The atmospheric air is held to the Earth by
The function of ball bearings in a wheel is
'Shock-absorbers' are usually made of steel as it
Saliva helps in the digestion of
The longest bone in the human body is
Red data book gives information about species which are
The time period of a pendulum when taken to the Moon would
Which of the following could be used as fuel in propellant or rockets?
The addition of gypsum to Portland cement helps in
White lung disease is prevalent among the workers of
Iodoform is used as an
An artificial ecosystem is represented by
- pisciculture tank
- agricultural land
- zoo
- aquarium
The constituents of automobile exhaust that can cause cancer is
The optimum diss0olved oxygen level (in mg/litre) required for survival of aquatic organisms is
Normal fasting blood sugar level per 100 ml of blood in man is
The vector of disease sleeping sickness is
Among the following materials sound travels fastest in
Hard steel contains
Cement is formed by strongly heating a mixture of
Glass is
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