A projectle is fired horizontally from an inclined plane (of inclination 30° with horizontal) with speed = 50 m/s. If , range of the projectile measured along the incline is

The two points A and B in a plane are such that for all points P lies on circle satisfied  , then k will not be equal to

So here we have given the two points A and B in a plane are such that for all points P lies on circle satisfied . We can also use equation of circle to find the answer. So here the correct option is none of these.

A circle touches the x-axis and also touches the circle with centre at (0, 3) and radius. The locus of the centre of the circle is

So here we have given to find the locus is in which form. We used the concept of circles and solved the question. We can also use equation of circle to find the answer. So the locus is x²-10y+5=0, this is the representation of parabola, so correct answer is parabola. 

If d is the distance between the centres of two circles,  are their radii and , then

For such questions, we have to see how the cricles are with respect to each other to find the distance between the centers.

Assertion (A): The curve touches the x-axis.
Reason(R): touches the x-axis if

Assertion (A): When a>0 and has complex roots.
Reason(R): The graph of cuts x-axis.

In an ellipse , the distance between the foci is

If , , and , then equals

Arrange the following in decreasing order of their solubility in water

Which have maximum solubility in water, for nearly same molecular weight compounds

The correct order of solubility in water is :
a) CH₃OH
b) CH₃CH₂OH
c) 
d) 

Decreasing order of melting point of compound I - IV follows :

Decreasing order of melting point of compound I to IV follows

Which order is correct regarding melting point ?

Decreasing order of boiling point of I to IV follow

The correct boiling point order is :