Class 8 - Mathematics मॉक टेस्ट

If f: R → R is defined by f(x) = 2x + 1 and g: R → R is defined by g(x) = x², then (g ∘ f)(x) equals:

If a⃗ = 2î − ĵ + 3k̂ and b⃗ = î + 2ĵ − k̂, find a⃗ · b⃗.

A man standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank is 60°. When he moves 40 m away from the bank, the angle of elevation becomes 30°. Find the width of the river.

The mean of the first 5 natural numbers is:

The solution of the homogeneous differential equation dy/dx = (x + y)/x is:

The approximate value of (26.99)^(1/3) using differentials is (given (27)^(1/3) = 3):

Find the missing number: 3, 9, 27, 81, ?

In a pie chart, if 25% of the data represents students who prefer maths, what is the central angle?