A question bank has questions of Physics and Chemistry. The number of questions of Chemistry are 3.5 times the number of questions of Physics. If there are 90 questions in the question , bank find the number of questions of Physics and Chemistry in the question bank .
The velocity time graph of a particle moving along a straight line is shown in the figure. In the time interval from t=0 to t=8 second, answer the following three question. The distance travelled by the particle is :
In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.
In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.
If the sum of the squares of the distance of a point from the three coordinate axes is 36, then find its distance from the origin.
Find the equation of ellipse whose distance between foci is 8 units and distance between the directrices is 18 units.
The graph showing correctly the variation of image distance (v) as a function of object distance (u) in case of a concave mirror is
In a spherical region the densiy varies inversely with the distance from ther centre Gravitational field at a distance r from the centre is .
