1. Choose the correct alternative (MCQ) :
i) The dimensional formula of force is
a) [MºLT⁻¹] b) [MLT⁻²] c) [ML²T⁻²] d) [ML⁻¹T⁻²]
ii) What is the momentum of an object of mass m moving with velocity v ?
a) (mv)² b) mv² c) 1/2 mv² d) mv
iii) Which one of the following substance has the greatest viscosity ?
a) Water b) mercury c) oxygen iv) hydrogen
iv) Soap or detergent is an example of
a) Emulsifier b) sol c) aerosol d) solid foam
v) 16 a.m.u is the mass of
a) one oxygen atom b) one oxygen molecule c) one mole of oxygen d) one mole of oxygen atom
vi) The concept of nucleus of an atom was given by
a) J. J. Thomson b) Niels Borh iii) Rutherford iv) M. Curie
vii) Fractional distillation is used for separation of mixture
i) solid in liquid mixture ii) liquid in mixture iii) liquid-liquid immiscible iv) liquid-liquid miscible
viii) Acid turns blue litmus paper to
a) red b) deep violet c) green d) colorless
ix) Which one is a basic salt ?
a) Na₂SO₄ b) Na₂HPO₄ c) NaCl d) Pb(OH)Cl
x) The rate of doing work is called
a) Velocity b) energy c) power d) force
xi) Due to special behavior of water , lakes and pond freezes
a) first at the bottom b) first in the middle c) first at their surface d) anywhere
xii) Loudness of sound can be expressed in
a) Hz b) db c) m d) m/s
xiii) Temporary hardness is due to the presence of which compound in water ?
a) Na Cl b) CaSO₄ c) NaNO₃ d) Ca(HCO₃)₂
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