A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is
The maximum and minimum magnitudes of the resultant of two given vectors are 17 units and 7 units respectively.If these two vectors are at right angles to each other.the magnitude of their resultant is
The value of acceleration due to gravity on the surface of the earth is g.If the diameter of the earth becomes double of its present value and its mass remains unchanged, the value of acceleration due to gravity on the surface of the earth would become
The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart,with force of repulsion between the spheres to be 10-19 N,is
A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h.The average speed of the car is
A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope
H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:
The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming
When equal proportion of DH3_ l and C2H5 ___ l are treated with Na metal in preasence4 of dry ether, the number of possible hydrocarbons obtained will be:
Lipids are naturally occurring compounds produced in cell and are water insoluble but soluble in organic solvent one of the following is not a lipid, Select among the following:
PCI5 (g) <---------> PCl3 (g) +Cl2 (g) in a closed container at equilibrium. At a fixed temperature, what will be the effect of adding more PCl5 on the equilibrium constant
