Ask a Teacher


Questions

Total Questions 18111
List two criteria of measuring the biodiversity of an area.
What is a cellophane?
The linear magnification produced by a spherical mirror is –1. Analysing this value state the (i) type of mirror and (ii) position of the object with respect to the pole of the mirror. Draw ray diagram to justify your answer
Why do mice whose tails were surgically removed just after birth for generations, continue to produce mice with tails ?
Out of the three elements P, Q and R having atomic numbers 11, 17 and 19 respectively which two elements will show similar properties and why ?
what are noble gases ?
what is annual range of temperature?
ABCD is a trapezium in which AB parallel to DC, DC=30cm and AB=50cm, if X and Y are respectively the mid points of AD and BC, prove that ar[DCYX]= 7/9ar[XYBA].
what principle of science behind the take off of aeroplane from the ground?
Why rainbow is seen in arc shape?
WHAT IS MEANT BY SCATTERING?
Find the correct pair and write in a table of three column.(match the following properly) (1)current-number of cycles formed in 1 second-volt (2)frequency-reciprocal of the focal lenght-hertz (3)power of the a lens-amount of charge flowing in 1 second-ampere (4)_ -distance travelled by a wave in 1 second-dioptre
(1)Which velocity-time graph represent a body sarting from rest? (2)Which velocity-time graph represent negative acceleration of a body?
A body of mass 2kg is moving with a uniform velocity 3m/s. (a)what is the kinetic energy of the body? (b)if the body has 50J potential energy what is the mechanical energy of the body?
clear image of an object at different distances can be formed on the retina of our eye or film in the camera. (a)how does the eye achive this ability? (b)in which name is this ability of the eye known?
The magnetic needle deflects when the circuit is switched on.suggest 2 ways to make the deflection of the needle in the opposite direction(the magnetic needle was straight then it turned in such a way that the north pole is in the left hand side and the south pole is in the right hand side)
Can you explain the reproduction in plants?
What is the difference between fraternal twins and identical twins?Can you explain with pictures?
When sulphuric acid is added to sugar it turns black what is the reason?
What is the secret of bermuda triangle?can you expain with pictures?