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A mother of blood group O has a group O child. What could be the blood group of father of the child?
In the absence of ozone layer, which rays will enter into atmosphere
Plant development is influenced by
The equipment SONAR is used to determine the
The variety of coal in which the deposit contains recognizable traces of the original plant material is
Which among the given is a chemical change?
Which of the following one of the following is used to restore the colour of old oil paintings
A motor can round a curves at 30 km/hr. If it round the curve at 60 km/hr, the car’s tendency to topple of earth :
Diamond is hard because
In the atmosphere ultraviolet rays are absorbed by
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