EASY
9th CBSE
IMPORTANT
Earn 100
Give reason why branches of a tree move and bend freely in high wind velocity.
Important Questions on Sample Question Paper
MEDIUM
9th CBSE
IMPORTANT
A motorcyclist drives from point A to point B with a uniform speed of and returns back to point A with a uniform speed of . Find the average speed of the motorcyclist.
MEDIUM
9th CBSE
IMPORTANT
Velocity versus time graph of a ball of mass rolling on a concrete floor is shown below. Calculate the acceleration and the frictional force of the floor on the ball.
MEDIUM
9th CBSE
IMPORTANT
The volume of a sealed packet is . Will the packet float or sink in a saturated salt solution, if the density of the solution is ? What will be the mass of the solution displaced by this packet?
MEDIUM
9th CBSE
IMPORTANT
Why step farming is common in hills?
EASY
9th CBSE
IMPORTANT
Fertile soil has lots of humus. Why?
MEDIUM
9th CBSE
IMPORTANT
List out some useful traits in improved crop.
MEDIUM
9th CBSE
IMPORTANT
Arrange these statements in correct sequence of preparation of green manure.
(a) Green plants are decomposed in soil.
(b) Green plants are cultivated for preparing manure or crop plant parts are used.
(c) Plants are ploughed and mixed into the soil.
(d) After decomposition it becomes green manure.
MEDIUM
9th CBSE
IMPORTANT
An Italian bee variety Apis mellifera has been introduced in India for honey production. Write about its merits on other varieties.
