## Units and Measurement Questions and Answers Part-8

1. Which relation is wrong
a) 1 Calorie = 4.18 Joules
b) $1\dot{A}=10^{-10}m$
c) $1MeV=1.6\times 10^{-13}Joules$
d) $1Newton=10^{-5}Dynes$

Explanation: 1 Newton = 105 Dyne

2. If $x=at+bt^{2}$ , where x is the distance travelled by the body in kilometres while t is the time in seconds, then the units of b are
a) $Km\diagup s$
b) $Km- s$
c) $Km\diagup s^{2}$
d) $Km- s^{2}$

Explanation:

3. Which of the following quantity is expressed as force per unit area
a) Work
b) Pressure
c) Volume
d) Area

Explanation: Pressure

4. Unit of impulse is
a) Newton
b) $kg-m$
c) $kg-m\diagup s$
d) Joule

Explanation: Impulse = Force * time = (kg-m/s2) *s = kg-m/s

5. Which is not a unit of electric field
a) $NC^{-1}$
b) $Vm^{-1}$
c) $JC^{-1}$
d) $JC^{-1}m^{-1}$

Explanation: $JC^{-1}$

6. The correct value of $0^{\circ}C$ on the Kelvin scale is
a) 273.15 K
b) 272.85 K
c) 273 K
d) 273.2 K

Explanation: K = C + 273.15

7. 'Torr' is the unit of
a) Pressure
b) Volume
c) Density
d) Flux

Explanation: 'Torr' is the unit of Pressure

8. Which of the following is a derived unit
a) Unit of mass
b) Unit of length
c) Unit of time
d) Unit of volume

Explanation: Unit of volume

9. $Dyne\diagup cm^{2}$   is not a unit of
a) Pressure
b) Stress
c) Strain
d) Young's modulus

a) $kg-m^{2}\diagup s^{2}$
b) $Joule-s$
c) $Joule\diagup s$
d) $kg-m- s^{2}$
Explanation: $Joule-s$