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CBSE->Std 8 Questions

Total Questions 1510
where is answers for exercise questions mentioned please reply
Complete the reaction and explain. (a)ZnSO4+Cu-? (b)CuSO4+Cu-?
Is iron more reactive than copper?write an activity to prove your statement.
What happens when (a)Magnesium is treated with dilute HCl (b)copper is treated with dilute HCl show the relevant equation
Why food stuffs with acid components should not be stored in a metallic container
Two persons are applying forces on two opposite sides of a moving cart.The cart still moves with the same speed in the same direction.What do you infer about the magnitudes and direction of the forces applied?
if a pressure of 80Pa is applied on an area of 200cm^2 calculate the force applied on it
who is the father of chemistry?
7/11 of all the money in Hamid's bank account is Rs.77,000.How much money does Hamid have in his bank account ?
A train travels 1445/2 km in 17/2 hours.Find the speed of the train in km/h
3/7+(-2/21)*(-5/6)
simplify: 32/5+23/11*22/15
use distributivity of multiplication of rational numbers over addition to simplify (-5/4)*[8/5+16/5]
using suitable rearrangement and find the sum (-5)+7/10+3/7+(-3)+5/14+(-4)/5
what is meant by metallic resources
verify that -(-x)=x for x=11/15 and x=-13/17
verify that -(-x)=x for x=11/15 using L.H.S and R.H.S
why oxygen is called as a gas?
In a right angled triangle,PQR,angle Q=90 degree if a)PQ=9 cm;QR=40cm and find PR b)PR=37cm;PQ=12cm,find QR
Find the least square number exactly divisible by each of the number:7,16,21.