EASY
8th CBSE
IMPORTANT
Earn 100
Refer to figure and express the thickness of the inner core as a percentage of the total distance between the surface and interior most point of the earth.
Important Questions on Enrichment Activities (Based on Chapters 13–19)
EASY
8th CBSE
IMPORTANT
Study the figure and determine the ratio of nitrogen and oxygen present in the air.
EASY
8th CBSE
IMPORTANT
How much copper must be mixed with of zinc in order to make an alloy of which is zinc and the rest is copper.
MEDIUM
8th CBSE
IMPORTANT
A shopkeeper makes offers on various items to increase sales:
Toothpaste (MP = ) + Free toothbrush worth ;
(b) One pen (MP ) + Free pen;
(c) Watch (MP = ) + Free pen worth .
If the shopkeeper paid for the toothpaste, for the pen and for the watch, then in which case is the gain per cent maximum?
HARD
8th CBSE
IMPORTANT
A shopkeeper makes offers on various items to increase sales:
Toothpaste (MP = ) + Free toothbrush worth ;
(b) One pen (MP ) + Free pen;
(c) Watch (MP = ) + Free pen worth .
If the shopkeeper paid for the toothpaste, for the pen and for the watch, then if you were the shopkeeper and had to do away with one offer out of the three, which two offers would you choose to keep and why?
MEDIUM
8th CBSE
IMPORTANT
The profit earned on selling a fan for is the same as the loss on selling it for . What is the cost price of the fan?
HARD
8th CBSE
IMPORTANT
A sum of money lent on Cl amounts to in years. If it amounts to in years, find the rate of interest.
MEDIUM
8th CBSE
IMPORTANT
If amounts to in years at compound interest at a certain rate, then how much will amount to in years at the same rate?
MEDIUM
8th CBSE
IMPORTANT
The cost of a microwave oven is . Its value depreciates at the rate of per annum. Find its value at the end of years.
