When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?
(A) 0.33 nm
(B) 0.34 nm
(C) 0.35 nm
(D) 0.36 nm
Which of the following properties prove that cathode rays are material in nature_________________?
(A) they cast shadow
(B) they possess momentum
(C) they are negatively charged
(D) all of the above
Paramagnetic behaviour of substance is measured by a balance called___________________?
(A) Analytical balance
(B) Guoys balance
(C) Electrical balance
(D) Single beam balance
Metallic crystals are soluble in________________?
(A) Polar solvent
(B) Non polar solvent
(C) Fused metal
(D) None
Which of the following solids show anisotropy___________________?
(A) Plastic
(B) Glass
(C) Rubber
(D) None of the above
The rectified spirit is________________?
(A) 12% alcohol
(B) 90% alcohol
(C) 95% alcohol
(D) 100% alcohol
As a substance moves from a solid to a liquid all of the following changes occur except ?
(A) molecules become more disordered.
(B) K.E of the molecules decreases
(C) intermolecular forces become weaker.
(D) molecules move more frequently.
Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?
(A) 20cm3/min
(B) 40cm3/min
(C) 160cm3/min
(D) 2.5cm3/min
Methyl alcohol is not used as___________________?
(A) a solvent
(B) an anti freezing agent
(C) a substitute for petrol
(D) for denaturing of ethyl alcohol