# Decimal Numbers Quiz Set 006

### Question 1

14687 is same as?

A

\$1.4687 × 10^{4}\$.

B

\$1.4687 × 10^{3}\$.

C

\$1.4687 × 10^{5}\$.

D

\$1.4687 × 10^{2}\$.

Soln.
Ans: a

### Question 2

What is y in \$1.74 + 0.1 + y = 0.05\$?

A

-1.79.

B

1.5.

C

0.15.

D

0.015.

Soln.
Ans: a

y = 0.05 - (0.1 + 1.74) = -1.79.

### Question 3

What is x in \${374/0.0374} = {3.74/x}\$?

A

\$3.74 × 10^{-4}\$.

B

\$3.74 × 10^{-3}\$.

C

\$3.74 × 10^{-5}\$.

D

\$3.74 × 10^{-2}\$.

Soln.
Ans: a
Transposing, x = \$3.74 × {0.0374/374}\$ which gives 0.000374, which, in scientific form is \$3.74 × 10^{-4}\$.

### Question 4

What is \$3.911 + 0.1 + 0.05\$?

A

4.061.

B

3.996.

C

3.975.

D

4.050.

Soln.
Ans: a

By simple addition we get \$3.911 + 0.1 + 0.05 = 4.061\$.

### Question 5

For what value of x would this expression be a perfect square: \$8.88 × 8.88 - x × 8.88 + 0.5 × 0.5\$?

A

1.

B

0.1.

C

0.001.

D

0.01.

Soln.
Ans: a

Comparing the given expression with \$a^2 - 2 × a ×b + b^2 = (a - b)^2\$, we see that if a = 8.88, and b = 0.5 then by inspection, x should be equal to 2b = 2 × 0.5 = 1. 