Arithmetic of Numbers in Scientific Notation

Q. The mass of an armored tank is $6\times {10}^4\text{kg}$ and of an armored car is $4\times {10}^3\text{kg}.$ What is the combined weight of both the vehicles?

1. 64000

Q.

$(9\times {10}^{-2})+(9\times {10}^3)$ in usual form is given by

1. 9000.09

2. 900.9
3. 900.09
4. 9000.9

Q. Find the value of $(2\times {10}^4)+(5\times {10}^3)+(4\times {10}^2)+(3\times {10}^1)+(6\times {10}^0)+(7\times {10}^{-1})+(8\times {10}^{-2})+(9\times {10}^{-3})$

1. 2543.789
2. 2543.6789
3. 25436.789
4. 2543.6789

Q. Superman flies at a speed of $2.6\times {10}^7$ m/s . If the speed of a jet is 130000 m/s, then Superman's speed is times the speed of the jet.

1. 200
2. 2000
3. 240
4. 2400

Q.

The distance between Earth and Mars is 2.2253x${10}^8$ kms. The distance between Mars and Saturn is $1.19666\times {10}^9$ kms. A spaceship starts from Earth and travels to Saturn via Mars. Find the total distance covered by the spaceship in metres.

1. 1.41919x${10}^{12}$ m

2. 14191900000 m
3. 1419190000000 m
4. 1.41919x${10}^9$ m

Q. The mass of an armored tank is $6\times {10}^4\text{kg}$ and of an armored car is $4\times {10}^3\text{kg}.$ What is the combined weight of both the vehicles?

1. ${10}^5\text{kg}$
2. $6.4\times {10}^5\text{kg}$
3. $6.4\times {10}^4\text{kg}$
4. $4.6\times {10}^4\text{kg}$