Atomic number of aluminium is 13 and its mass numbers is 27. Radius of Aluminium is \(R_{0}=1.4\times10^{-15}m\)
(A) \(0.42\times10^{-15}m\)
(B)\(42\times10^{-15}\)m
(C) \(4.2\times10^{-15}\)m
(D)\(4.2\times10^{-10}\)m

2Litres of an aqueous solution is prepared containing initially 10^(-3) moles of MgCl_(2) and 10^(-3) moles of "NaF" .Find concentration of F^(-) ions in the solution at equlibrium. Given : Ksp [MgF_(2)] = 4times10^(-11) (A) 2times10^(-4)M (B) 4times10^(-4)M (C) 5times10^(-4)M (D) 8times10^(-4)M

A ball of mass "100g" is moving with "100m/sec" . The wavelength is (A) 6.625times10^(-28)m (B) 6.625times10^(-35)m (C) 6.625times10^(-30)m (D) 6.625times10^(-24)m

the amplitude of simple pendulum is 4times10^(-2)m .The KE and PE will equal at a distance from the equilibrium position of (A) 1times10^(-2)m (B) 2times10^(-2)m (C) 2sqrt(2)times10^(-2)m (D) sqrt(2)times10^(-2)m

Simplify: 10^(-1)times10^(2)times10^(-3)times10^(4)times10^(-5)times10^(6)

There are 10 turns in coil M and 15 turns in coil N .If a current of 2A is passed through coil M then the flux linked with coil N is 1.8times10^(-3)Wb .If a current of 3A is passed through coil N then flux linked with coil M is : (A) 1.2times10^(-3)Wb (B) 2.7times10^(-3)Wb (C) 1.8times10^(-3)Wb (D) 4.05times10^(-3)Wb

[" 8.The dielectric strength of the air is about "-],[[" (A) "3times10^(6)v/m" (B) "3times10^(4)v/m],[" (C) "3times10^(2)v/m," (D) "3times10^(3)v/m]]

The desity of a nucleus in which mass of each nucleon is 1.67xx10^(-27)kg and R_(0)=1.4xx10^(-15)m is

(b) Conductivity of \(2\times10^{-3}\) M methanoic acid is \(8\times10^{-5}Scm^{-1}\) Calculate its molar conductivity.

The OH^- concentration of a solution is 1.0 xx 10^(-10) M. The solution is

A hydrogen atom a photon corresponding to an electron transition from n=5 to n=1 .The recoil speed of hydrogen atom is almost (mass of proton 1.6times10^(-27)kg) (A) 10m/s (B) 2times10^(-2)m/s (C) 4m/s