on a white cloth is rubbed with a soap solution, the colour of the stain changes to ____.
When an iron nail is placed in a copper sulphate solution, then the copper sulphate solution turns from blue to green, which is due to the formation of ____.
A) iron oxide
B) copper oxide
C) iron sulphate
The first step in finding the mean temperature for a given month is to find the ____ temperatures recorded during the month.
A) product of the
B) sum of the
C) average of the
D) sum of the highest and lowest
The process of wastewater treatment is commonly known as ____.
A) sewage treatment
B) water harvesting
____ helps in maintaining the supply of nutrients to the growing plants in the forests.
B) Rain water
The steps involved in getting clarified water from waste water are listed as follows: (i) Floatable solids like oils are removed by the skimmer. (ii) Filtration. (iii) Removal of large objects through bar screens, then grit and sand is removed.
(iv) Removal of solids like faeces by a scraper is done, and then air is pumped. (v) Chemicals are used to disinfect the water. The correct sequence of steps to get clarified water is ____.
A) (iii), (iv) and (i)
B) (ii), (iii) and (v)
C) (iv), (iii) and (i)
D) (v), (ii) and (v)