Electric current is a ______quantity

(a)

base

(b)

supplementary

(c)

derived

(d)

professional

Amount of substance is

(a)

directly proportional to the number of atoms

(b)

inversely proportional to the number of atoms

(c)

directly proportional to the square of number of atoms

(d)

inversely proportional to the square of number of atoms

Which one of the following devices is used to measure electric current

(a)

(b)

(c)

(d)

Closeness of two or more measured values is called as ______

(a)

accuracy

(b)

precision

(c)

error

(d)

approximation

Which of the following statements  is wrong?

(a)

Approximation gives accurate value

(b)

Approximation simplifies the calculation

(c)

Approximation is very useful when little information is available

(d)

Approximation gives the nearest value only