2020 MHT-CET PCB SET - 03 — MHT - CET STD 12 Science — Question

In a series of observations, S.D. = 5 and mean is 20, then coefficient of variation is ______.

Which of the following quantified statement is True?

An `alpha` - particle of energy 5 MeV is scattered through 180° by gold nucleus. The distance of closest approach is of the order of ______.

Which of the following is CORRECT about alkynes?

A stretched wire of length 260 cm is set into vibrations. It is divided into three segments whose frequencies are in the ratio 2 : 3 : 4. Their lengths must be ______.

Haloarenes are less reactive than alkyl halides towards nucleophilic substitution because ____________ in aryl halide.

In the formation of an aldol, α-carbon atom of one aldehyde molecule attaches to ____________ of another aldehyde molecule.

A metal sphere is hanging from the ceiling of a vehicle. If the vehicle is moving along the horizontal road with uniform acceleration 'a' then the suspended thread of the sphere gets inclined to the vertical at an angle 'θ'. The value of acceleration 'a' is (g = acceleration due to gravity) ______.

In photoelectric effect, for a light of different intensities but of same frequency, the stopping potential for a given metal is ____________.