**Q1) A student measured the diameter of a wire using a screw gauge with least count 0.001 cm and listed the measurements. The correct measurement is _ **

**a) **5.3 cm

**b) **5.32 cm

**c) **5.320 cm

**d) **5.3200 cm

**Q2) The density of a material in CGS system of units is 4g/cm square . In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be :-**

**a) **0.04

**b) **0.4

**c) **40

**d) **400

**Q3) Which of the following does not have the same unit as others?**

**a) **watt-s

**b) **kilowatt-hour

**c) **eV

**d) **J-s

**Q4) Which of the following system of units is not based on units of mass, length and time along ?**

**a) **SI

**b) **MKS

**c) **FPS

**d) **CGS

**Q5) The ratio of one micron to one nanometre is:**

**a) **10 to the power (3)

**b) **10 to the power (-3)

**c) **10 to the power (-6)

**d) **10 to the power (-1)

**Q6) Temperature can be expressed as a derived quantity in terms of which of the following ?**

**a) **Length and mass

**b) **Mass and time

**c) **Length. mass and time

**d) **None of these

**Q7) Density of wood is 0.5 gm/cc in CGS system of units. The corresponding value in MKS units is :**

**a) **500

**b) **5

**c) **0.5

**d) **5000

**Q8) Which of the following is smallest unit :**

**a) **Millimetre

**b) **Angstrom

**c) **Fermi

**d) **Metre

**Q9) 'Parsec' is the unit of -**

**a) **time

**b) **distance

**c) **frequency

**d) **angular acceleration

**Q10) The ratio of the dimensions of Planck's constant and that of the moment of inertia is :-**

**a) **Velocity

**b) **Angular momentum

**c) **Time

**d) **Frequency

**Q11) In a particular system the units of length mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equal to :**

**a) **0.1 N

**b) **1 N

**c) **10 N

**d) **100 N

**Q12) Discuss Supplementary units In SI system? **

**Q13) Give two examples of practical units used in physics? **

**ANSWERS **

**1) C**

**2) C**

**3) d**

**4) a**

**5) a**

**6) d**

**7) a**

**8) c**

**9) b**

**10) d**

**11) a**

**12) Radian (rad) for plane angle and steradian (sr) for solid angle.**

**Radian : 1 radian is the angle subtended at the centre of a circle by an arc equal in length to the radius of the circle.**

**Steradian : steradian is the solid angle subtended at the centre of a sphere, by that surface of the sphere which is equal in area to the square of the radius of the sphere.**

**13) light year (ly) is a practical unit of distance.**

**horse power (hp) is a practical unit of power.**