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# Units and Dimensions – 1 – 2

6. Which of the following physical quantity is fundamental ?

(a) viscosity
(b) velocity
(c) force
(d) time

Explanation
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7. If the wavelength of the green line of the visible spectrum is 546 nm, its value in metre is :

(a) 546 × 10–10
(b) 546 × 10–19
(c) 54.6 × 10–8
(d) 54.6 × 109

Explanation
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8. Which one of the following has not been expressed in proper units ?

(a) power : kg m2 s–3
(b) pressure : kg m–2 s–2
(c) momentum : kg m s–1
(c) all of the above.

Explanation
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9. The intensity of the electric field has the unit :

(a) newton/coulomb
(b) newton/ampere
(c) ampere/newton
(d) none of these

Explanation
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10. What is the dimension of the physical quantity α in the equation,

P = density/α,

where P is the pressure ?

(a) M L –1
(b) M L –2
(c) L –2 2
(d) M L –2 2