6. Which of the following physical quantity is fundamental ?
(a) viscosity
(b) velocity
(c) force
(d) time
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
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
(d) all of the above.
9. The intensity of the electric field has the unit :
(a) newton/coulomb
(b) newton/ampere
(c) ampere/newton
(d) none of these
10. What is the dimension of the physical quantity α in the equation,
P = density/α,
where P is the pressure ?
(a) M L 2 T –1
(b) M L 4 T –2
(c) L –2 T 2
(d) M L –2 T 2
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